Gutiérrez Romero et al 2017a - Revision history

Julio at 08:37, 28 October 2019

2019-10-28T08:37:42Z

Julio at 09:57, 4 April 2017

2017-04-04T09:57:23Z

Julio at 08:21, 2 March 2017

2017-03-02T08:21:28Z

Jose Enrique at 07:44, 1 March 2017

2017-03-01T07:44:25Z

Jose Enrique at 07:43, 1 March 2017

2017-03-01T07:43:25Z

Jose Enrique at 07:42, 1 March 2017

2017-03-01T07:42:57Z

Jose Enrique at 07:33, 1 March 2017

2017-03-01T07:33:09Z

Jose Enrique at 07:31, 1 March 2017

2017-03-01T07:31:13Z

Jose Enrique at 07:30, 1 March 2017

2017-03-01T07:30:08Z

Julio at 17:31, 28 February 2017

2017-02-28T17:31:27Z

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 ===6.1 RAO analysis and comparison===
-First, a RAO analysis is performed in the absence of wind. The frequency results of the seakeeping solver are obtained after applying a Fourier transform to the time history generated. Figure [[#img-12|12]] shows an inter-code comparison. Note that a good agreement among the different solvers is found Ramanchandran.
+First, a RAO analysis is performed in the absence of wind. The frequency results of the seakeeping solver are obtained after applying a Fourier transform to the time history generated. Figure [[#img-12|12]] shows an inter-code comparison. Note that a good agreement among the different solvers is found <span id='citeF-49'></span>[[#cite-49|[49]]].
 <div id='img-12'></div>

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 Finally, four analyses of the OC3 spar buoy in operational conditions are presented. The different analyses are carried out in similar environmental conditions, but using first and second-order irregular waves. Furthermore, additional studies including Quasi-Static and dynamic mooring models are performed. The goal of these analyses is to evaluate the effects of the mooring model and the wave order on the dynamics of the system, as well as to estimate the tension in the mooring lines. On the one hand, the wind turbine system is assumed to be operating at an average wind speed of 11.4 m/s, which generates the maximum thrust and torque. FASTLognoter <span id='citeF-50'></span><span id='citeF-51'></span>[[#cite-50|[50,51]]] has been used to linearise with FAST <span id='citeF-50'></span>[[#cite-50|[50]]] the behaviour of the wind turbine around the operating wind speed. Restoration and damping matrices resulting from the linearisation of the wind turbine system are included into the global dynamics. It should be remarked that the rotational and periodicity effects are considered in the calculation of the steady state matrix. On the other hand, the wind loads are estimated considering non-uniform wind flow, with an average wind speed of 11.4 m/s. The wind flow profile is obtained using Turbsim <span id='citeF-55'></span>[[#cite-55|[55]]], and the wind loads on the wind turbine are obtained from FAST/AeroDyn <span id='citeF-50'></span>[[#cite-50|[50]]].
 {|  class="floating_tableSCP wikitable" style="text-align: center; margin: 1em auto;"
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 Table [[#table-3|3]] shows the mean and RMS values, as well as the motion amplitude for the first and second-order movements. When comparing the QS and the NFEM models, only slight differences are observed. In particular, the second-order pitch motion is higher when using the NFEM model, compared to the QS model, while the other values remain with similar trends for both models.
 {|  class="floating_tableSCP wikitable" style="text-align: center; margin: 1em auto;"
@@ Line 924: / Line 922: @@
 |}
 Figure [[#img-17|17]] shows the  tension for each mooring line at the fairlead point. The NFEM model recorded larger amplitude oscillations (in the range of 5 s to 10 s period) compared with QS model. The differences observed in Fig. [[#img-17|17]] in the tension amplitude reach up to 24 <math display="inline">%</math>. This fact suggests that using a QS model for fatigue assessment of the mooring lines could overestimate their fatigue life.

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 |}
 The Ms Excel file below includes the results of the time evolution of the cable under its self weight (corresponding to Figure [[#img-5|5]]).
+  [[Media:Gutiérrez_Romero_et_al_2017a_2885_Case_1.xlsx|Case_1.xlsx]]
 [[Media:Gutiérrez_Romero_et_al_2017a_2885_Case_1.xlsx|Case_1.xlsx]]
 ==Case 2: Free vibration cable==

@@ Line 519: / Line 519: @@
 The Ms Excel file below includes the results of the time evolution of the cable under its self weight (corresponding to Figure [[#img-5|5]]).
-[[Media:Gutiérrez_Romero_et_al_2017a_7862_Cable_under_itself_weight.xlsx|Cable_under_itself_weight.xlsx]]
+[[Media:Gutiérrez_Romero_et_al_2017a_2885_Case_1.xlsx|Case_1.xlsx]]
 ==Case 2: Free vibration cable==

@@ Line 1,029: / Line 1,029: @@
 * Different analyses of a FOWT based on the Hywind concept <span id='citeF-52'></span><span id='citeF-53'></span>[[#cite-52|[52,53]]] are performed. RAO curves are compared with those obtained by other authors, showing a good agreement. Moreover, a comparison among the linear, the QS, and the NFEM models are carried out for frequencies around pitch resonance, obtaining large differences among mooring models.
 * The Hywind FOWT is analysed under a realistic operational condition. Second-order coupled simulations are carried out considering a real wind profile, and with two types of mooring models; the QS and the NFEM. Results from both cases are compared. The NFEM mooring model combined with second-order waves and real wind provides a realistic simulation of the performance of the floating wind turbine. The comparison suggests that using a QS model for fatigue assessment of the mooring lines could overestimate their fatigue life. Furthermore, first-order approximation can underestimate tension values on the mooring systems.
 ==References==

@@ Line 629: / Line 629: @@
 |}
-===Additional data===
+The Ms Excel file below includes the RAO curves obtained in the present work and the data from HydroDyn and WAMIT used as reference (see Figure [[#img-12|12]]).
-This section includes data to compare your results. The excel file includes RAO curves of HydroDyn, WAMIT and present work, (see Figure [[#img-12|12]]).
-[[Media:Draft_Gutiérrez_Romero_949540503_3004_RAOS.xlsx|RAOS.xlsx]]
+   [[Media:Draft_Gutiérrez_Romero_949540503_3004_RAOS.xlsx|RAOS.xlsx]]
 ===6.2 Mooring analysis around pitch resonance===