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.

Re: displacement Ventilation
 

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

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.

Re: displacement Ventilation
 

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

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