Dear Dr. Jonkman and members,
I’m working on the Fast.farm to export low and high-resolution vtk files in yawed wake condition.
So I’m trying to simulate two NREL 5MW WTs with curled wake model in TSinflow_curl folder in r-test.
I simulated yawed upstream turbine (T1) and no yawed downstream turbine (T2) for 1,200 seconds.
As a result, the wake of T2 is truncated in both low and high resolution vtk files, not fully developed as shown in the figures.
Also, when plotting the streamlines on the slice of the velocity fields of WT1 and WT2, Counter-rotating vortices, which should be contained in curled wake model, were not observed.
Is there anything I miss on this simulation settings? Because I believe I set it up well according to the fast-farm model guidance.
This is my parameters in fstf file.
------- FAST.Farm for OpenFAST INPUT FILE -------------------------------------------------
FAST.Farm input file, using two turbines separated by 7D downstream and an offset of 30m, turbulent inflow, yaw maneuver for WT1
--- SIMULATION CONTROL ---
True Echo - Echo input data to <RootName>.ech? (flag)
FATAL AbortLevel - Error level when simulation should abort (string) {"WARNING", "SEVERE", "FATAL"}
1200.0 TMax - Total run time (s) [>=0.0]
False UseSC - Use a super controller? (flag)
2 Mod_AmbWind - Ambient wind model (-) (switch) {1: high-fidelity precursor in VTK format, 2: one InflowWind module, 3: multiple instances of InflowWind module}
2 Mod_WaveField - Wave field handling (-) (switch) {1: use individual HydroDyn inputs without adjustment, 2: adjust wave phases based on turbine offsets from farm origin}
0 Mod_SharedMooring - Shared mooring system model (switch) {0: None, 3=MoorDyn}}
--- SUPER CONTROLLER --- [used only for UseSC=True]
"unused" SC_FileName - Name/location of the dynamic library {.dll [Windows] or .so [Linux]} containing the Super Controller algorithms (quoated string)
--- SHARED MOORING SYSTEM --- [used only for Mod_SharedMoor>0]
"" SharedMoorFile - Name of file containing shared mooring system input parameters (quoted string) [used only when Mod_SharedMooring > 0]
0.04 DT_Mooring - Time step for farm-level mooring coupling with each turbine (s) [used only when Mod_SharedMooring > 0]
--- AMBIENT WIND: PRECURSOR IN VTK FORMAT --- [used only for Mod_AmbWind=1]
1.0 DT_Low-VTK - Time step for low -resolution wind data input files; will be used as the global FAST.Farm time step (s) [>0.0]
0.1 DT_High-VTK - Time step for high-resolution wind data input files (s) [>0.0]
"Inflow" WindFilePath - Path name to VTK wind data files from precursor (string)
False ChkWndFiles - Check all the ambient wind files for data consistency? (flag)
--- AMBIENT WIND: INFLOWWIND MODULE --- [used only for Mod_AmbWind=2 or 3]
1.0 DT_Low - Time step for low -resolution wind data interpolation; will be used as the global FAST.Farm time step (s) [>0.0]
0.1 DT_High - Time step for high-resolution wind data interpolation (s) [>0.0]
250 NX_Low - Number of low -resolution spatial nodes in X direction for wind data interpolation (-) [>=2]
50 NY_Low - Number of low -resolution spatial nodes in Y direction for wind data interpolation (-) [>=2]
18 NZ_Low - Number of low -resolution spatial nodes in Z direction for wind data interpolation (-) [>=2]
