oscillating RMS ?
 

Hi,

if the RMS values on the solver oscillate (hold around a value),what could be the cause ;poor mesh quality or simply a large timestep ,or both ?

thanks

Re: oscillating RMS ?
 

Please see the following link in this forum's FAQ for advice:

http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Good luck. Andy

Re: oscillating RMS ?
 

I had a similar problem although it was with energy balances. Refining the mesh and using double precision made a huge difference.