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Old   March 13, 2007, 00:35
Default To turbomachinery experts & representatives
  #1
sam
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Dear freinds,

I am simulating the two turbine stage: High pressure and low pressure rotating in oppositve direction namely +ve Z axia and -ve Z axis.

I would like to ask the question how to give the boundary condition to fluid for this setup i.e two turbine rotating in opposite dirction.

Should i set +ve rotating direction for one and -ve rotating direction for other. when i do like this i get severe divergence.

Please help I am stuck up in my thesis work and it is last part of my work Regards SAM

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Old   March 13, 2007, 06:32
Default Re: To turbomachinery experts & representatives
  #2
A.S.
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Which code are u using
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Old   March 14, 2007, 03:18
Default Re: To turbomachinery experts & representatives
  #3
sam
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I am using Fluent and mixing plane model But I have no idea what to do when simulating couterrotating turbine. Do I need some special UDF?

Regards Sam
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Old   March 14, 2007, 16:20
Default Re: To turbomachinery experts & representatives
  #4
Ahmed
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User Coordinate Systems
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Old   March 15, 2007, 00:51
Default Re: To turbomachinery experts & representatives
  #5
sam
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Dear A.S and Ahmed, thanks for your reply. But still i have problem in simulating two turbine on different shafts and rotating in different directions (i.e opposite to each other). I am facing high level of divergence.

I am looking for more comments and experts opinion from all users of cfd online and representatives of commercial cfd software vendors.

p.s 1. I have simulated both of them in isolation with succesful results. 2. What is meant by user coordinate system.

Regards
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