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Alternate rotation method

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Old   February 12, 2020, 12:18
Default Alternate rotation method
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Sai Paruchuri
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I am simulating flow through an axial pump (by specifying total pressure at inlet and static pressure at outlet), so bulk of the flow is moving in the axial direction. I observe some spurious vectors in the blade tip gap and swirl at the interface between rotating and stationary domain. Also the flow rate is much less than measured value. For a coarse mesh, when I turned on the alternate rotation method, it seemed to correct the flow vectors and the flow rate value. However, with a fine mesh, the swirl continues to exist and the simulation gives a low flow rate despite turning on the alternate rot method. Kindly help me understand what's happening!
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Old   February 12, 2020, 13:38
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Gert-Jan
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We need a screendump to really make a good comment.
However, a mistake people quite often make is that they judge this kind of simulation by looking at the vectors and flow with variable "Velocity". I suggest to look at "Velocity at Stn Frame"

Last edited by Gert-Jan; February 12, 2020 at 16:27.
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