[giannantoni10]

Hi dear,

I'm working in a simulation with Star CCM+; I have a centrifugal fan cooling an electronic board and a heat sink with two different "pressure outlet".

I have a problem, because the iteration say me "reversed flow on inlet and outlet".

So, I would know if there is some problem on simulation setting or the the turbolence effect the flow direction.

N.B. I read a lot of post and I tried to extrude the outlet ducts, I tried refinement mesh, I tried "flow split outle" instead "pressure outlet" but he results are the same.

I attached an image with the velocity vector field on section plane

Thank's all.

[ping]

looks like you need to extrude much further to prevent the reverse flow - they can be progressively much bigger cells by using the extruder carefully and the warning is not related to turbulence but is due to recirculation