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confusion in specifying domain flow direction and results

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Old   February 26, 2015, 01:59
Default confusion in specifying domain flow direction and results
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ashwani
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hi,
i m doing a problem on steam flow across a rotor blade

at inlet i have used the flow direction as normal to boundary condition, but how can i provide an angle for steam flow at inlet ( picture attached)

also in results for velocity, i m getting a vortex or reversed flow kind of situation across fluid domain, is there something wrong or it is ok ( picture attached)

thankyou
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Old   February 26, 2015, 02:01
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Old   February 26, 2015, 05:21
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Glenn Horrocks
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I see lots of major issues:

* You appear to be modelling the blade as a solid region. You do not need to do this unless you intend to model heat transfer in the blade. Most people model blades as a hollow in the fluid domain. Refer to the tutorials for how to set this up.
* Your top and bottom boundaries do not appear to be periodic boundaries. Refer to the tutorials for how to set this up.
* You will get massive separations if you run the device far from its design operating point. But only worry about this point after you have fixed up the other two points.
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Old   February 27, 2015, 11:29
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thanks for replying
i m actually doing heat transfer analysis with initial cond's:
total temp: 425 C, total pressure: 17 bars
outlet cond's: 14 bar ( static temp)
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Old   February 28, 2015, 07:45
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OK, if you are modelling heat transfer in the blade then model the blade as a solid body.

But the other two points still hold.
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