*AEROFOIL INFO |
 
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*AEROFOIL INFO |
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To specify the aerofoil data input file information.
Refer to AeroDyn Overview for further information.
A block of two lines of data, defining the format of the tables of static aerofoil coefficients within each of the aerofoil input files as follows:
AFTABMOD=Aerofoil Interpolation, ALPHA=AoA Column, CL=Lift Coeff Column, CD=Drag Coeff Column, CM=Pitching Moment Column, CPMIN=Min Pressure Column
FILES_TO_USE=Number Aerofoil Files
This is then followed by one line of data containing the name of the first aerofoil input file. This may be repeated as often as required to define the full list of aerofoil input file names.
FILE=Aerofoil File
AeroDyn will interpolate on AoA (Angle of Attack) using the data provided via linear interpolation or via cubic splines, depending on the setting of InterpOrd input in the aerofoil input file. If Aerofoil Interpolation is set to 1, only the first airfoil table in each file will be used. If Aerofoil Interpolation is set to 2, AeroDyn will find the airfoil tables that bound the computed Reynolds number, and linearly interpolate between the tables, using the logarithm of the Reynolds numbers. If Aerofoil Interpolation is set to 3, it will find the bounding airfoil tables based on the UserProp field and linearly interpolate the tables based on it. Note that OpenFAST currently sets the UserProp input value to 0 unless the DLL controller is used and sets the value, so using this feature may require a code change.
AoA Column, Lift Coeff Column, Drag Coeff Column & Pitching Moment Column are column numbers in the tables containing the AoA (Angle of Attack), lift-force coefficient, drag-force coefficient, and pitching-moment coefficient, respectively (normally these are 1, 2, 3, and 4, respectively). If aerodynamic pitching-moment terms are neglected (via setting USEBLCM=0 under *BLADE PROPERTIES), Pitching Moment Column may be set to 0.
Min Pressure Column is the column number containing the minimum pressure coefficient for cavitation checks in hydrokinetic rotors. This feature is not yet available in AeroDyn (v15.02.04), so you should specify 0 for this entry currently.
Number Aerofoil Files specifies the number of aerofoil data input files to be used, followed by Number Aerofoil Files lines of file names.
Input: |
Description |
Aerofoil Interpolation: |
The interpolation mode for the airfoil tables. AeroDyn will interpolate on AoA (Angle of Attack) using the data provided via linear interpolation or via cubic splines, depending on the setting of InterpOrd input in the aerofoil input file. If Aerofoil Interpolation is set to 1, only the first airfoil table in each file will be used. If Aerofoil Interpolation is set to 2, AeroDyn will find the airfoil tables that bound the computed Reynolds number, and linearly interpolate between the tables, using the logarithm of the Reynolds numbers. If Aerofoil Interpolation is set to 3, it will find the bounding airfoil tables based on the UserProp field and linearly interpolate the tables based on it. Note that OpenFAST currently sets the UserProp input value to 0 unless the DLL controller is used and sets the value, so using this feature may require a code change. |
Angle of Attack Column Index: |
The number of the column in the tables of static aerofoil coefficients within each of the aerofoil input files which represents Angle of Attack. |
Lift-Force Coefficient Column Index: |
The number of the column in the tables of static aerofoil coefficients within each of the aerofoil input files which represents Lift-Force Coefficient. |
Drag-Force Coefficient Column Index: |
The number of the column in the tables of static aerofoil coefficients within each of the aerofoil input files which represents Drag-Force Coefficient. |
Pitching-Moment Coefficient Column Index: |
The number of the column in the tables of static aerofoil coefficients within each of the aerofoil input files which represents Pitching-Moment Coefficient. If aerodynamic pitching-moment terms are neglected (via setting USEBLCM=0 under *BLADE PROPERTIES), this column index may be set to zero. |
Minimum Pressure Coefficient Column Index: |
The number of the column in the tables of static aerofoil coefficients within each of the aerofoil input files which represents Minimum Pressure Coefficient (for cavitation checks in hydrokinetic rotors). This feature is not yet available in AeroDyn (v15.02.04), so you should specify zero for this entry currently. |
The total number of aerofoil input files to be used. The entry should be consistent with the number of aerofoil input file names listed under Aerofoil Files. |
Input: |
Description |
Aerofoil File Name: |
The name of the nth aerofoil input file. This entry may be repeated as often as required to define the full list of aerofoil input file names. The total number of files listed should be consistent with the Total Number of Aerofoil Input Files. |