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-   -   bouyantBoussinesqPimpleFoam not working properly (http://www.cfd-online.com/Forums/openfoam-solving/110695-bouyantboussinesqpimplefoam-not-working-properly.html)

jki December 18, 2012 10:07

bouyantBoussinesqPimpleFoam not working properly
 
Hello
I am making a simulated flow over a heat transfer cylinder.
I am using bouyantBoussinesqPimpleFoam but is not working properly.
After a certain time the number of Courant becomes very high and the simulation does not converge.
I've used the same geometry without heat transfer with pisoFoam and everything went well.

What am I doing wrong.

thank's

adambarfi December 18, 2012 10:44

Quote:

Originally Posted by jki (Post 398079)
Hello
I am making a simulated flow over a heat transfer cylinder.
I am using bouyantBoussinesqPimpleFoam but is not working properly.
After a certain time the number of Courant becomes very high and the simulation does not converge.
I've used the same geometry without heat transfer with pisoFoam and everything went well.

What am I doing wrong.

thank's

dear Joaquim,
Welcome to Forum.

It may be caused by a lot of things, e.g.
- does it happen at the beging of your simulation? If yes your initial timestep might be too big...
- what Courant number do you set in controlDict?
- boundary conditions...

look at your log and see when the Courant number starts to rise. if you share your log, perhaps we can help you better.

jki December 19, 2012 05:21

1 Attachment(s)
Thanks for the reply

I am using the same geometry for pisoFoam and the bouyantBoussinesqPimpleFoam.
All the surfaces placed at the same temperature, to see if the problem was to those files.

Initially the number of Courant's stable and then suddenly at 2 second begins to skyrocket and the problem not converge.


thank you


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