• Revista Venezolana de Salud Publica (2020). http://revistas.ucla.edu.ve/index.php/rvsp

    Abstract
    Estamos viviendo tiempo de pandemia de un virus tipo coronavirus el COVID 19, causante de una enfermedad que si bien el 80% de la población cursa como una gripe cualquiera [...]

  • A. Elías, D. Eduardo, D. Esthefany
    Revista Venezolana de Salud Publica (2020). http://revistas.ucla.edu.ve/index.php/rvsp

    Abstract
    El Doctor Oswaldo Valdivia nació en 1937 en Arequipa, Perú. En 1958 inició sus estudios en la carrera de medicina, en el primer año nació [...]

  • M. Yesenia, C. Salvador, J. Erika
    Revista Venezolana de Salud Publica (2020). http://revistas.ucla.edu.ve/index.php/rvsp

    Abstract
    This essay is based on the development of a body of argumentation of reality in agrifood and public health that underpins the agrifood model of hegemonic domination, thus [...]

  • B. Giovanna, M. Ahimara
    Revista Venezolana de Salud Publica (2020). http://revistas.ucla.edu.ve/index.php/rvsp

    Abstract
      Lifestyle Medicine (MdelEV) has gained relevance in the prevention, treatment and reversal of most chronic diseases, directly addressing its underlying causes. Based [...]

  • S. Carolina, T. Zulay
    Revista Venezolana de Salud Publica (2020). http://revistas.ucla.edu.ve/index.php/rvsp

    Abstract
    Zoonoses as the result of a process where various factors intervene and are related to epidemiological, economic and social variables, this article reviewing the was developed, [...]

  • M. Villa, J. -Jiménez, M. Villamil-Gallego,, Á. Quintero-Echeverri, C. Robledo
    SATISFACCIÓN EN LA PRESTACIÓN DE SERVICIOS DE SALUD EN ADULTOS MAYORES COLOMBIA 2018 (2020). http://revistas.ucla.edu.ve/index.php/rvsp

    Abstract
    The term active aging is relatively new and very little known, although much has been said about this in recent times. The objective of this work to review the literature [...]

  • R. Devera,, A. Soares, D. Rayarán, I. Amaya, Y. Blanco
    Revista Venezolana de Salud Publica (2020). http://revistas.ucla.edu.ve/index.php/rvsp

    Abstract
    Simultaneous presence of various enteric parasites can have important clinical, epidemiological and therapeutic implications. A retrospective study of correlational type was [...]

  • R. Vicencina, A. Jesús, B. Celis, C. Carlos, D. Nelson, D. Esthefany, E. al
    Revista Venezolana de Salud Publica (2020). http://revistas.ucla.edu.ve/index.php/rvsp

    Abstract
    Social loneliness has been shown to be closely related to the health status of the population. The present research assessed the prevalence of arterial hypertension and its [...]

  • . ðンムᄑ, H. Tabares-Ospina
    (Select a year).

  • M. Adaucio, M. Mariela.
    PREDECIR ALTERACIONES CLÍNICO–METABÓLICAS MEDIANTE EL ÍNDICE CIRCUNFERENCIA ABDOMINAL-TALLA DEPENDE DEL SITIO DE MEDICIÓN. (2020). http://revistas.ucla.edu.ve/index.php/rvsp

    Abstract
    Aim: To determine the ability of the waist to height ratio to predict two or more clinical – metabolic disorders, according to site measuring of waist circumference. [...]

  • A. Noryesca, M. Najul
    ACCIDENTES DE TRABAJO Y DISCAPACIDAD EN POLICÍAS MUNICIPALES DE IRIBARREN DEL ESTADO LARA (2020). http://revistas.ucla.edu.ve/index.php/rvsp

    Abstract
    The objective of this research was to determine the characteristics of work accidents and disability in the municipal police of Iribarren, Lara state. The study was framed [...]

  • (2011). Universitat Oberta de Catalunya, 2011

    Abstract
    Habitualmente se piensa que los fans y los trabajos hechos por fans se basan únicamente en la adoración de éstos por los textos de origen, pero esto no [...]

  • D. Brkić, P. Praks
    Journal of Marine Science and Engineering (2020). 8(8), article 555

    Abstract
    Ships for drilling need to operate in the territorial waters of many different countries which can have different technical standards and procedures. For example, the European [...]

