On vorticity or angular velocity of fluid

David

Hi all,

I am puzzled by the vorticity or angular velocity of fluid. Their definitions can be found in the following link:

http://en.wikipedia.org/wiki/Vorticity

I found that in my CFD solution, the vorticity in the first cells close to wall will be much bigger than others as the fluid velocity at walls is equal to zero. This becomes more obvious when my mesh size near wall is increased. This sounds unreasonable. I wonder how it would be in in practice or experiments. In order to acquire the correct value of vorticity, I have to use fine density of grids near wall, right? Is there any other method to evaluate it during CFD simulations. I need this information for modelling others things?

I would appreciate your help.

With best regards,

David