[quarkz]

Hi,

I'm simulating a rather simple flow past airfoil naca0012 case.

The airfoil is pitched up to 20deg. Re = 100.

Although I think it is most likely a steady flow, I still use pimpleFoam instead of simpleFoam.

However, I got force drag results oscillating between +/- 100. This is clearly wrong. I changed some parameters in different files and found that increasing nOuterCorrectors to 10 solves the problem. Even at 3, the result is wrong.

Is this expected? Cos in other more complicated simulations which I do - 3D, unsteady, moving bodies, I use nOuterCorrectors = 1 and I didn't encounter this problem.

So I'm wondering why it happens to such a small simple problem?

In the wiki on pimpleFoam (https://openfoamwiki.net/index.php/O...hm_in_OpenFOAM)

it is mentioned that to use large time steps, nOuterCorrectors has to be increased to 50 or more. However, I'm only using CFL = 1 and my time step is small.

Can anyone explain this? Btw, I'm using OF2206.

Thanks