  • Annia Quintero's personal collection (2020). 1

    Abstract
      Occicorps Cosmetics, C.A. es una empresa conformada por la Corporación  Occipital (constituido por Adriana Castellanos, Annia Quintero, Thalía [...]

  • H. Zhou, R. Turochy, D. Xu
    Collection of Research Data in Transport (2020). 2

    Abstract
    The purpose of this research is to evaluate work zone mobility using SHRP2 NDS naturalistic driving data. In this study, forward, rear-view video, and time series traces [...]

  • CLOUD TECHNOLOGY: A CATALYST FOR EFFECTIVE ENTREPRENEURSHIP EDUCATION IN NIGERIA

    . AKPANOBONG, U. AKPANOBONG
    Nigerian Journal of Business Education (2017). Alghali, M., Alwi, N. H. M., & Ismail, R. (2013). Privacy in cloud based e-Learning. The Second International Conference on Informatics Engineering & Information Science (ICIEIS2013). pp. 355-362. The Society of Digital Informationand Wireless Communication. Alghali, M., Alwi, N. H. M., and Ismail, R. (2014). Challenges and benefits of implementing cloud-based e-learning in developing countries. Proceeding of the Social Sciences Research (ICSSR-2014). pp. 9-10. Amue, G. J., Igwe, S. R. & Abiye, H. (2014). ICT entrepreneurship and small business innovation: A mechanism for sustainability. European Journal of Business and Social Sciences, 3 (6), pp. 103 -112. Retrieved May 20, 2016 from http:// www.ejbss.com/recent.aspx Armbrust, M., Fox, A., Griffith, R., Joseph, A. D., Katz, R. H., Konwinski, A. Zaharia, M. (2009, February 10). Above the clouds: A Berkeley view of cloud computing. Retrieved from http://www.eecs.berkeley.edu/Pubs/TechRpts /2009/EECS-2009- 28.html Eken, H. (2014). Cloud computing security issues and recommendations. International Journal of Intelligent Computing Research (IJICR), 5 (1/2). Ercan, T. (2010). Effective use of cloud computing in educational institutions. Procedia Social and Behavioral Sciences 2, pp. 938-942. Tadapaneni, N. R. (2017). Different Types of Cloud Service Models. Available at SSRN 3614630. Gkikas, D. (2014). The impact of cloud computing on entrepreneurship and Start-ups: case of Greece. Sweden: KTH Industrial Engineering and Management. Larry, C. K. & Best, Z. Y. (2011). The use of ICT in entrepreneurial development. Journal of Research in Entrepreneurship, 16 (6), 339-352. Hamburg, I. & Brien, E. O. (2014). Cloud computing to support e-learning and business in SMEs. International Journal for e-learning Security (IJeLS),4 (3,4). Hamburg, I., Bucksch, S. & Brien, E. O. (2015). ICT–based approaches for Entrepreneurship education. The Tenth International Conference on Internet and Web Application and Services ICIW. Marston, S., Li, Z., Bandyopadhyay, S., Zhang, J. & Ghalsasi, A. (2011). “Cloud computing – The business perspective”. Decision Support Systems, 51, pp. 176- 189. Mathew, S. (2012). Implementation of cloud computing in education – A revolution. International Journal of Computer Theory and Engineering, 4 (3). Mell, P. & Grance, T. (2011). The NIST definition of cloud computing, Recommendation of the National Institute of Standards and Technology (draft). NIST Special Publication, 800 (145), 7. Odunaike, S. A., Olugbara, O. O., & Ojo, S. O. (2012). Using cloud computing to mitigate rural e-learning sustainability and challenges. Proceedings of the World Congress on Engineering and Computer Science, 1. San Francisco, USA. Seleman, Y. E. A. (2015). Modern methods in the development of education using cloud computing applications. Global Journal of Computer Science and Technology: B Cloud and Distributed, 15 (2, 1) Staten, J., Schadler, T., Rymer, J. R. & Wang, C. (2009). Q & A : By 2011, CIOs must answer the question, “Why not run in the cloud ?” (Leaver, S. and Viglianti, A. Interviewers). Sclater, N. (2010). Cloud computing in education. Institute for Information Technologies in Education (IITE). Policy Brief. UNESCO. Retrieved August, 26, 2016 from http://iite.unesco.org/pics/publications/en/files/3214674.pdf Yadav, K. (2014). Role of cloud computing in education. International Journal of Innovative Research in Computer and Communication Engineering, 2 (2).

