Hi everyone, I am studying
I am studying 2D flow around a cylinder. Wind is coming along the x (horizontal) axis. Since I am interested in the drag and lift on the cylinder, I am extracting the pressure and viscous stresses on the cylinder, and computing lift and drag with the forceCoeffs functionObject.
I get viscous stress sigmayy around 10E-20 at any point of the cylinder, whereas sigmaxx and sigmaxy have significant values. To check if sigmayy should actually be zero, I decided to change the wind direction so that it is now along the y axis. I have again in this case significant values for sigmaxx and sigmaxy, and still zero values for sigmayy. The non-zero values for sigmaxx seems to confirm that sigmayy should not be zero.
Further integrating pressure forces and viscous stresses sigmaxx and sigmaxy over the cylinder, I can match the force along x given by forceCoeffs in both cases. However, I cannot match the force along y, which involves sigmaxy and sigmayy. The relative error is significant (around 25%).
simpleFoam, laminar case
UNIX 64 bit
Thanks for your answer,
There is a possibility that th
There is a possibility that this issue relates to problems with the symmTensor operators in 1.5 which have already been fixed in 1.5.x so it might be worth giving that a try. If you don't have any luck with 1.5.x could you please post the case here so we can look at the issue in more detail?
Thanks for the information, we
Thanks for the information, we are trying to install git and update to 1.5.x
I will post the results,
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