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July 21, 2010, 05:04 |
Comparison of simulations
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#1 |
Senior Member
Mohsin Mukhtar
Join Date: Mar 2010
Location: South Korea
Posts: 249
Rep Power: 17 |
Hello
I am doing 5 simulations. what i will do is to just change the velocity for every simulation and compare the outcome of the results. But what happens is that if i change the velcoity it takes more iterations to converge and also i have to reduce the convergence criteria. Do i need to have same iterations, same residual criteria and same under relaxation factors for comparison of my simulations or Is it posisble to give a small change to these parameters as long as the surface integrals and some other convergence criterias are fulfilled? Thank you for your time. Mohsin |
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July 21, 2010, 09:16 |
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#2 | |
Senior Member
Chris
Join Date: Jul 2009
Location: Ohio, USA
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Quote:
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July 22, 2010, 01:43 |
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#3 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,297
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For the same geometry, if you are modifiying the velocity, then you are modifiying also the Reynolds-number. Then you need to modify also turbulence BC (if you are in turbulent domain)
I can imagine that it takes more or less iterations to converge if you perturb the inlet BC. But your goal is getting a converged solution, that's all.
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