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How to find Cd & Cl in Motorcycle tutorial

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Old   April 24, 2011, 06:33
Default How to find Cd & Cl in Motorcycle tutorial
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Athirach Phoniam
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Hello,
Iím a new OpenFoam user

since I'm able to configure an run simple OpenFoam cases
, I went through the motorBike tutorial Everything worked .So I donít know how to find Cd(drag coefficient) and Cl(lift coefficient) on this tutorial .I would be thankful if there anyone who can help me.
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Old   April 24, 2011, 16:00
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Greg Givogue
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Here is another example of the forces utility parameters that you need to edit for the motorBike Tut and add to the end of the controlDict file.

functions
(
forces
{
type forces;
functionObjectLibs ("libforces.so"); // lib to load
patches (pod); // patch name. for multiple patches, seperate patch names by a space
pName p;
UName U;
rhoName rhoInf;
log true;
rhoInf 1.225; // Reference density for fluid - changed to SL air from 1.204
CofR (0.5588 0 -0.635); //for moment calc
outputControl timeStep;
outputInterval 1;
}

forceCoeffs
{
type forceCoeffs;
functionObjectLibs ("libforces.so");
patches (pod);
pName p;
UName U;
rhoName rhoInf;
log true;
rhoInf 1.225;
CofR (0.5588 0 -0.635); //edit for Cm
liftDir (0 0 -1);
dragDir (-1 0 0);
pitchAxis (0 1 0);
magUInf 89.41;
lRef 9.8; // ref length
Aref 2.2; // X-section of body
outputControl timeStep;
outputInterval 1;
}
);
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Old   April 25, 2011, 11:20
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Athirach Phoniam
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Thank you very much
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