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-   -   Structured / Unstructured (http://www.cfd-online.com/Forums/main/8069-structured-unstructured.html)

Bob September 9, 2004 17:57

Structured / Unstructured
 
What is the difference really? Some people say unstructured grids give more accurate solution to the fluid flows. Is that true? We know that it is more difficult to write codes based on unstructured grids, but what is the most important benefit of unstructured grids? Thanks.

Junseok Kim September 10, 2004 01:07

Re: Structured / Unstructured
 
In a lot of case, interests are local, so we want to resolve the local area by putting a lot of mesh points in there. This can be naturally done with unstructured grids.

On the other hand, if we use structure grids, we may waste computational effort in unnecessary parts. But if you use adaptive structured grids, we can relieve this and get accurate calculation also.


chen25 September 10, 2004 02:44

Re: Structured / Unstructured
 
I don't think unstructured grids will give more accurate solutions than structured grids. There are many other factors that affect the accuracy more. The major advantage of using unstructured grids is certainly the ease of meshing domains of various shapes.

User September 10, 2004 17:22

Re: Structured / Unstructured
 
Really agree with chen25. Easy meshing is THE advantage of unstructured mesh.

Thomas September 12, 2004 10:40

Re: Structured / Unstructured
 
Hi Junseok,

I am interested in your comment on local area need to be given more node points. I agree with you, but am not sure how important the upstream contribute to local flow. Could you please give me some references on this.

Thanks, Thomas

Junseok Kim September 12, 2004 12:44

Re: Structured / Unstructured
 
What I meant by local area is in the multi-phase flow, in many cases, we want to track the interface location and most of computational details are needed at that interface region such as velocity, pressure, and surface tension.

Would you please visit our group's research publication page.

http://math.uci.edu/~cristini/publications.php

Thanks

Blorg September 13, 2004 04:19

Re: Structured / Unstructured
 
I'd say meshing is no problem in a commercial cfd code using structured meshing. The answer is STL files and a CAD program...


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