CFX: Transient sim with fluid-fluid domain interface

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 April 3, 2010, 11:44 CFX: Transient sim with fluid-fluid domain interface #1 New Member   Fidel Arzola Join Date: Mar 2010 Location: Venezuela Posts: 5 Rep Power: 8 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. __________________ Thanks, Fidel

 April 4, 2010, 07:34 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,638 Rep Power: 98 Sorry, I don't understand your question.

 April 6, 2010, 12:05 #3 Senior Member   Bruno Join Date: Mar 2009 Location: Brazil Posts: 273 Rep Power: 13 Fidel, Did you remember to check the pitch change on the rotor-draft tube interface? That seems to be the problem.

 April 6, 2010, 12:07 #4 Senior Member   Bruno Join Date: Mar 2009 Location: Brazil Posts: 273 Rep Power: 13 Fidel, From what you said you have two domain interfaces. Did you check the pitch change on both of them?

April 7, 2010, 15:08
#5
New Member

Fidel Arzola
Join Date: Mar 2010
Location: Venezuela
Posts: 5
Rep Power: 8
Quote:
 Originally Posted by brunoc 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?
__________________
Thanks,
Fidel

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