|July 21, 2010, 05:04||
Comparison of simulations
Join Date: Mar 2010
Location: South Korea
Posts: 249Rep Power: 8
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.
|July 21, 2010, 09:16||
Join Date: Jul 2009
Location: Ohio, USA
Posts: 169Rep Power: 8
|July 22, 2010, 01:43||
Join Date: Mar 2009
Posts: 3,061Rep Power: 31
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.
In memory of my friend Hervé: CFD engineer & freerider
|Thread||Thread Starter||Forum||Replies||Last Post|
|comparison with analytical results (1D)and(3D) CFX||Rogerio Fernandes Brito||FLUENT||1||December 2, 2012 07:12|
|Timestepping in two - phase Simulations using RSM||challenger85||CFX||0||January 4, 2010 06:00|
|thread pointer comparison crash in Fluent UDF||Miriam||Main CFD Forum||0||August 31, 2008 16:40|
|Comparison of tets and hexs||olaf||CFX||6||December 18, 2003 17:18|
|URANS and Transient Simulations||bob||Main CFD Forum||0||October 1, 2003 03:54|