    Abstract
    Information technology plays a major role in organising and operating a business by any entrepreneur. Entrepreneurship involves the ability to be creative, innovative and [...]

    • 11
  • R. Lohner, K. Morgan, O. Zienkiewicz
    International Journal for Numerical Methods in Fluids (1984). Vol. 4 (11), pp. 116-120

    Abstract
    The difficulties experienced in the treatment of hyperbolic systems of equations by the finite element method (or other) spatial discretization procedures are well known. [...]

  • R. Lohner, O. Zienkiewicz
    International Journal for Numerical Methods in Engineering (1985). Vol. 21 (1), pp. 1-11

    Abstract
    ‘Dynamic’ or ‘viscous’ relaxation procedures have not gained much popularity in finite element analysis in which the direct (Gaussian elimination) [...]

  • R. Lohner, K. Morgan, J. Peraire, O. Zienkiewicz
    (1985). The Free-Lagrange Method. Lecture Notes in Physics, vol 238. Springer, Berlin, Heidelberg

    Abstract
    The current status of CFD with regard to unstructured grids employing finite element methods and Eulerian frames is reviewed. Algorithms suitable for the computation of large [...]

  • R. Lohner, K. Morgan, J. Peraire
    Communications in numerical methods in engineering (1985). Vol. 1 (4), pp. 141-147

    Abstract
    An artificial viscosity suitable for use in the simulation of multidimensional high-speed compressible flows by the finite element method is proposed. The form adopted is [...]

  • R. Lohner, K. Morgan, O. Zienkiewicz
    Computer Methods in Applied Mechanics and Engineering (1985). Vol. 51 (1-3), pp. 441-465

    Abstract
    A two-step explicit finite element procedure for obtaining time-accurate solutions to the compressible Euler equations is described. The method is coupled with an adaptive [...]

  • R. Lohner, K. Morgan, O. Zienkiewicz
    (1986). The Efficient Use of Vector Computers with Emphasis on Computational Fluid Dynamics. Notes on Numerical Fluid Mechanics, vol 12. Vieweg+Teubner Verlag, Wiesbaden

    Abstract
    The effective programming of Finite Element Methods for CFD on vector-machines is discussed. It is shown, that for unstructured grids the performance observed on this class [...]

  • R. Lohner, K. Morgan
    International Journal for Numerical Methods in Engineering (1987). Vol. 24 (1), pp. 3323-3331

    Abstract
    A multigrid algorithm for implementation on unstructured meshes is proposed. The algorithm uses a sequence of unnested grids and requires the development of efficient inter-grid [...]

  • R. Lohner
    Computer Methods in Applied Mechanics and Engineering (1987). Vol. 61 (6), pp. 323-338

    Abstract
    An adaptive finite element scheme for transient problems is presented. The classic h-enrichment / coarsening is employed in conjunction with a triangular finite element [...]

  • R. Lohner
    International Journal for Numerical Methods in Engineering (1987). Vol. 24 (9), pp. 1741-1756

    Abstract
    The current state of the art of Finite Element Methods in Computational Fluid Dynamics is reviewed. The aim of this review is to point out what appear currently as the [...]

  • R. Lohner, K. Morgan, J. Peraire, M. Vahdati
    International Journal for Numerical Methods in Fluids (1987). Vol. 7 (10), pp. 356-361

    Abstract
    A high resolution finite element method for the solution of problems involving high speed compressible flows is presented. The method uses the concepts of flux-corrected transport [...]

  • R. Lohner
    Communications in numerical methods in engineering (1988). Vol. 4 (1), pp. 123-135

    Abstract
    Several data structures for the generation of unstructured grids are described. Their usefulness stems from the fact that they enable the necessary search operations to be [...]

  • J. Baum, R. Lohner
    AIAA Journal (1988). Vol. 32 (4), pp. 682-690

    Abstract
    A recently developed transient, two-dimensional, finite-element shock capturing scheme is applied to the study of shock interaction with a box suspended above a rigid surface. [...]

  • K. Morgan, J. Peraire, R. Lohner
    (1988). Finite Elements. ICASE/NASA LaRC Series. Springer, New York, NY

    Abstract
    In previous papers [1,2] we have described an explicit finite element solution procedure for the compressible Euler and Navier-Stokes equations. The approach was a finite [...]

