How can I calculate the drag coeficient of a circular cylinder?
Search at this site.i saw a comlete thread about lift and drag cefficients here.
You have to insert the function forceCoeffs into your control.dict. in the folder system.
Here is a example:
patches (patchname); //change to your patch name of the cylinder
rhoInf 1.225; //Density of the fluid
CofR (0 0 0);
liftDir (0 0 1);
dragDir (1 0 0);
pitchAxis (0 1 0);
magUInf 0.0243243243; //velocity
lRef 0.0555; //reference length for forces
Aref 1.11e-3; //reference surface of the cylinder
outputInterval 10; //every x timesteps =>one drag coefficient
Then you are able to calculate the drag coeficients
Hope that helps
I'm a newbie in OpenFoam.
I try and it works.
Now the problem is that the value of cd is too high in compare with the academics work there i saw.
Perhaps you know what's my problem.
Is your case LES or RAS?
Have you modified a existing tutorial?
Have you checked your boundary conditions?
Can you upload your case, that i can have a look?
I am doing LES cd calculations of a 2d cylinder, at the moment.
My case is RAS,
The cd is too high,
Can you take a look?
I think your epsilon value is too high.
Your value is 1.01.
With a viscosity of 1e-3 and a velocity of 0.2 m/s is should imho be much smaller.
Have you solved the problem?
i can't solve the problem.
now I'm in exams, and I haven't been working on the problem.
you got see any errors in my files.
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