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Old   July 31, 2007, 08:17
Default symmetry....
  #1
oxalis
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Hi,

I simulate only half of my model, to reduce the grid needed. I use symmetry BC on the cutting axis (z).

My questions are:

1. in reference value, should I set the area as the area of the whole model (A) or only the area that I simulate (0.5 A)?

2. does fluent calculate the force for the whole model or only what I simulate (0.5 model) ?

3. is there any tutorial about this that I can refer to?

Thanks a bunch

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Old   July 31, 2007, 09:51
Default Re: symmetry....
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Joe
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only what I simulate (0.5 model)
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Old   July 31, 2007, 10:30
Default Re: symmetry....
  #3
oxalis
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thank you joe

really appreciate your answer
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Old   July 31, 2007, 15:07
Default Re: symmetry....
  #4
AAA
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Hi

1) Is your model 2 or 3D?

2) Since a symmetry BC is nothing but a wall with a "slip" condition on it (as aopposed to a wall BC where the "no-slip" condition is applied on the wall), I presume that Fluent caculates the force for that specific domain.

3) The tutorial about flow in a tube bundle (heat exchanger) might help.

Regards

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Old   July 31, 2007, 23:01
Default Re: symmetry....
  #5
oxalis
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Hi,

my model is 3D.

if I model only half. I need to multiply the result by 2? so, the assumption is that both part (0.5 + 0.5 model) generate the same lift, drag and moment?

thanks for the reference
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Old   July 31, 2007, 23:09
Default Re: symmetry....
  #6
oxalis
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i can't find the tutorial in fluent documentation. what is the tutorial number?

or can you give me a link.

thank you
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