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-   -   help fluent: solidification/melting (http://www.cfd-online.com/Forums/fluent/38186-help-fluent-solidification-melting.html)

N_USMA October 11, 2005 05:34

help fluent: solidification/melting
 
Hi, I work with solidification melting model, and I have the following problem: when I use the value of thermal conductivity egal to 200, the solution converge. But when I change the termal conductivity to 20, the solution diverge, Why? I tested to change the under relaxiation factors, But always the solution diverges. Could you help me?


Vinod Dhiman October 11, 2005 07:41

Re: help fluent: solidification/melting
 
Hi

This increases the Prandtl number by a factor of 10. So, this may go out of range for the methods you might be using. Check for the schemes you are using, since usually with solidification (assuming you are using some metal) the Pr number ought to be small enough.

Vinod Dhiman

moh1367 February 3, 2010 13:56

Hello guys!

I'm trying to simulate an injection moulding process and I need to use solidification and VOF solver simutanteously. But every time I try to do so the Fluuent alert for a fatal error and say to close the program and reopen the case.Do you have this problem at all?

Thanks

kale March 10, 2010 14:00

Quote:

Originally Posted by N_USMA
;124968
Hi, I work with solidification melting model, and I have the following problem: when I use the value of thermal conductivity egal to 200, the solution converge. But when I change the termal conductivity to 20, the solution diverge, Why? I tested to change the under relaxiation factors, But always the solution diverges. Could you help me?

HI,
i have some problems with the solidification model.
actually i am confused with the procedure to be carried out for solving this model.
i am currently trying to solve a problem on "solidification in a rectangular enclosure."
i will be very thankful if u could give your e-mail id.

pushpak kale
pushpaq117@gmail.com

varunesh March 11, 2010 02:49

hi
I am currently solving a problem similar to Czochralski growth process(crystal growth) using FLUENT. Please tell me which type of boundary condition(wall,symmetry,.....) I must use for a free-surface type boundary.
thnx


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