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-   -   help:pumping gas into a closed domain (http://www.cfd-online.com/Forums/fluent/40500-help-pumping-gas-into-closed-domain.html)

frank April 9, 2006 10:44

help:pumping gas into a closed domain
 
Hi,

How to perform a simulation of pumping of a gas into a closed domain with Fluent? You are very kind of giving some guides about the subject mensioned above. Better, there is a closed domain with a velocity inlet but any outlet. How to make it with Fluent. I have tried, but the results showed no variance of density and pressure in the interior of the domain.How so?

Thanks in advance.

Best regards.

Ahmed April 9, 2006 12:22

Re: help:pumping gas into a closed domain
 
This is a classical tank pressurising problem. Your inlet BC has to be pressure inlet bc. Good Luck and be patient, it takes a lot of computing time

frank April 9, 2006 23:23

Mr. Ahmed: about pumping gas
 
Dear Mr. Ahmed,

Thank for your advice.

I want to know how to control the mass of pumping gas, if setting inlet BC into pressure-inlet BC?

Can you give me some detailed describtion or a simple case file with your kindness?

Best regards!

Frank

Ahmed April 10, 2006 08:12

Re: Mr. Ahmed: about pumping gas
 
Spend time studying the physics of your problem

The pressure inside the tank is changing with time,

You have to solve unsteady problem.

If you want to control the inlet mass flow you have to change the inlet pressure accordingly (the speed at the inlet is dependent on the pressure difference at the inlet) Start using a very small time step (1*10-6 s for example) and keep increasing the time step till you reach your objectives from the analysis. Good luck

Frank April 11, 2006 09:27

Mr. Ahmed: about pumping gas
 
Dear Mr. Ahmed,

Thanks a lot for your patience for asking my question! I got an problem: when I use a 2-Eulerian model , I find I can't use the ideal gas model for phase gas any more. I have to select the ideal gas model for phase gas which condition for comprssible problems described in Fluet Help document. But I have to use a 2-Eulerian model for my problem which contains a gas phase and a solid granula phase at same time(the fraction of granula phase is large not suitable for selecting the Mixture model). What shall I do?

Thanks again!


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