Turbsim v2.0.0.7 in Fast v8.16 for 5 MW wind turbine.

Dear Dr. Jason,
I am looking for TurbSim Input File for NREL 5MW Baseline Turbine(Test 18).
For a land-based wind turbine, you would typically set the grid size to be about 10% more than the rotor diameter in the horizontal and vertical directions.In Test18,the value of rator diameter is 126m,so you would set the grid size to be about 138.6(126+126*0.1). Actually I found two turbsim input files.The differences are the value of RandSeed1 and NumGrid_Z, NumGrid_Y.Should I use the first one or the second one?
The first one is downloaded from your google drive.
The second file is found on the website:
http://ramslandtechnology.com/Limited_Modeling/data/5MW_onshore%20_12mps_normal_turbulence/90m_12mps_twr.inp.txt

The difference has been bolded as follows
The first one:
TurbSim Input File. Valid for TurbSim v1.50; 17-May-2010; Example file that can be used with simulations for the NREL 5MW Baseline Turbine

---------Runtime Options-----------------------------------
511347 RandSeed1 - First random seed (-2147483648 to 2147483647)
RanLux RandSeed2 - Second random seed (-2147483648 to 2147483647) for intrinsic pRNG, or an alternative pRNG: “RanLux” or “RNSNLW”
False WrBHHTP - Output hub-height turbulence parameters in binary form? (Generates RootName.bin)
False WrFHHTP - Output hub-height turbulence parameters in formatted form? (Generates RootName.dat)
False WrADHH - Output hub-height time-series data in AeroDyn form? (Generates RootName.hh)
True WrADFF - Output full-field time-series data in TurbSim/AeroDyn form? (Generates RootName.bts)
False WrBLFF - Output full-field time-series data in BLADED/AeroDyn form? (Generates RootName.wnd)
False WrADTWR - Output tower time-series data? (Generates RootName.twr)
False WrFMTFF - Output full-field time-series data in formatted (readable) form? (Generates RootName.u, RootName.v, RootName.w)
False WrACT - Output coherent turbulence time steps in AeroDyn form? (Generates RootName.cts)
True Clockwise - Clockwise rotation looking downwind? (used only for full-field binary files - not necessary for AeroDyn)
0 ScaleIEC - Scale IEC turbulence models to exact target standard deviation? [0=no additional scaling; 1=use hub scale uniformly; 2=use individual scales]

--------Turbine/Model Specifications-----------------------
21 NumGrid_Z - Vertical grid-point matrix dimension
21 NumGrid_Y - Horizontal grid-point matrix dimension
0.05 TimeStep - Time step [seconds]
630.0 AnalysisTime - Length of analysis time series [seconds]
630.0 UsableTime - Usable length of output time series [seconds] (program will add GridWidth/MeanHHWS seconds)
90.0 HubHt - Hub height [m] (should be > 0.5GridHeight)
155.0 GridHeight - Grid height [m]
155.0 GridWidth - Grid width [m] (should be >= 2
(RotorRadius+ShaftLength))
0 VFlowAng - Vertical mean flow (uptilt) angle [degrees]
0 HFlowAng - Horizontal mean flow (skew) angle [degrees]

The second one:
TurbSim Input File. Valid for TurbSim v1.50; 17-May-2010; Example file that can be used with simulations for the NREL 5MW Baseline Turbine; note that UsableTime has been decreased in this file so that the file distributed with the FAST CertTest isn’t as large

---------Runtime Options-----------------------------------
13428 RandSeed1 - First random seed (-2147483648 to 2147483647)
RanLux RandSeed2 - Second random seed (-2147483648 to 2147483647) for intrinsic pRNG, or an alternative pRNG: “RanLux” or “RNSNLW”
False WrBHHTP - Output hub-height turbulence parameters in binary form? (Generates RootName.bin)
False WrFHHTP - Output hub-height turbulence parameters in formatted form? (Generates RootName.dat)
False WrADHH - Output hub-height time-series data in AeroDyn form? (Generates RootName.hh)
True WrADFF - Output full-field time-series data in TurbSim/AeroDyn form? (Generates RootName.bts)
False WrBLFF - Output full-field time-series data in BLADED/AeroDyn form? (Generates RootName.wnd)
True WrADTWR - Output tower time-series data? (Generates RootName.twr)
False WrFMTFF - Output full-field time-series data in formatted (readable) form? (Generates RootName.u, RootName.v, RootName.w)
False WrACT - Output coherent turbulence time steps in AeroDyn form? (Generates RootName.cts)
True Clockwise - Clockwise rotation looking downwind? (used only for full-field binary files - not necessary for AeroDyn)
0 ScaleIEC - Scale IEC turbulence models to exact target standard deviation? [0=no additional scaling; 1=use hub scale uniformly; 2=use individual scales]

--------Turbine/Model Specifications-----------------------
31 NumGrid_Z - Verti+cal grid-point matrix dimension
31 NumGrid_Y - Horizontal grid-point matrix dimension
0.05 TimeStep - Time step [seconds]
630.0 AnalysisTime - Length of analysis time series [seconds]
600.0 UsableTime - Usable length of output time series [seconds] (program will add GridWidth/MeanHHWS seconds) [bjj: was 630]
90.0 HubHt - Hub height [m] (should be > 0.5GridHeight)
145.0 GridHeight - Grid height [m]
145.0 GridWidth - Grid width [m] (should be >= 2
(RotorRadius+ShaftLength))
0 VFlowAng - Vertical mean flow (uptilt) angle [degrees]
0 HFlowAng - Horizontal mean flow (skew) angle [degrees]

Dear Kaiyu.Fang,

Regarding the grid in TurbSim, our typical recommendation is to set the grid spacing in Y and Z equal to maximum chordlength of the wind turbine being simulated, which is about 5 m for the NREL 5-MW baseline wind turbine (discretization is typically a balance to minimize computational expense and refine fine enough for convergence of the solution). So, the first TurbSim model is a bit coarser than recommend (155 m/(20-1) = 7.75 m) and the second model is a bit finer than recommend (145 m/(30-1) = 4.83 m). Ideally, you’d probably use something like GridHeight = GridWidth = 140 m (10% larger than the rotor diameter) and NumGrid_Y = NumGrid_Z = 29, such that 140/(29-1) = 5 m.

Regarding the random seed, ideally you should set this differently every time you run TurbSim, so, neither file is more correct.

Best regards,

Dear Jason,

Thank you again for your answer. It really helps a lot.

Best regards