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-   -   set the pressure on a whole subdomain (http://www.cfd-online.com/Forums/cfx/22569-set-pressure-whole-subdomain.html)

nicolas May 18, 2006 03:00

set the pressure on a whole subdomain
 
Hi. It's the first time I am working on CFX. I am using CFX 5.7.1 I want to set the value of the pressure and the temperature on a whole subdomain. These value are in .csv file How can I make to do that? The main problem for me, is: how to set the pressure and the temperature on a subdomain?

Thanks, Nicolas


Mike May 18, 2006 08:54

Re: set the pressure on a whole subdomain
 
You can add a source term and source coefficient to the energy equation in the subdomain to maintain a fixed temperature. For example, use the follow expressions:

LIBRARY: CEL:

EXPRESSIONS:

Scoeff = -1000000 [W m^-3 K^-1]

Sterm = Scoeff * (T - 325 [K])

END END END

Scoeff is just any big number; the bigger it gets, the stronger the correction source will become.

Pressure is part of the solution and there is no such thing as a pressure source term, so you cannot control pressure in a similar way. Mike



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