https://forums.autodesk.com/t5/cfd-forum/venturitube-inside-a-box/m-p/5888035#M20669 <P>Do you need to model the holding tank or could you just have a P=0 somewhere to represent it?</P> <P>&nbsp;</P> <P>ADV 5 should be fine here.</P> <P>&nbsp;</P> <P>The mesh is definitely going to have an effect if it is too coarse.</P> <P>&nbsp;</P> <P>Could you share a support file (CFZ)?</P> <P>&nbsp;</P> <P>Thanks!</P> <P>Jon</P> Mon, 02 Nov 2015 08:03:37 GMT Jon.Wilde 2015-11-02T08:03:37Z