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January 6, 2017, 03:40
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mesh independence
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#1 |
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Member
mahya
Join Date: Jul 2016
Posts: 45
Rep Power: 9  |
Hello
I have a particle in a tube And i want to cheak mesh independency What should i do? |
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January 6, 2017, 03:49
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#2 |
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Member
NGP
Join Date: Mar 2016
Posts: 33
Rep Power: 10 |
you should create new mesh 50 percent finer. run the solution. and compare the answer with previous result. if there is no change , you approach the mesh independency.
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January 6, 2017, 03:52
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#3 | |
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Member
mahya
Join Date: Jul 2016
Posts: 45
Rep Power: 9 |
Quote:
That was correct But when i change mesh My results is different from each other |
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January 6, 2017, 04:10
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#4 |
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Member
NGP
Join Date: Mar 2016
Posts: 33
Rep Power: 10 |
how many new mesh you create?
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January 6, 2017, 04:13
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#5 | |
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Member
mahya
Join Date: Jul 2016
Posts: 45
Rep Power: 9 |
Quote:
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January 6, 2017, 04:45
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#6 | |
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Member
NGP
Join Date: Mar 2016
Posts: 33
Rep Power: 10 |
Quote:
second. each meshes must be finer to the previous one, about 50 % |
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January 6, 2017, 10:51
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#7 | |
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Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,665
Rep Power: 65 |
Remesh. Rerun. Compare the results. That's the general idea. In general, the solution will change, because there is mesh dependency in the discretization. The question is how significant is the change in the result?
Look up Patrick Roache's grid convergence index for a cute method to quantify mesh dependence. Quote:
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January 8, 2017, 02:16
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#8 |
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New Member
Join Date: Dec 2016
Posts: 14
Rep Power: 9 |
Consider a tee pipe which has two inlet and one outlet let us have in one inlet pipe 5 lpm and in one inlet 7 lpm the output must be unique as 12 lpm by conservation of mass considering no internal effects. For studying mess independence we must have unique solution. Meshing and analysis of this pipe at outlet must always produce 12 lpm whatever mesh we provide we want the unique solution for studying mesh independence
Sent from my HTC Desire 526GPLUS dual sim using CFD Online Forum mobile app |
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January 8, 2017, 02:48
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#9 |
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New Member
Join Date: Dec 2016
Posts: 14
Rep Power: 9 |
Refine your mesh and retry
Sent from my HTC Desire 526GPLUS dual sim using CFD Online Forum mobile app |
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January 8, 2017, 06:41
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#10 |
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New Member
Join Date: Jun 2014
Posts: 11
Rep Power: 11 |
What are the Parameters that should kept constant?such as courent number or timestep
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