Corrugated pipe, accelerated flow
 

Dear foam folks,

I have created a wedge geometry for a corrugated pipe - and experience severe issues using simpleFoam when the corrugated section is long, say 20 diametres. As can be seen from attached screenshot, the velocity is "too high" at outlet - here 0.5m/s, while boundary at inlet is mere 0.1m/s. I have tried to keep BC's somewhat similar to pitzDaily. What may cause these problems? I have already tried to make mesh coarser, upwind and linearUpwind in fvSchemes, and ramp up relaxation parameters from ~0.2.

Thanks.