  • R. Lohner, P. Parikh
    International Journal for Numerical Methods in Fluids (1988). Vol. 8 (10), pp. 1135-1149

    Abstract
    The generation of three-dimensional unstructured grids using the advancing-front technique is described. This technique has been shown to be effective for the generation [...]

  • R. Lohner
    Computers and Structures (1988). Vol. 30 (1-2), pp. 303-317

    Abstract
    The combination of adaptive remeshing techniques, flow solvers for transient problems with moving grids, and integrators for rigid body motion is presented. The resulting [...]

  • R. Lohner, K. Morgan, M. Vahdati, J. Boris, D. Book
    Communications in numerical methods in engineering (1988). Vol. 4 (6), pp. 356-370

    Abstract
    We present the extension of flux‐corrected transport (FCT) schemes to unstructured grids. The spatial discretization is performed via finite elements. In particular, [...]

  • R. Lohner
    Computer Methods in Applied Mechanics and Engineering (1989). Vol. 75 (1-3), pp. 195-214

    Abstract
    Adaptive remeshing schemes for transient problems are presented. The main advantage of these schemes is the ease in incorporating directional refinement and body motion [...]

  • R. Lohner, J. Ambrosiano
    Journal of Computational Physics (1990). Vol. 91 (1), pp. 22-31

    Abstract
    A vectorized particle tracer for unstructured grids is described. The basic approach is to use elementary properties of the linear basis functions to search for particles [...]

  • J. Baum, E. Loth, R. Lohner
    (1990). AIP Conference Proceedings, vol. 209

    Abstract
    The objective of this research is to investigate shock interaction with complex geometry canisters suspended above a rigid elevated [...]

  • R. Lohner
    Computing Systems in Engineering (1990). Vol. 1 (2), pp. 257-272

    Abstract
    The combination of adaptive remeshing techniques, flow solvers for transient problems with moving grids, and consistent rigid body motion integrators in three dimensions is [...]

  • J. Ambrosiano, S. Brandon, R. Lohner
    (1991). Proceeding 14th Conference on Numerical Simulation of Plasmas, Annapolis

    Abstract
    There is an increasing demand to use kinetic plasma simulations to model real plasma devices such as e-beam diodes, plasma torches, opening switches, and so on. With this [...]

  • R. Lohner
    (1991). The finite element method in the 1990’s. Springer, Berlin, Heidelberg

    Abstract
    The current trends for the simulation of large-scale incompressible flow fields using finite elements are discussed. The main items are: a) the use of simple elements through [...]

  • M. McGrory, R. Lohner, R. Walters
    AIAA Journal (1991). Vol. 29 (1), pp. 1844-1849

    Abstract
    A three-dimensional space-marching algorithm using an unstructured discretization is proposed. The method utilizes a two-dimensional unstructured grid generator to construct [...]

  • E. Loth, J. Baum, R. Lohner
    AIAA Journal (1992). Vol. 30 (1), pp. 268-270

    Abstract
    The formation of shocks within axisymmetric supersonic nozzles has received considerable attention in the past, both experimentally and computationally. The presence of undesirable [...]

  • R. Lohner, J. Camberos, M. Merriam
    Computer Methods in Applied Mechanics and Engineering (1992). Vol. 95 (3), pp. 343-357

    Abstract
    A parallel unstructured grid generation algorithm is presented and implemented on the INTEL hypercube. Different processor hierarchies are discussed, and the appropriate hierarchies [...]

  • S. Siver, E. Loth, J. Baum, R. Lohner
    Shock Waves (1992). Vol. 2, pp. 31-41

    Abstract
    Numerical simulations with a monotonicity preserving flow solver have been performed to study shock diffraction phenomena and shock wave generated vorticity. The computations [...]

  • R. Lohner
    (1992). Special Course on Unstructured Grid Methods for Advection Dominated Flows

    Abstract
    Numerical methods for the solution of field problems using unstructured grids have reached a high degree of maturity. Although computational fluid dynamics (CFD) have been [...]

  • E. Loth, K. Kailasanth, R. Lohner
    Journal of Spacecraft and Rockets (1992). Vol. 29 (3), pp. 352-359

    Abstract
    Large eddy numerical simulations of supersonic flows over an axisymmetric backward-facing step have been completed using a recently developed axisymmetric version of the finite [...]

