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-   -   Transient Problem (http://www.cfd-online.com/Forums/fluent/29725-transient-problem.html)

Sundar May 6, 2002 11:52

Transient Problem
 
Hi People, I am trying to solve a Transient Problem in Fluent Version 6 and I am having convergence problems. I was able to obtain convergence in Steady state model. Well the problem is to see whether flow reaches at the same time in eight reactors mounted in series. Flow comes from an inlet duct and branches before it reaches the inlet of the reactors. The design is done so as to reach the reactor inlets at the same time. well the time it takes for flow to reach the inlets of the reactors is 0.13 seconds. The flow is turbulent and I am taking advantage of enhanced wall functions in vesrion 6. The turbulent model I am applying right now is the realizable K-e Model. Well any suggestions how to be successfull in transient problems will be greatly appreciated.

Thanks Sundar

Rajeev Kumar Singh May 7, 2002 07:34

Re: Transient Problem
 
Have you validated the results you get from Fluent 6.0. When I ran species transport model on the case file which i had previously solved with fluent 5.5, i got completely different (impossible results with fluent 6.0).

So I have some doubts regarding fluent 6.0. If you are having convergence difficulties then try by reducing the time step size. I hope this might ease your problem

Rajeev


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