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conservative or non conservative, Is there a big difference? |
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January 4, 2015, 11:37 |
conservative or non conservative, Is there a big difference?
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#1 | |
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 849
Rep Power: 18 |
Hi guys,
Im using twoPhaseEulerFoam to simulate. we can see that in the latest version of OpenFOAM, this two-fluid model is rewritten into conservative form. before this, its non-conservative form. Right now I know by doing some mathematical rearranging, this two form equations can be the same. for example, see this formula: by adding the term in the middle into non conservative form equation, we can get the conservative form equation. So that means conservative and non-conservative equations can be converted. But Im confused why sometimes we use non-conservative or conservative form to solve. Besides, we should expect non-conservative and conservative's result should be the same rite? I quote this from Henry: Also the fact that 2.3.x is conservative and 2.2.x isn't will affect the results. can anybody explain this to me? because from formula, there two form's equation are the same one. Also, I see Alberto is working on this solver to make it conservative, see this: Quote:
Waiting for any kind of discussion. Thanks. |
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April 10, 2015, 05:19 |
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#2 |
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 849
Rep Power: 18 |
I tried to do a comparison with FLUENT, Im sure 22x's result is better(non-conservative equations)
This happens on stirred tank using MRF. |
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