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-   -   displacement Ventilation (http://www.cfd-online.com/Forums/fluent/48673-displacement-ventilation.html)

Chin Lim July 4, 2008 00:21

displacement Ventilation
 
Dear all,

I am now trying to perform a displacement ventilation simulation. Below are my boundaries:

1. Pressure inlet 2. Pressure outlet 3. Heat source with 309K temperature.

The model i used is:

1. k-e, 2.RNG 3.Gravity on, full buoyancy 3.ideal gas density 4.PISO pressure-velocity coupling 5. PRESTO pressure discretization

Here are my setting. Does it have any mistake?

Thanks for any advise.

red lemon July 4, 2008 02:51

Re: displacement Ventilation
 
could also try body force weighted for pressure but looks ok. You may find stnd ke more robust than RNG.

Chin Lim July 4, 2008 03:24

Re: displacement Ventilation
 
Thank you red lemon.

I try stnd ke. and can't converge. but with rng, it converge at 100+ ite.

Thanks again. I will try BFW also for my discovery.

red lemon July 4, 2008 03:35

Re: displacement Ventilation
 
Thats interesting as stnd is one of the most robust models. Do you have highly strained/shearing flows?

Chin Lim July 4, 2008 04:39

Re: displacement Ventilation
 
I don't think so. So how should i deal with the setting if i am using a stnd? I tried before with stnd for 2000 ite, the result never converged.

Thanks a lot for your help

Cheers, Chin Lim


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