# symmetry....

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 July 31, 2007, 08:17 symmetry.... #1 oxalis Guest   Posts: n/a 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

 July 31, 2007, 09:51 Re: symmetry.... #2 Joe Guest   Posts: n/a only what I simulate (0.5 model)

 July 31, 2007, 10:30 Re: symmetry.... #3 oxalis Guest   Posts: n/a thank you joe really appreciate your answer

 July 31, 2007, 15:07 Re: symmetry.... #4 AAA Guest   Posts: n/a 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

 July 31, 2007, 23:01 Re: symmetry.... #5 oxalis Guest   Posts: n/a 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

 July 31, 2007, 23:09 Re: symmetry.... #6 oxalis Guest   Posts: n/a 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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