Dear Jason,
Thank you for the help. I updated to OpenFASTv3.0.0, but I still got the weird turbulence of the wake at the second turbine. It seems to be converging after a long simulation time (I took Tmax=2500s for a wind speed of 10m/s). Here is the input file, the output simulation visualization, and the output power and thrust coefficient of each turbine:
FAST.Farm input file:
FAST.Farm v1.00.* INPUT FILE
Sample FAST.Farm input file
--- SIMULATION CONTROL ---
False Echo Echo input data to <RootName>.ech? (flag)
"FATAL" AbortLevel Error level when simulation should abort (string) {"WARNING", "SEVERE", "FATAL"}
1000 TMax Total run time (s) [>=0.0]
True UseSC Use a super controller? (flag)
2 Mod_AmbWind Ambient wind model (-) (switch) {1: high-fidelity precursor in VTK format, 2: InflowWind module}
--- SUPER CONTROLLER --- [used only for UseSC=True]
"SC_DLLnew.dll" SC_FileName Name/location of the dynamic library {.dll [Windows] or .so [Linux]} containing the Super Controller algorithms (quoated string)
--- AMBIENT WIND ---
2.0 DT 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 Time step for high-resolution wind data input files (s) [>0.0]
"Unused" WindFilePath Path name to 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]
2.0 DT 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]
201 NX_Low N130umber of low -resolution spatial nodes in X direction for wind data interpolation (-) [>=2]
61 NY_Low Number of low -resolution spatial nodes in Y direction for wind data interpolation (-) [>=2]
17 NZ_Low Number of low -resolution spatial nodes in Z direction for wind data interpolation (-) [>=2]
0.0 X0_Low Origin of low -resolution spatial nodes in X direction for wind data interpolation (m)
-300.0 Y0_Low Origin of low -resolution spatial nodes in Y direction for wind data interpolation (m)
10.0 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]
10.0 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]
35 NX_High Number of high-resolution spatial nodes in X direction for wind data interpolation (-) [>=2]
45 NY_High Number of high-resolution spatial nodes in Y direction for wind data interpolation (-) [>=2]
17 NZ_High Number of high-resolution spatial nodes in Z direction for wind data interpolation (-) [>=2]
"WakeEffect_inflow_nFF_Var.dat" InflowFile Name of file containing InflowWind module input parameters (quoted string)
--- WIND TURBINES ---
2 NumTurbines Number of wind turbines (-) [>=1] [last 6 columns used only for Mod_AmbWind=2]
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)
126 0 0.0 "WakeEffect_WT1_nFFlit.fst" 100 -150 10.0 10.0 10.0 10.0
1134.0 0.0 0.0 "WakeEffect_WT2_nFFlit.fst" 1108.0 -150.0 10.0 10.0 10.0 10.0
--- WAKE DYNAMICS ---
2.0 dr Radial increment of radial finite-difference grid (m) [>0.0]
110 NumRadii Number of radii in the radial finite-difference grid (-) [>=2]
130 N63umPlanes N130umber of wake planes (-) [>=2]
DEFAULT f_c Cut-off (corner) frequency of the low-pass time-filter for the wake advection, deflection, and meandering model (Hz) [>0.0] or DEFAULT [DEFAULT=0.0007]
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= 0.3 ]
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=-0.004]
DEFAULT C_NearWake Calibrated parameter for the near-wake correction (-) [>1.0] 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]
DEFAULT C_Meander Calibrated parameter for wake meandering (-) [>=1.0] or DEFAULT [DEFAULT=1.9]
--- VISUALIZATION ---
False 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 9]
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]
0 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 9]
748.0, 1252.0, 1378.0, 1504.0, 1630.0, 1756.0, 1882.0, 2008.0 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 9]
126.0, 504.0 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]
20.0 WrDisDT Time step for disturbed wind visualization output (s) [>0.0] or DEFAULT [DEFAULT=DT] [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}
"ES10.3E2" OutFmt Format used for text tabular output, excluding the time channel. Resulting field should be 10 characters. (quoted string)
16 NOutRadii Number of radial nodes for wake output for an individual rotor (-) [0 to 20]
0, 2, 4, 8, 9, 11, 13, 15, 17, 19, 21, 24, 28, 33, 50, 64 OutRadii List of radial nodes for wake output for an individual rotor (-) [1 to NOutRadii] [unused for NOutRadii=0]
8 NOutDist Number of downstream distances for wake output for an individual rotor (-) [0 to 9 ]
0.0, 378.0, 504.0, 630.0, 756.0, 882.0, 1008.0, 1134.0 OutDist List of downstream distances for wake output for an individual rotor (m) [1 to NOutDist ] [unused for NOutDist =0]
1 NWindVel Number of points for wind output (-) [0 to 9]
126.0 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)
"RtAxsXT1 , RtAxsYT1 , RtAxsZT1"
"RtPosXT1 , RtPosYT1 , RtPosZT1"
"YawErrT1"
"TIAmbT1"
"RtVAmbT1, RtVAmbT2"
"WkPosXT1D1 , WkPosXT1D2 , WkPosXT1D3 , WkPosXT1D4 , WkPosXT1D5 , WkPosXT1D6 , WkPosXT1D7, WkPosXT1D8"
"WkPosYT1D1 , WkPosYT1D2 , WkPosYT1D3 , WkPosYT1D4 , WkPosYT1D5 , WkPosYT1D6 , WkPosYT1D7, WkPosYT1D8"
"WkDiamT1D1 , WkDiamT1D2 , WkDiamT1D3 , WkDiamT1D4 , WkDiamT1D5 , WkDiamT1D6 , WkDiamT1D7, WkDiamT1D8"
END of input file (the word "END" must appear in the first 3 columns of this last OutList line)
FAST.Farm output power and thrust coefficient:
FAST.Farm vizualization:
I hope this will make things clearer.
Kindest regards
Younes