-150.0 X0_Low - Origin of low -resolution spatial nodes in X direction for wind data interpolation (m)
-196.0 Y0_Low - Origin of low -resolution spatial nodes in Y direction for wind data interpolation (m)
0.1 Z0_Low - Origin of low -resolution spatial nodes in Z direction for wind data interpolation (m)
10.0 dX_Low - Spacing of low -resolution spatial nodes in X direction for wind data interpolation (m) [>0.0]
8.0 dY_Low - Spacing of low -resolution spatial nodes in Y direction for wind data interpolation (m) [>0.0]
10.0 dZ_Low - Spacing of low -resolution spatial nodes in Z direction for wind data interpolation (m) [>0.0]
117 NX_High - Number of high-resolution spatial nodes in X direction for wind data interpolation (-) [>=2]
78 NY_High - Number of high-resolution spatial nodes in Y direction for wind data interpolation (-) [>=2]
25 NZ_High - Number of high-resolution spatial nodes in Z direction for wind data interpolation (-) [>=2]
"IW.dat" InflowFile - Name of file containing InflowWind module input parameters (quoted string)
--- WIND TURBINES ---
2 NumTurbines - Number of wind turbines (-) [>=1] [last 6 columns below used only for Mod_AmbWind=2 or 3]
WT_X WT_Y WT_Z WT_FASTInFile X0_High Y0_High Z0_High dX_High dY_High dZ_High
(m) (m) (m) (string) (m) (m) (m) (m) (m) (m)
0.0 0.0 0.0 "FFTest_WT1.fst" -122.96385542168673 -196.0 0.1 8.602 5.091 7.296
882.0 0.0 0.0 "FFTest_WT2.fst" 763.0843373493976 -196.0 0.1 8.602 5.091 7.296
--- WAKE DYNAMICS ---
2 Mod_Wake - Switch between wake formulations {1:Polar, 2:Curl, 3:Cartesian} (-) (switch)
4.0 dr - Radial increment of radial finite-difference grid (m) [>0.0]
50 NumRadii - Number of radii in the radial finite-difference grid (-) [>=2]
165 NumPlanes - Number of wake planes (-) [>=2] (a=0.33, K=0.5)
0.17 f_c - Cutoff (corner) frequency of the low-pass time-filter for the wake advection, deflection, and meandering model [recommended=1.28*U0/R] (Hz) [>0.0]
DEFAULT C_HWkDfl_O - Calibrated parameter in the correction for wake deflection defining the horizontal offset at the rotor(m) or DEFAULT [DEFAULT= 0.0 ]
DEFAULT C_HWkDfl_OY - Calibrated parameter in the correction for wake deflection defining the horizontal offset at the rotor scaled with yaw error (m/deg) or DEFAULT [DEFAULT= 0.0 if Mod_Wake is 2, 0.3 otherwise]
DEFAULT C_HWkDfl_x - Calibrated parameter in the correction for wake deflection defining the horizontal offset scaled with downstream distance(-) or DEFAULT [DEFAULT= 0.0 ]
DEFAULT C_HWkDfl_xY - Calibrated parameter in the correction for wake deflection defining the horizontal offset scaled with downstream distance and yaw error (1/deg) or DEFAULT [DEFAULT= 0.0 if Mod_Wake is 2, -0.004 otherwise]
DEFAULT C_NearWake - Calibrated parameter for the near-wake correction (-) [>1.0 and <2.5] or DEFAULT [DEFAULT=1.8]
DEFAULT k_vAmb - Calibrated parameter for the influence of ambient turbulence in the eddy viscosity (-) [>=0.0] or DEFAULT [DEFAULT=0.05 ]
DEFAULT k_vShr - Calibrated parameter for the influence of the shear layer in the eddy viscosity (-) [>=0.0] or DEFAULT [DEFAULT=0.016]
DEFAULT C_vAmb_DMin - Calibrated parameter in the eddy viscosity filter function for ambient turbulence defining the transitional diameter fraction between the minimum and exponential regions (-) [>=0.0 ] or DEFAULT [DEFAULT= 0.0 ]
