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April 9, 2011, 19:03 |
How important is clean geometry for CFD?
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#1 |
New Member
Vertex Wrangler
Join Date: Apr 2011
Location: Belgium
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I am well aware of the importance of a clean topological model when it comes to performing FEA analyses, because the mesher really has a tough time with tiny faces and short edges and other such guck.
Since CFD has more of a grid approach to discretization, does it matter as much if your geometry is clean or not? Does it also 'mesh' the model similar to finite elements or are finite difference/volume methods working entirely different? What about a solution that takes into account heat conduction in solids as well, what about then? |
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April 10, 2011, 02:48 |
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#2 | |
Senior Member
Raashid Baig
Join Date: Mar 2010
Location: Bangalore, India
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Quote:
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April 10, 2011, 10:48 |
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#3 |
Member
Join Date: Apr 2009
Posts: 36
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In my experience having a clean geometry is crucial. Without a clean geometry it is very difficult to obtain a quality mesh without some of the bad things that were mentioned in the post above.
Having those "bad things" can lead to divergence in your simulations, lack of proper convergence or poor results in those areas. |
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April 11, 2011, 20:05 |
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#4 |
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Dan
Join Date: Mar 2011
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Bad geometry is a recipe for disaster in every way.
If you have bad geometry, chances are something got messed up somewhere and no one wants to take the time to fix it. It is frustrating, but it has to be done or else you'll shoot yourself trying to debug your mesh and solutions. The question is, why WOULD you begin any type of simulation with corrupt geometry? If it's a time thing, then just be patient and fix it... you'll be better off in the end. |
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April 12, 2011, 14:28 |
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#5 |
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Vertex Wrangler
Join Date: Apr 2011
Location: Belgium
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Glad to hear it, I'm a proponent of clean models myself. Not only for the repercussions a dirty model can have - just seeing nasty topology makes me just go crazy and I want to fix it! Whether it would make any deal or not.
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April 13, 2011, 11:48 |
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#6 |
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pritish
Join Date: Apr 2010
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i can tell you...it takes double the time or more to debug a volume mesh....so have it cleaned before that ! ! !
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Pritish F1 freak |
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April 13, 2011, 11:52 |
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#7 | |
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Pauli
Join Date: Mar 2009
Posts: 189
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The other option is to throw your hands up & complain the CAD data is unusable. Since your customer likely won't want to recreate the CAD data, you run the risk of losing business to someone who will work through bad CAD data. |
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April 13, 2011, 21:44 |
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#8 | |
New Member
Dan
Join Date: Mar 2011
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Quote:
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Tags |
discretization, mesh, topology |
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