Transient Pressure Conditions

hella1990 · April 29, 2012, 22:48

Hello,

I'm modeling transient inlet pressure conditions on FLUENT for the first time. The function is rather easy:

P=10+2t ; where t=time (s)

But I need P to max out at 50Pa. I've read I can do this using User-Defined Functions on C language. Is this necessary?

If it is, I should just write the code and make sure to include #include "udf.h"
and UDF_PROFILE (inlet_pressure, passed-in variables)?
and how would I know what the correct names of the passed-in variables? Also, once the file is written, all i have to do is compile it using the DEFINE window when I start the calculation set-up?

Please advise me if I am wrong about anything. Thank you in advance for your help.

xrs333 · April 30, 2012, 20:58

It's more straightforward to use transient profile:
(
(pressure transient 3 0)
(time 0 20 21)
(pressure 10 50 50)
)

April 29, 2012, 22:48	Transient Pressure Conditions	#1
hella1990 New Member Mohammed Join Date: Apr 2012 Posts: 2 Rep Power: 0	Hello, I'm modeling transient inlet pressure conditions on FLUENT for the first time. The function is rather easy: P=10+2t ; where t=time (s) But I need P to max out at 50Pa. I've read I can do this using User-Defined Functions on C language. Is this necessary? If it is, I should just write the code and make sure to include #include "udf.h" and UDF_PROFILE (inlet_pressure, passed-in variables)? and how would I know what the correct names of the passed-in variables? Also, once the file is written, all i have to do is compile it using the DEFINE window when I start the calculation set-up? Please advise me if I am wrong about anything. Thank you in advance for your help.

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April 30, 2012, 20:58		#2
xrs333 Senior Member xrs333 Join Date: Aug 2010 Posts: 125 Rep Power: 18	It's more straightforward to use transient profile: ( (pressure transient 3 0) (time 0 20 21) (pressure 10 50 50) )