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September 26, 2012, 10:08 |
I want to restore Adapted mesh..
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#1 |
Member
Chris, Kam
Join Date: Nov 2010
Location: Busan, South Korea
Posts: 42
Rep Power: 15 |
Hi all
These day, I use fluent to analysis supersonic CD nozzle flow, and I used 'adapt mesh' in order to identify Mach disk Mesh around the Mach disk was refined as i wished, the problem is that, Mach disk was Moved so I want to refine another place and restore refined mesh to original one The question is "Can I restore adapted mesh as original mesh??" thanks for your kind attention, and wait for your reply |
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September 26, 2012, 21:01 |
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#2 |
Member
NormalVector
Join Date: Oct 2010
Posts: 71
Rep Power: 15 |
No, I was under the impression that you cannot restore to the initial mesh after adaptation. I think the Fluent manual even says to be sure to save an instance of the original mesh in case adaptation goes sour. Do you have a saved case of your pre-adaption mesh?
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September 27, 2012, 08:04 |
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#3 |
Member
Chris, Kam
Join Date: Nov 2010
Location: Busan, South Korea
Posts: 42
Rep Power: 15 |
thanks, NormalVector
so .. what can I do is... ---------------------------------- save case before adaption -> adapt the mesh -> calculate with adapted mesh -> read the case -> adapt again -> iterate ---------------------------------- again, I appreciate your kind answer |
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September 28, 2012, 11:49 |
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#4 |
New Member
Jared Brewer
Join Date: Dec 2009
Location: New Orleans, La
Posts: 7
Rep Power: 16 |
The movement of the mach disk is supposed to happen because as you adapt your mesh your solution becomes "less mesh dependent" (more physically accurate). If you try the procedure you list, your solution validity will most likely suffer. If you try to impose the "correct" solution on a mesh that is not "correct" all kinds of strange things can happen. The correct way to go about this is to both refine and coarsen using adaptive meshing.
For instance, in your adaptive mesh option interface, you select to adapt based on the *NORMALIZED GRADIENT* of static pressure (*hint hint Ive done at least 40-50 adaptive mesh rocket nozzle/plume simlulations at a professional level) to a refinement tolerance of 0.7 (since normalization makes everything between 0-1). You should also set the coarsen tolerance to a value of 0.3. That way your range of 0.3-0.7 dictates that if there is a static pressure gradient steeper than 70%+ of all of the gradients calculated in the field, refine this area. As your mach disk moves, the coarsen threshold implies that if there is an area of the field with static pressure gradients in the weakest 30%, coarsen these. This technique is one that I use for near all high speed combustion flows. It is especially helpful with transient simulations where your flame front is continuously moving. Hope this clears things up. Let me know what you think, -J |
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September 28, 2012, 12:27 |
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#5 | |
Member
NormalVector
Join Date: Oct 2010
Posts: 71
Rep Power: 15 |
Quote:
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