DEFAULT C_vAmb_DMax - Calibrated parameter in the eddy viscosity filter function for ambient turbulence defining the transitional diameter fraction between the exponential and maximum regions (-) [> C_vAmb_DMin ] or DEFAULT [DEFAULT= 1.0 ]
DEFAULT C_vAmb_FMin - Calibrated parameter in the eddy viscosity filter function for ambient turbulence defining the value in the minimum region (-) [>=0.0 and <=1.0] or DEFAULT [DEFAULT= 1.0 ]
DEFAULT C_vAmb_Exp - Calibrated parameter in the eddy viscosity filter function for ambient turbulence defining the exponent in the exponential region (-) [> 0.0 ] or DEFAULT [DEFAULT= 0.01]
DEFAULT C_vShr_DMin - Calibrated parameter in the eddy viscosity filter function for the shear layer defining the transitional diameter fraction between the minimum and exponential regions (-) [>=0.0 ] or DEFAULT [DEFAULT= 3.0 ]
DEFAULT C_vShr_DMax - Calibrated parameter in the eddy viscosity filter function for the shear layer defining the transitional diameter fraction between the exponential and maximum regions (-) [> C_vShr_DMin ] or DEFAULT [DEFAULT=25.0 ]
DEFAULT C_vShr_FMin - Calibrated parameter in the eddy viscosity filter function for the shear layer defining the value in the minimum region (-) [>=0.0 and <=1.0] or DEFAULT [DEFAULT= 0.2 ]
DEFAULT C_vShr_Exp - Calibrated parameter in the eddy viscosity filter function for the shear layer defining the exponent in the exponential region (-) [> 0.0 ] or DEFAULT [DEFAULT= 0.1 ]
DEFAULT Mod_WakeDiam - Wake diameter calculation model (-) (switch) {1: rotor diameter, 2: velocity based, 3: mass-flux based, 4: momentum-flux based} or DEFAULT [DEFAULT=1]
DEFAULT C_WakeDiam - Calibrated parameter for wake diameter calculation (-) [>0.0 and <0.99] or DEFAULT [DEFAULT=0.95] [unused for Mod_WakeDiam=1]
DEFAULT Mod_Meander - Spatial filter model for wake meandering (-) (switch) {1: uniform, 2: truncated jinc, 3: windowed jinc} or DEFAULT [DEFAULT=3]
2.5 C_Meander - Calibrated parameter for wake meandering (-) [>=1.0] or DEFAULT [DEFAULT=1.9]
--- CURLED-WAKE PARAMETERS [only used if Mod_Wake=2 or 3] ---
DEFAULT Swirl - Switch to include swirl velocities in wake (-) (switch) [DEFAULT=TRUE]
0.1 k_VortexDecay - Vortex decay constant for curl (-) [DEFAULT=0]
DEFAULT NumVortices - The number of vortices in the curled wake model (-) [DEFAULT=100]
DEFAULT sigma_D - The width of the vortices in the curled wake model non-dimesionalized by rotor diameter (-) [DEFAULT=0.2]
DEFAULT FilterInit - Switch to filter the initial wake plane deficit and select the number of grid points for the filter {0: no filter, 1: filter of size 1} or DEFAULT [DEFAULT=1] (switch)
DEFAULT k_vCurl - Calibrated parameter for scaling the eddy viscosity in the curled-wake model (-) [>=0] or DEFAULT [DEFAULT=2.0 ]
DEFAULT Mod_Projection - Switch to select how the wake plane velocity is projected in AWAE {1: keep all components, 2: project against plane normal} or DEFAULT [DEFAULT=1: if Mod_Wake is 1 or 3, or DEFAULT=2: if Mod_Wake is 2] (switch)
--- VISUALIZATION ---
True WrDisWind - Write low- and high-resolution disturbed wind data to <RootName>.Low.Dis.t<n>.vtk etc.? (flag)
1 NOutDisWindXY - Number of XY planes for output of disturbed wind data across the low-resolution domain to <RootName>.Low.DisXY<n_out>.t<n>.vtk (-) [0 to 99]
