[lorenrpg]

Hi everybody,
I would like two know how to mix two different gases, each one with its own inlet, into a valve in a complete mixing. I was told to try with multiphase module but so far i couldn't find a way to resolve this problem.

Thanks in advance.

[cfdvenkatesh]

Originally Posted by lorenrpg

Hi everybody,
I would like two know how to mix two different gases, each one with its own inlet, into a valve in a complete mixing. I was told to try with multiphase module but so far i couldn't find a way to resolve this problem.

Thanks in advance.

You could use Species Transport model to simulate mixing of 2 different gases. If your application is not IC engine related, I would suggest to use General Species Transport.
In the inlets you can specify the mass fractions for the gases you like.

[lorenrpg]

Thank you so much, but still now i'm not able to to get proper results. I am using the general method to indtroduce the composition of syngas (O2,H2,CH4,CO,CO2,N2) like species and the i set the molar fraction in boundary conditions but it always diverge. I tried changing underrelaxion factor or equations but it is useless.
Thanks.

[zpetrano]

Check mesh, then relax a little your time discretisation.
It diverges in which equation? It diverges suddenly or in some time? You can alway put your *.fla file or at least par of it...

BR
Z