can i get pressure derivative in UDF?

ruirui389 · April 8, 2011, 03:10

hi. now i need to get the pressure derivative $\partial p/\partial x$ in UDF. is there any macros i could use like the velocity derivative macros(C_DUDX(c,t))? if not, how can i get the pressure derivative?
Thank you for replying.

coglione · April 8, 2011, 03:46

C_P_G(c,t) will give you the pressure gradient vector. dp/dx = C_P_G(c,t)[0]

cheers

ruirui389 · April 8, 2011, 03:54

thank you so much for replying. so you mean the pressure gradient equals pressure derivative here?

coglione · April 8, 2011, 04:10

yes it is
cheers

ruirui389 · April 8, 2011, 04:12

ok, thank u and cheers!!! lol

April 8, 2011, 03:10	can i get pressure derivative in UDF?	#1
ruirui389 New Member Join Date: Mar 2011 Posts: 6 Rep Power: 15	hi. now i need to get the pressure derivative $\partial p/\partial x$ in UDF. is there any macros i could use like the velocity derivative macros(C_DUDX(c,t))? if not, how can i get the pressure derivative? Thank you for replying.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
UDF to adjust pressure outlet	a.lynchy	FLUENT	4	February 15, 2021 00:50
Calculation of the Governing Equations	Mihail	CFX	7	September 7, 2014 06:27
Pressure BC for combustion chamber	Giuki	FLUENT	1	July 19, 2011 11:35
calculation average pressure in a plane with UDF	Vitalij	FLUENT	1	April 10, 2007 03:39
Neumann pressure BC and velocity field	Antech	Main CFD Forum	0	April 25, 2006 02:15

April 8, 2011, 03:46		#2
coglione Senior Member Max Join Date: Mar 2009 Posts: 133 Rep Power: 17	C_P_G(c,t) will give you the pressure gradient vector. dp/dx = C_P_G(c,t)[0] cheers

April 8, 2011, 03:54		#3
ruirui389 New Member Join Date: Mar 2011 Posts: 6 Rep Power: 15	thank you so much for replying. so you mean the pressure gradient equals pressure derivative here?

April 8, 2011, 04:10		#4
coglione Senior Member Max Join Date: Mar 2009 Posts: 133 Rep Power: 17	yes it is cheers

April 8, 2011, 04:12		#5
ruirui389 New Member Join Date: Mar 2011 Posts: 6 Rep Power: 15	ok, thank u and cheers!!! lol