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 > 0.5*GridHeight)
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 > 0.5*GridHeight)
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]