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CFX: Transient sim with fluid-fluid domain interface

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Old   April 3, 2010, 11:44
Default CFX: Transient sim with fluid-fluid domain interface
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Fidel Arzola
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Hello all,
I'm simulating a Kaplan hydraulic turbine. I got a good convergence in steady state, but I'm studying unsteady flows and of course is needed to carry out transient simulations.

I'm using a fifth part of runner subdomain and a complete draft tube geometry (the water conduit to the exit), this is equivalent to said a pitch angle for side one equal to 72 degrees and a pitch angle for side two equal to 360 degrees. Then I can see a very good behavior of oscillations due to blade passage frequency in the outlet of the runner but it didn't pass to the draft tube subdomain . So, what's happens? From the draft tube point of view it's as the fifth part of runner is a total water passage way.

Someone can give me a recommendation to try to solve it.
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Old   April 4, 2010, 07:34
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Glenn Horrocks
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Sorry, I don't understand your question.
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Old   April 6, 2010, 12:05
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Bruno
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Fidel,
Did you remember to check the pitch change on the rotor-draft tube interface? That seems to be the problem.
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Old   April 6, 2010, 12:07
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Bruno
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Fidel,
From what you said you have two domain interfaces. Did you check the pitch change on both of them?
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Old   April 7, 2010, 15:08
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Fidel Arzola
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Quote:
Originally Posted by brunoc View Post
Fidel,
Did you remember to check the pitch change on the rotor-draft tube interface? That seems to be the problem.
I'm setted a pitch change between rotor and draft tube equal to 72/360 and a pitch change between distributor and rotor equal to 15/72. Is that correct?
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interface domains, pitch angle, transient simulation, turbine blade

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