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March 7, 2012, 02:27 |
Post Processing Drag Coefficient
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#1 |
New Member
This Wiederkehr
Join Date: Feb 2012
Posts: 2
Rep Power: 0 |
Hi all
I used OpenFoam (simpleFoam with RAS turbulence model komegaSST) to calculate the drag coefficient of a car. For calculating the drag coefficient I am using the tool forceCoeffs.so and execut it after the simulation by using: Code:
execFlowFunctionObjects -latestTime Code:
functions { #include "forceCoeffs" } and Code:
forces { type forceCoeffs; functionObjectLibs ( "libforces.so" ); outputControl timeStep; outputInterval 1; patches ( "car" ); pName p; UName U; rhoName rhoInf; // Indicates incompressible log true; rhoInf 1; // Redundant for incompressible liftDir (0 0 1); dragDir (-1 0 0); CofR (0.72 0 0); // Axle midpoint on ground pitchAxis (1 0 0); magUInf 27.8; lRef 1.0; // Wheelbase length Aref 0.94293; // Estimated Since the car is in air I changed rhoInf to 1.188. However this did not have any effect to the drag coefficient. Actually changing rhoInf to any value you'd like does not have any effect on the drag coefficient. However from my point of view this should directly influence the drag coeff. Is this a bug or did I miss something? BTW: I am using 2.0.1 Regards squanto |
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Tags |
coefficient, drag, openfoam |
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