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George Thomas August 17, 2008 22:51

Instantaneous pressure and temperature
 
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.

George


Terje August 20, 2008 04:47

Re: Instantaneous pressure and temperature
 
Hi,

You can introduce a user expression which can be a function of any variable.

e.g

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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