  • R. Lohner, J. Baum
    International Journal for Numerical Methods in Fluids (1992). Vol. 14 (12), pp. 1407-1419

    Abstract
    An adaptive finite element scheme for transient problems is presented. The classic h‐enrichment/coarsening is employed in conjunction with a tetrahedral finite element [...]

  • S. Siver, E. Loth, J. Baum, R. Lohner
    (1993). Thirteenth International Conference on Numerical Methods in Fluid Dynamics. Lecture Notes in Physics, vol 414. Springer, Berlin, Heidelberg

    Abstract
    This paper describes a Finite Element Method - Flux Corrected Transport (FEM-FCT) approach with an unstructured adaptive grid scheme to the simulation of two-phase flow. The [...]

  • H. Luo, J. Baum, R. Lohner, J. Cabello
    AIAA Journal (1993). Vol. 11 (2), pp. 1027-1028

    Abstract
    The development of an implicit 3D finite element algorithm for the solution of the compressible Euler and Navier-Stokes equations on unstructured meshes is reported. [...]

  • R. Lohner
    International Journal for Numerical Methods in Engineering (1993). Vol. 36 (19), pp. 3259-3270

    Abstract
    Several renumbering strategies for unstructured grids are discussed. They lead to a minimization of eache-misses and an optimal grouping of elements for different computer [...]

  • A. Shostko, R. Lohner
    International Journal for Numerical Methods in Engineering (1994). Vol. 38 (6), pp. 905-925

    Abstract
    An algorithm for the parallel generation of 3-D unstructured grids is presented. The technique is an extension of the algorithm presented in Reference 21 for the 2-D case. [...]

  • J. Ambrosiano, S. Brandon, R. Lohner, R. DeVore
    Journal of Computational Physics (1994). Vol. 110 (2), pp. 310-319

    Abstract
    Traditional techniques for computing electromagnetic solutions in the time domain rely on finite differences. These so-called finite-difference time-domain (FDTD) methods [...]

  • J. Baum, R. Lohner
    AIAA Journal (1994). Vol. 32 (4), pp. 682-692

    Abstract
    A transient two-dimensional, finite elemnt shock capturing scheme on unstructured grids was applied to the study of a shock interacting with a box suspended above a rigid [...]

  • H. Luo, J. Baum, R. Lohner
    AIAA Journal (1994). Vol. 32 (6), pp. 1182-1190

    Abstract
    This paper describes the development, validation, and application of a new finite element scheme for the solution of the compressible Euler equations on unstructured grids. [...]

  • S. Siver, E. Loth, J. Baum, R. Lohner
    Shock Waves (1994). Vol. 4 (1), pp. 15-23

    Abstract
    The passage of planar shocks in a dusty gas was investigated to note effects due to particle loading and initial shock Mach number. Two-phase flow equations have been added [...]

  • J. Fave, R. Lohner
    International Journal for Numerical Methods in Engineering (1994). Vol. 37 (20), pp. 3571-3580

    Abstract
    A new ray‐tracing technique is presented which does not work with ray–object intersections per se , but is based on the traversal of an unstructured tetrahedral [...]

  • R. Lohner
    Computer Methods in Applied Mechanics and Engineering (1994). Vol. 111 (3-4), pp. 255-263

    Abstract
    Several possibilities for the reduction of indirect addressing operations within edge-based solvers are discussed. It is shown that indirect addressing operations may be reduced [...]

  • R. Lohner, J. McAnally
    International Journal for Numerical Methods for Heat and Fluid Flow (1994). Vol. 4 (4), pp. 311-327

    Abstract
    A new heat transfer simulation capability is described. Non-traditional features of this capability include: a seamless link to CAD-CAM for rapid problem specification/description, [...]

  • H. Luo, J. Baum, R. Lohner
    (1995). Shock Waves @ Marseille I. Springer, Berlin, Heidelberg

    Abstract
    This paper describes an extensive comparison study of two high-order-accuracy finite-element schemes: one of upwind type, the other of flux-corrected transport type, for the [...]

  • R. Lohner
    Engineering Fracture Mechanics (1995). Vol. 50 (5-6), pp. 819-847

    Abstract
    The development, application and impact of mesh adaptation procedures in the field of computational fluid mechanics (CFD) are reviewed. The discussion is restricted to unstructured [...]

