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Tangential component of velocity

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Old   September 7, 2018, 22:08
Default Tangential component of velocity
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Marcello Asciolla
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Good evening, I am a beginner in CFD field and I am trying to simulate the flow of a stage of a compressor in CFX.

There is a basic thing that I can not understand when I use the rotating domain technique, maybe it is also a limitation of it, but I am not sure.

After the analysis the axial component of velocity is always continuous, while the tangential one is always discontinuous, as we see in the figure.
I hesitate to say something about the radial one, because it is difficult to see it in post-processing with plans, but it seems to be continuous too.

u.JPG

Do I have to consider it as a common thing, because I can imagine that the thecnique was born for an isolated fan, in which most of the times we focus the attention only on the axial component and the other ones are neglected?
I say this because in the case I am studying the radial and tangential components are very important (I have a stage of a compressor with a mixed flow radial-axial rotor and an axial stator) and I can not allow them to magically disappear, because this thing goes to distort the calculation of the flow rate and a stator downstream of the rotor would read a different angle of attack.

In summary: do I have to see this fact as a limitation of this technique?
And, if this is correct, is there an alternative or a way to obtain these two components?
Any help?
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Old   September 8, 2018, 07:48
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