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Old   August 17, 2008, 22:51
Default Instantaneous pressure and temperature
George Thomas
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Hi, I'm trying to model IC engine combustion in CFX. I'm trying to specify a variable Heat Transfer Coefficient, and for that I need to get instantaneous pressure and temperature in the model to use in the expression for evaluating HTC. Is there any means by which I can use the instantaneous pressure and temperature at any point in the model during the simulation, to use in the expression for evaluating HTC. Thank You.


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Old   August 20, 2008, 04:47
Default Re: Instantaneous pressure and temperature
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You can introduce a user expression which can be a function of any variable.


h = 10000[W/(m^2*K)] + 100[W/(m^2*K^2)]*T + 10[W/(m^2*K*Pa)]*p

where T and p are the standard names for temperature and pressure used by CFX. Then you define your define your heat transfer coefficient to be h at the wall.

- Terje
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