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siara817 March 7, 2012 06:23

Diverging Eulerian Multiphase
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I am simulating particles in the air.
The geometry is a room and a candle inside.
When I try steady state, it shows from the beginning floating point.
When I use Unsteady with low relaxation factors, it works to some extent, but whenever I change it to steady state, again it starts to diverge.
Any advice is highly appreciated.

abdul099 March 7, 2012 18:51

Looks like an Eulerian multiphase simulation, right?
In that case, run it laminar, it's very unstable when running it turbulent.
Another try is to reduce under-relaxation factors to very very very low numbers.
Or even better: Try both at the same time!

I understand that's not satisfying, but unfortunately the Eulerian approach is very unstable under turbulent conditions. There are too much equations affecting each other.

siara817 March 8, 2012 02:59

Thanks abdul099, it is so nice of you :)

Kanarya January 2, 2014 13:12

Did you get the solution with steady state?
I have the same problem.
can you help me!
thanks in advance

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