Abstract

The work presented in this paper describes a novel multi-phase discharge and dispersion model capable of predicting the near-field fluid dynamics and phase-transition phenomena associated with accidental CO2 releases. Also presented in this paper are previously unpublished data describing the near-field structure of a number of largescale CO2 experimental releases, obtained through the EU-FP7 CO2PipeHaz (2009) project. The calculations employed an adaptive finite-volume grid algorithm to solve the Favre-averaged fluid-flow equations. This equation set was closed with the inclusion of both a two-equation k-e model and a second-moment Reynolds stress model to represent turbulent fluctuations. Results demonstrate the superior performance of the Reynolds stress transport model when compared to its compressibility-corrected counterpart. Document type: Part of book or chapter of book

Abstract

The development of a new Reynolds stress model suitable for computations of separated flows is described. It is based on the recently published version of SSG/LRRmodel, which includes a correction eliminating streamline back-bending near the reattachment point. Modifications are proposed which reduce the turbulence kinetic energy dissipation rate and pressure-strain term near the separation point. The validation results using the Diverging channel flow test case are presented. The quality of the obtained results is assessed.