Temperature gradient macros

ameyadurve · October 3, 2009, 06:14

I am studying the mixing of two non-siothermal jets. The maximum temperature difference between the jets is 5 K (cold jet at 298 K and hot jet at 303 K)

However, when I extract the data of temperature gradients I get following values:

Gradients

C_T_G(c, t)[0] = -511.587 (min value) and 666.1385 (max value)
C_T_G(c, t)[1] = -118.3925 (min value) and 165.9301 (max value)

Reconstruction Gradients

C_T_RG(c, t)[0] = -311.3554 (min value) and 374.1836 (max value)
C_T_RG(c, t)[1] = -114.3944 (min value) and 160.957 (max value)

Can anyone please explain why fluent is showing such high values of gradients when the max temperature difference is only 5 K and the system does not involve any sources for generation of heat

P.S: I have extracted the values of these gradients by assingning an UDMI to each one of them.

ak6g08 · October 9, 2009, 14:16

do you mind posting your UDF? and information about your geometry.

October 3, 2009, 06:14	Temperature gradient macros	#1
ameyadurve New Member Ameya Durve Join Date: Jun 2009 Location: Mumbai Posts: 10 Rep Power: 17	I am studying the mixing of two non-siothermal jets. The maximum temperature difference between the jets is 5 K (cold jet at 298 K and hot jet at 303 K) However, when I extract the data of temperature gradients I get following values: Gradients C_T_G(c, t)[0] = -511.587 (min value) and 666.1385 (max value) C_T_G(c, t)[1] = -118.3925 (min value) and 165.9301 (max value) Reconstruction Gradients C_T_RG(c, t)[0] = -311.3554 (min value) and 374.1836 (max value) C_T_RG(c, t)[1] = -114.3944 (min value) and 160.957 (max value) Can anyone please explain why fluent is showing such high values of gradients when the max temperature difference is only 5 K and the system does not involve any sources for generation of heat P.S: I have extracted the values of these gradients by assingning an UDMI to each one of them. Last edited by ameyadurve; October 3, 2009 at 09:45.

October 9, 2009, 14:16		#2
ak6g08 Member Akour Join Date: May 2009 Posts: 79 Rep Power: 17	do you mind posting your UDF? and information about your geometry. __________________ akour

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Temperature Gradient at Wall	sven	OpenFOAM	7	November 1, 2010 18:25
temperature normal gradient on a boundary	Sandrine	Main CFD Forum	2	June 10, 2009 17:34
Temperature gradient	Jaho	CFX	2	March 12, 2009 20:36
Question on Face Temperature Gradient	Tomasz Didenko	FLUENT	1	June 27, 2003 05:30
Direct calculation of temperature gradient	J.W.Ryu	FLUENT	5	December 27, 2001 07:39