Transient oscillatory flow
I am trying now to solve a simplified thermoacoustic problem using Fluent6.1. It is simply an oscillatory flow problem inside a channel, with transient pressure boundry conditons
time:0-->15.71s (period of one cycle is 1.571 s).
I am using the segregated solver with 2nd order implicit unsteady formulation. I got converged solution, with the same trend as the analytical solution but with some differences. If i used a time step of 0.01 s, i noticed that fluent will give me a very good agreement with analytical solution but for a time 0.03 sec earlier than that of the analytical solution. that is analyt sol at t=14.3 is the same as that of fluent but at t=14.27 .
I solved the same problem with Comsol Multiphysics (Femlab 3.2) and it gave me the same results as analyt sol with no time lag.
I also noticed that coupled solver doesnt work for this problem ( iam using viscous incompressible fluid) ??!!
Any suggestions, to solve the problem??!!
Your help is so much appreciated.
Best regards, YMS
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