  • R. Frainchtein, S. Zalesak, R. Lohner, D. Spicer
    Computer Physics Communications (1995). Vol. 86 (1-2), pp. 25-39

    Abstract
    A finite element MHD algorithm is used to simulate a two-dimensional, viscous and resistive turbulent model, namely the Orszag-Tang vortex. The results are compared [...]

  • R. Lohner
    Journal of Computational Physics (1995). Vol. 118 (2), pp. 380-387

    Abstract
        Several search algorithms for the interpolation of data associated with unstructured grids are reviewed and compared. Particular emphasis is [...]

  • R. Ramamurti, R. Lohner
    (1995). Parallel Computational Fluid Dynamics 1993, New Trends and Advances, pp. 443-450

    Abstract
    An incompressible flow solver based on unstructured grids is implemented on parallel distributed-memory computer architecture. An important phase in the flow solver [...]

  • R. Ramamurti, R. Lohner, W. Sandberg
    Transactions on Engineering Science (1996). Vol. 9, pp. 169-178

    Abstract
    Only recently has a capability for computing three-dimensional, unsteady incompressible flow over a changing geometry become available. In that work, the flow field generated [...]

  • J. Baum, H. Luo, R. Lohner
    (1996). Computation of Three-Dimensional Complex Flows. Notes on Numerical Fluid Mechanics (NNFM), vol 49. Vieweg+Teubner Verlag

    Abstract
          This paper describes the application of FEFL096, a three-dimensional, adaptive, finite element, edge-based, ALE shock capturing methodology [...]

  • R. Ramamurti, R. Lohner
    Computers and Fluids (1996). Vol. 25 (2), pp. 119-132

    Abstract
        An incompressible flow solver based on unstructured grids is implemented on a parallel distributed memory computer architecture. An important [...]

  • S. Siver, E. Loth, J. Baum, R. Lohner
    AIAA Journal (1996). Vol. 34 (5), pp. 1078-1080

    Abstract
    Our objective is to formulate and develop an Eulerian-Lagrangian (E-L) method with an adaptive grid FEM-FCT flow solver that is computationally efficient. This method is used [...]

  • R. Lohner
    Journal of Computational Physics (1996). Vol. 126 (1), pp. 1-10

    Abstract
        An advancing front surface gridding technique that operates on discretely defined surfaces (i.e. triangulations) is presented. Different aspects [...]

  • R. Lohner
    Engineering with Computers (1996). Vol. 12, pp. 186-210

    Abstract
    We describe recent extensions and improvements to the advancing front grid generation technique. These improvements target a range of applicability, speed and user friendliness. [...]

  • R. Lohner, C. Yang
    Commun. Numer. Meth. Engng (1996). Vol. 12 (10), pp. 599-608

    Abstract
    A Laplacian smoothing of the mesh velocities with variable diffusivity based on the distance from moving bodies is introduced. This variable diffusivity enforces a more uniform [...]

  • R. Lohner
    Comput. Methods Appl. Mech. Engrg., (1996). Vol. 5 (10), pp. 119-132

    Abstract
    We describe extensions and improvements to the advancing front grid generation technique that have proven useful over the years. The following areas are treated in detail: [...]

  • R. Lohner, C. Yang
    Commun. Numer. Meth. Engng (1996). Vol. 12 (10), pp. 599-608

    Abstract
    A Laplacian smoothing of the mesh velocities with variable diffusivity based on the distance from moving bodies is introduced. This variable diffusivity enforces a more uniform [...]

  • D. Spicer, S. Zalesak, R. Lohner, S. Curtis
    Advances in Space Research (1996). Vol. 18 (8), pp. 253-262

    Abstract
    We present the first results from a new unstructured mesh three dimensional finite element MHD code which uses dynamic solution-adaptive mesh refinement in a manner similar [...]

  • M. Nagaoka, R. Lohner
    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers (1997). Vol. 63 (605), pp. 153-160

    Abstract
    Preconditioned iterative methods in an implicit unstructured grid solver of compressible flows are compared. The three-dimensional Euler and Navier-Stokes equations are discretized [...]

  • R. Lohner
    Finite Elements in Analysis and Design (1997). Vol. 25 (1-2), pp. 111-134

    Abstract
    A review of automatic unstructured grid generators is given. These types of grids have found widespread use in computational fluid dynamics, computational structural dynamics, [...]

