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Grid independence test for mixed convection problem

Posted by shikhabhuyanshikhabhuyan  
Grid independence test for mixed convection problem
May 21, 2017 05:20AM
Hi Friends,

I am trying to simulate mixed convection problem using Lattice Boltzmann method, and trying to make it grid independent.
I have assigned the values in the following way:
grid size: nx=200, ny=200
Prandtl number=0.71
tauf=(3*visco+0.5).........for momentum distribution function
taug=(3*alpha+0.5)........for thermal distribution function
Now, this top lid velocity(u_top) is used in the iterations to calculate the macroscopic variables. Since, u_top is depending on grid size, so every time this input parameter gets changed with changing grid size.Hence, I am facing problem with this grid independence test. It would be a great help if anyone can suggest me any solution.

Re: Grid independence test for mixed convection problem
June 08, 2017 07:33AM
if you use the incompflowparam class in palabos, you should check how it calculates the parameters. In LB parameters are related to each other so you cannot set all the parameter independently. To be sure as output parameters, you can print all initial parameter you set and see if the palabos change any of them?


Edited 2 time(s). Last edit at 06/08/2017 07:35AM by m.khatoonabadi.
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