Force by buoyancy
 

Dear all,

The difference in Buoyancy forces switched on or off have a major influence on the forces in my bouyancy direction of my model. For that reason I modelled a simple isothermal, single phase 2D cylinder flow, but still the buoyancy has a major influence. When switched off I get a drag force of -0.33N and when switched on I get a drag force of 0.70N.

Epecially the negative drag force is very weird, anyone an explanation?

nobody an idea?

found the answer: pressure build op due to the domain (to small)!

For future reference: The reason you got no replies is because you did not provide sufficient information about what you were doing and any error messages, convergence histories or anything to debug the problem. We are not mind readers. So I just don't bother answering questions which are poorly asked. I have better things to do.

thanks for the tip! :)