  • J. Cebral
    AIAA Journal (1997). Vol. 35 (4), pp. 687-692

    Abstract
    The loose coupling of computational fluid dynamics and computational structural dynamics solvers introduces some problems related to the information transfer between the codes. [...]

  • R. Lohner
    (1998). ICASE/LaRC Interdisciplinary Series in Science and Engineering. Vol 6, pp. 195-212. Springer, Dordrecht

    Abstract
    Against the general feeling that ‘CFD is solved’, I offer a few remarks from the trenches. When performing large-scale simulations of geometrically and physically [...]

  • J. Tuszynski, R. Lohner
    Comput. Methods Appl. Mech. Engrg., (1998). Vol. 14 (8), pp. 773-781

    Abstract
    A way has been found to form indirect addressing lists in parallel on shared-memory parallel machines. The maximum possible speed-up for typical tetrahedral grids is approximately [...]

  • R. Lohner
    Comput. Methods Appl. Mech. Engrg., (1998). Vol. 163 (1-4), pp. 95-109

    Abstract
    Two renumbering strategies for field solvers based on unstructured grids that operate on shared-memory, cache-based parallel machines are described. Special attention is paid [...]

  • L. Spradley, R. Lohner, T. Chung
    AIAA Journal (1998). Vol. 36 (9), pp. 1735-1737

    Abstract
    One of the most time-consuming tasks in performing any discrete analysis the construction of a suitable mesh to represent the computational domain. Mesh generation today remains [...]

  • J. Cebral, R. Lohner
    (1998). Computational Fluid Dynamics Review 1998, Part 9, pp. 1097-1112

    Abstract
    The use of parallel computers and in particular distributed memory architectures imposes a number of requirements on the visualization systems for Computational Fluid Dynamics [...]

  • R. Ramamurti, R. Lohner, W. Sandberg
    Int. J. Computational Fluid Dynamics (1999). Vol. 13 (1), pp. 83-99

    Abstract
    A 3-D incompressible unsteady flow solver based on simple finite elements with adaptive remeshing and grid movement for both moving and deforming surfaces is described. We [...]

  • R. Lohner, J. Cebral
    (1999). IMR

    Abstract
    A parallel advancing front scheme has been developed. The domain to be gridded is rst subdivided spatially using a relatively coarse octree. Boxes are then identiied and gridded [...]

  • A. Shostko, R. Lohner, W. Sanderg
    Int. J. Numer. Meth. Engng. (1999). Vol. 44 (9), pp. 1359-1376

    Abstract
    A method for the rapid construction of meshes over intersecting triangulated shapes is described. The method is based on an algorithm that automatically generates a surface [...]

  • R. Lohner, C. Yang, J. Baum, H. Luo, D. Pelessone, C. Charman
    Int. J. Numer. Meth. Fluids (1999). Vol. 31 (1), pp. 113-120

    Abstract
    A methodology for the simulation of strongly unsteady flows with hundreds of moving bodies has been developed. An unstructured grid, high-order, monotonicity preserving, ALE [...]

  • C. Kiat Ho, R. Lohner, R. Ramamurti
    (1999). American Physical Society, Division of Fluid Dynamics Meeting

    Abstract
    The interactions between a cylinder body and a ducted propeller is simulated using a coupled Navier-Stokes and actuator disc approach. The actuator disc approach raises the [...]

  • R. Lohner
    (1995). Proceedings, 4th International Meshing Roundtable, Sandia National Laboratories, pp.29-44

    Abstract
    An advancing front gridding technique that operates on discretely defined surfaces is presented. Different aspects that are required to make the procedure reliable for complex [...]

  • H. Luo, J. Baum, R. Lohner
    Int. J. Numer. Meth. Fluids (2000). Vol. 14 (2), pp. 133-157

    Abstract
    A fast, matrix-free implicit method has been developed to solve low Mach number flow problems on unstructured grids. The preconditioned compressible Euler and Navier-Stokes [...]

  • F. Camelli, R. Lohner
    (2000). European Congress on Computational Methods in Applied Sciences and Engineering

    Abstract
    A series of simulations were performed in order to test the accuracy of FEFLO for problems of flow and dispersion around buildings. The major case was extracted from the Evaluation [...]

