# new to CFD and have a simple question about models

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 April 20, 2012, 14:05 new to CFD and have a simple question about models #1 New Member   Benjamin Kim Join Date: Apr 2012 Location: Philadelphia, Pennsylvania Posts: 6 Rep Power: 5 I am a 2nd year student at university studying engineering. I have absolutely no formal training or experience with CFD yet but I am interested in the aerodynamics field. My question is why is it common to use only half of the model for analysis? I was told that analyzing a symmetrical half of complex models reduces CPU power. Is that true? Thanks.

April 20, 2012, 14:11
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Quote:
 Originally Posted by bjk87 I am a 2nd year student at university studying engineering. I have absolutely no formal training or experience with CFD yet but I am interested in the aerodynamics field. My question is why is it common to use only half of the model for analysis? I was told that analyzing a symmetrical half of complex models reduces CPU power. Is that true? Thanks.
well, the answer to your question is pretty straightforward: If the flow is symmetric about a certain axis, then yes, it is often common to model only half of the flow. Why? because the other half (the one you are not computing) would just give you the same results (mirrored) than the one you are actually modelling.

Two assumptions behind this:
a) the flow is indeed symmetric to a given axis/plane
b) your code has symmetry boundary conditions you can apply to the "cut"

Hope this clears it up!
Cheers!

 April 20, 2012, 14:16 #3 New Member   Benjamin Kim Join Date: Apr 2012 Location: Philadelphia, Pennsylvania Posts: 6 Rep Power: 5 Thank you. This was just one of the things I have been curious about.

April 20, 2012, 14:18
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Quote:
 Originally Posted by bjk87 Thank you. This was just one of the things I have been curious about.

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