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[CFD-Post] Mass Flow through an arbitrary surface

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Old   November 27, 2015, 08:57
Default [CFD-Post] Mass Flow through an arbitrary surface
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I am modelling a centrifugal compressor with a splitter blade.
I want to see how much air goes through each part ("left" and "right" from the splitter).
I have tried for 1 day now, but have not any progress.
Here are some questions:

1) How to make 2 surfaces which cover each channel right at the end of the blades?

I have tried Turbo Surface (Constant Blade Aligned) which gives the best result as I can move it to the very edge of the blades. But the mesh is not parallel to the TS.

I have tried Surface Group, composed of some small primitives. On that SG I can get a sane Mass Flow Contour.
But this Group if moved (to the edge of the blades), also crosses cells at an angle and makes nonsense for Contour Mass Flow.

2) Also, I cant separate that TS in 2 parts - one for each channel.
Tried User Surface made of Cross section, but didn't get any further. User Surface still covers both passes.

3) How to display mass flow (contour) at those surfaces. If I do Contour -> Mass Flow on the TS, I get wrong results, because TS is not parallel to the mesh.

The integral mass flow through a surface is more or less clear. But I have to get 2 surfaces at the exit first (question #1).

Thanks in advance.
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centrifugal compressor, cfd-post, mass flow

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