  • P. Yim, R. Mullick, R. Summers, H. Marcos, J. Cebral, R. Lohner, P. Choyke
    (2000). Proceedings Volume 3978, Medical Imaging 2000: Physiology and Function from Multidimensional

    Abstract
    Measurement of stenosis due to atherosclerosis is essential for interventional planning. Currently, measurement of stenosis from magnetic resonance angiography (MRA) is made [...]

  • R. Lohner, J. Cebral
    Int. J. Numer. Meth. Engng. (2000). Vol. 49 (1-2), pp. 219-232

    Abstract
    A procedure for the generation of highly stretched grids suitable for Reynolds‐averaged Navier–Stokes (RANS) calculations is presented. In a first stage, an isotropic [...]

  • J. Baum, E. Mestreau, H. Luo, D. Sharov, R. Lohner
    (2000). 1st Modeling and Simulation Subcommittee; November 13, 2000 - November 17, 2000; Monterey, CA; United States

    Abstract
    The paper describes a numerical study of a potential accident scenario of the space shuttle, operating at the same flight conditions as flight 51L, the Challenger accident. [...]

  • H. Luo, D. Sharov, J. Baum, R. Lohner
    Int. J. Numer. Meth. Fluids (2001). Vol. 14 (4), pp. 253-270

    Abstract
    An accurate, fast, matrix-free implicit method has been developed to solve compressible turbulent How problems using the Spalart and Allmaras one equation turbulence model [...]

  • C. Yang, F. Noblesse, R. Lohner, D. Hendrix
    (2001). Twenty-Third Symposium on Naval Hydrodynamics, pp. 206-222

    Abstract
    Four methods of analysis — a nonlinear method based on Euler's equations and three linear potential flow methods — are used to determine the optimal lo- cation [...]

  • D. Sharov, H. Luo, J. Baum, R. Lohner
    (2001). Computational Fluid Dynamics 2000. Springer, Berlin, Heidelberg

    Abstract
    An unstructured grid matrix-free GMRES+LU-SGS scheme is used to simulate unsteady CFD problems with moving bodies. The method is applied on sharedmemory, cache-based parallel [...]

  • J. Baum, H. Luo, E. Mestreau, R. Lohner, D. Pelessone, C. Charman
    (2001). Computational Fluid Dynamics 2000. Springer, Berlin, Heidelberg

    Abstract
    Several classes of important engineering problems require the concurrent application of CFD and CSD techniques. Currently, attempts to model these problems are solved either [...]

  • H. Luo, J. Baum, R. Lohner
    Computers and Fluids (2001). Vol. 30 (2), pp. 137-159

    Abstract
    An accurate, fast, matrix-free implicit method has been developed to solve the three-dimensional compressible unsteady flows on unstructured grids. A nonlinear system of equations [...]

  • J. Cebral, P. Yim, R. Lohner, O. Soto, H. Marcos, P. Choyke
    (2001). Proceedings Volume 4321, Medical Imaging 2001: Physiology and Function from Multidimensional

    Abstract
    Computational fluid dynamics (CFD) models of the carotid artery are constructed from contrast-enhanced magnetic resonance angiography (MRA) using a deformable model and a [...]

  • P. Yim, J. Cebral, R. Lohner, P. Choyke, H. Marcos, O. Soto
    (2001). Proceedings Volume 4321, Medical Imaging 2001: Physiology and Function from Multidimensional

    Abstract
    Blood flow temporal waveforms change with position along an artery. The change in the flow waveforms can be accounted for by a transmission line model of flow. According to [...]

  • D. Sharov, H. Luo, J. Baum, R. Lohner
    Int. J. Numer. Meth. Fluids (2003). Vol. 43 (6-7), pp. 717-728

    Abstract
    Problems related to automatic generation of highly stretched unstructured grids suitable for 3‐D Reynolds‐averaged Navier–Stokes computations are addressed. Special [...]

  • O. Soto, R. Lohner
    Int. J. Numer. Meth. Engng. (2001). Vol. 51 (6), pp. 735-753

    Abstract
    A design methodology based on the adjoint approach for flow problems governed by the incompressible Euler equations is presented. The main feature of the algorithm is that [...]

  • R. Lohner
    Int. J. Numer. Meth. Engng. (2001). Vol. 51 (6), pp. 663-678

    Abstract
    A parallel advancing front scheme has been developed. The domain to be gridded is first subdivided spatially using a relatively coarse octree. Boxes are then identified and [...]