Forced heat transfer model

srinivasa · September 14, 2011, 06:38

Hello...
I am modelling a forced heat transfer model in Mcc(Motor Control Centre) which is in rectangular shape in fluent. It has inlet at bootom at the top there are fans of 700 cfm. in rectangular box there are bus bars which are generating heat flux. i meshed this model in gambit with nearly 8 lakh elements. Firstly i am starting with momentum and continuity eqn . when i am strating with energy eqn the contuinuity and momentum residuals are suddenly rising there after they are not decreasing... Can any one please suggest me out is to be modeled

mettler · September 14, 2011, 08:55

I have found that the residuals will rise when your mesh is not done well. Work on the mesh.

srinivasa · September 15, 2011, 01:24

Thanks .. but i have done very good mesh.. the rectangular box of size 90*30 inches contain nearly 14 lakh elements.. and gambit showing there are no skewness in it ..

September 14, 2011, 06:38	Forced heat transfer model	#1
srinivasa New Member sree Join Date: Jun 2011 Posts: 12 Rep Power: 16	Hello... I am modelling a forced heat transfer model in Mcc(Motor Control Centre) which is in rectangular shape in fluent. It has inlet at bootom at the top there are fans of 700 cfm. in rectangular box there are bus bars which are generating heat flux. i meshed this model in gambit with nearly 8 lakh elements. Firstly i am starting with momentum and continuity eqn . when i am strating with energy eqn the contuinuity and momentum residuals are suddenly rising there after they are not decreasing... Can any one please suggest me out is to be modeled

September 15, 2011, 01:24	Forced convection heat transfer	#3
srinivasa New Member sree Join Date: Jun 2011 Posts: 12 Rep Power: 16	Thanks .. but i have done very good mesh.. the rectangular box of size 90*30 inches contain nearly 14 lakh elements.. and gambit showing there are no skewness in it ..

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September 14, 2011, 08:55		#2
mettler Senior Member Andrew Join Date: Mar 2009 Location: Washington, DC Posts: 211 Rep Power: 19	I have found that the residuals will rise when your mesh is not done well. Work on the mesh.