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June 23, 2010, 11:22 |
Friction coefficients using icoFoam
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#1 |
New Member
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Hello everyone,
I need to plot the friction coefficient using icoFoam solver on a flat plate. I tried to add the following lines at the end of /system/controlDict, but an error appears when calling "icoFoam" : functions ( forces { type forces; functionObjectLibs ("libforces.so"); patches (wall); rhoInf 1000; CofR (0 0 0); } forceCoeffs { type forceCoeffs; functionObjectLibs ("libforces.so"); patches (wall); rhoInf 1000; CofR (0 0 0); liftDir (0 1 0); dragDir (1 0 0); pitchAxis (0 0 0); magUInf 0.13; lRef 1; Aref 1; } ); The error : Create time Create mesh for time = 0 Reading transportProperties Reading field p Reading field U Reading/calculating face flux field phi Courant Number mean: 0 max: 0.052 Starting time loop keyword outputControl is undefined in dictionary "::functions::forces" file: ::functions::forces from line 59 to line 63. From function dictionary::lookupEntry(const word&, bool, bool) const in file db/dictionary/dictionary.C at line 388. FOAM exiting Can someone help me with this problem please ? (Maybe there is another way to output the friction coefficient ?) Thanks |
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August 21, 2010, 06:25 |
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#2 |
New Member
Join Date: Mar 2010
Location: Germany
Posts: 10
Rep Power: 16 |
Hi,
I have the same error after starting "icoFoam". Is it possible that it is not sufficient to make the entry in the system/controlDict for the forces and force coefficients like wjarrah it done? Must I change also other files from the solver or so? Thanks for your help! Alex |
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August 21, 2010, 07:18 |
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#3 |
New Member
Join Date: Mar 2010
Location: Germany
Posts: 10
Rep Power: 16 |
I solved the problem with the help of other threads and forums. It is not necessary to change anything else then the controlDict. Here are the additional lines for the controlDict:
functions ( forces { type forces; functionObjectLibs ("libforces.so"); rhoInf 1.0; patches ( ELLIPSOID.1 ); CofR (0 0 0); outputControl timeStep; outputInterval 1; } forceCoeffs { // rhoInf - reference density // CofR - Centre of rotation // dragDir - Direction of drag coefficient // liftDir - Direction of lift coefficient // pitchAxis - Pitching moment axis // magUinf - free stream velocity magnitude // lRef - reference length // Aref - reference area type forceCoeffs; functionObjectLibs ("libforces.so"); patches (ELLIPSOID.1); rhoName rhoInf; rhoInf 1.0; CofR (0 0 0); liftDir (0 0 1); dragDir (0 1 0); pitchAxis (0 0 1); magUInf 0.1; lRef 0.0004; // ellipsoid max diameter Aref 6.283e-8; //projected area from ellipsoid outputControl timeStep; outputInterval 1; } ); It creates a directory for the forces and force coefficients in your case. Alex |
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