90.0 OutDisWindZ - Z coordinates of XY planes for output of disturbed wind data across the low-resolution domain (m) [1 to NOutDisWindXY] [unused for NOutDisWindXY=0]
4 NOutDisWindYZ - Number of YZ planes for output of disturbed wind data across the low-resolution domain to <RootName>/Low.DisYZ<n_out>.t<n>.vtk (-) [0 to 99]
126.0, 630.0, 1008.0, 1512.0 OutDisWindX - X coordinates of YZ planes for output of disturbed wind data across the low-resolution domain (m) [1 to NOutDisWindYZ] [unused for NOutDisWindYZ=0]
0 NOutDisWindXZ - Number of XZ planes for output of disturbed wind data across the low-resolution domain to <RootName>/Low.DisXZ<n_out>.t<n>.vtk (-) [0 to 99]
0.0 OutDisWindY - Y coordinates of XZ planes for output of disturbed wind data across the low-resolution domain (m) [1 to NOutDisWindXZ] [unused for NOutDisWindXZ=0]
1.0 WrDisDT - Time step for disturbed wind visualization output (s) [>0.0] or DEFAULT [DEFAULT=DT_Low or DT_Low-VTK] [unused for WrDisWind=False and NOutDisWindXY=NOutDisWindYZ=NOutDisWindXZ=0]
--- OUTPUT ---
True SumPrint - Print summary data to <RootName>.sum? (flag)
99999.9 ChkptTime - Amount of time between creating checkpoint files for potential restart (s) [>0.0]
0.0 TStart - Time to begin tabular output (s) [>=0.0]
1 OutFileFmt - Format for tabular (time-marching) output file (switch) {1: text file [<RootName>.out], 2: binary file [<RootName>.outb], 3: both}
True TabDelim - Use tab delimiters in text tabular output file? (flag) {uses spaces if False}
"ES17.9E3" OutFmt - Format used for text tabular output, excluding the time channel. Resulting field should be 10 characters. (quoted string)
DEFAULT OutAllPlanes - Output all wake planes at all time steps. [DEFAULT=False]
7 NOutRadii - Number of radial nodes for wake output for an individual rotor (-) [0 to 20]
0, 2, 5, 11, 17, 21, 39 OutRadii - List of radial nodes for wake output for an individual rotor (-) [1 to NOutRadii] [unused for NOutRadii=0]
1 NOutDist - Number of downstream distances for wake output for an individual rotor (-) [0 to 9 ]
882.0 OutDist - List of downstream distances for wake output for an individual rotor (m) [1 to NOutDist ] [unused for NOutDist =0]
0 NWindVel - Number of points for wind output (-) [0 to 9]
0.0 WindVelX - List of coordinates in the X direction for wind output (m) [1 to NWindVel] [unused for NWindVel=0]
0.0 WindVelY - List of coordinates in the Y direction for wind output (m) [1 to NWindVel] [unused for NWindVel=0]
90.0 WindVelZ - List of coordinates in the Z direction for wind output (m) [1 to NWindVel] [unused for NWindVel=0]
OutList - The next line(s) contains a list of output parameters. See OutListParameters.xlsx for a listing of available output channels (quoted string)
"RtVAmbT1"
"RtVAmbT2"
"RtVRelT2"
"YawErrT1"
"YawErrT2"
RtSkewT1
RtSkewT2
AziSkewT1
AziSkewT2
RtSkewFiltT1
RtSkewFiltT2
AziSkewFiltT1
AziSkewFiltT2
RtGamCurlT1
RtGamCurlT2
RtVAmbFiltT1
RtVAmbFiltT2
RtCtAvgT1
RtCtAvgT2
WkAxsXT1D1"
WkAxsYT1D1"
WkAxsZT1D1"
WkPosXT1D1"
WkPosYT1D1"
WkPosZT1D1"
END
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This is low-resolution vtk file for two turbines. First one is yawed, and the second one is not yawed.
This is high-resolution vtk file of T2. No curled shape and no fully developed wake.
Thank you for your help.
Sincerely,
Wonsuk Han.
