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April 13, 2012, 22:49 |
Structured or Unstructured???
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#1 |
Member
Join Date: Oct 2011
Location: OH, USA
Posts: 77
Rep Power: 14 |
I'd appreciate it if someone answers this question:
is fluent a "structured" or "unstructured" solver? |
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April 16, 2012, 02:03 |
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#2 |
Senior Member
Join Date: May 2011
Location: Germany
Posts: 130
Rep Power: 15 |
unstructured
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April 16, 2012, 14:19 |
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#3 |
Member
banty
Join Date: Mar 2012
Posts: 52
Rep Power: 14 |
What do u mean by structure and unstructured. it is in sense of mesh?
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April 16, 2012, 14:38 |
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#4 |
Senior Member
Join Date: May 2011
Location: Germany
Posts: 130
Rep Power: 15 |
http://www.innovative-cfd.com/cfd-grid.html
unstructured solver can handle both structured and unstructures mesh structured solver can handle only structires mesh but i actually only know unstructured solver |
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April 16, 2012, 21:22 |
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#5 | |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,676
Rep Power: 66 |
Quote:
structure/unstructure can refer to both grids and solvers. He asked specifically for the solver. |
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April 16, 2012, 21:27 |
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#6 |
Member
Join Date: Oct 2011
Location: OH, USA
Posts: 77
Rep Power: 14 |
thanks everybody
I dont know why there isnt any option to switch to STRUCTURED solver in fluent |
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April 16, 2012, 21:47 |
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#7 | |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,676
Rep Power: 66 |
Quote:
Structured solvers are severely limited in the types of problems they can solve, which means commercially it is not very viable. And then throw on top of that the difficulty in obtaining a structured mesh for the same problem. Recall that unstructured meshes allow significantly better grid quality and reduced grid size (at the expense of some storage memory for the grid). For complex geometries, the savings that you would have otherwise obtained by using a structured mesh + solver are not worth it you end up need a bigger mesh regardless. Structured meshes are really only viable for very simple geometries. Given the computing power of modern computers (and memory available), not many people bother. |
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April 19, 2012, 09:38 |
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#8 |
Senior Member
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Grid topology can be structured (single block, multiblock) or unstructured. Then the grid information can be saved in a structured way (only structured grids) or an unstructured way (both structured and unstructured).
The way you save the grid information is related to the way your solver is expecting it. Fluent is an unstructured solver, which means it stores and reads the grid information in unstructured format. This does not means you can't use a structured grid in Fluent but simply that it is stored as an unstructured grid so, at the code level, all the grid read by Fluent are unstructured (and the numerical methods used on them are limited by this). You don't have any switch in Fluent because it only reads grids written in unstructured format (either they were originally structured or not). |
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