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what is the actual order in a shock region

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Old   March 17, 2010, 08:14
Default what is the actual order in a shock region
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mahmoud
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Hi
I have a quick question, please
I use a second order accurate scheme to solve a problem involving a shock wave (density-based solver). I was told hat in the regions of high gradients (as in the case of shock wave), Fluent switches to a first order scheme, so the final accuarcy will be a first order anyway . Is that true?


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Old   March 17, 2010, 11:57
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Usually a high order scheme (like the one used in Fluent) uses the so called limtator functions near a shock wave - which will actually switch to a first order scheme near a shock wave.

Read any basic CFD book and you will understand exactly why we need to use limiters in these regions.

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Old   March 18, 2010, 05:53
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is there a reference in Fluent documentation for what you have just said? I've tried to search, but i can't find it...

Also i would appreciate if you could suggest some good references that deal with shock wave simulation in CFD...

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Old   March 18, 2010, 09:01
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For theory - try "Modern compressible flow" by J.D.Anderson
For CFD - "Numerical simulation of internal and external flows" by Hirsch (especially volume II).

Here is a better explanation (not written by me) of what I mean:

http://www.cfd-online.com/Wiki/Flux_limiters


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