Steady State Covergence issue - FloEFD

PARK YOONSUN · October 6, 2016, 03:53

Hello Experts~

A electronics closed system and examined using a FloEFD(V15.2).

GG Heat Transfer Rate + GG Net Radiation Rate is greater than input total power by approximately 10% after Solving in the Steady State.
So a higher temperature compared to the results Flotherm.(I deal with all products)

In general, the equilibrium temperature is thought input data = emitted power, → Steady State

In order to solve this problem, please check the other way adjustment.

Thank you~

Please note the following information to the model.
Fluid Cells : 367120
Solid Cells : 396262
Iteration per 1 Travel : 154
Convergence Iteration : 154
calculation Time : 55min

Boris_M · October 11, 2016, 06:01

Hi,

It is better to check the heat generation rate and net radiation rate on the components than directly using them globally. You can see the difference easily from each component.
It is really hard to tell what might be wrong based on the information you provided about the model.

If you cannot find the error, then it is best to send the model to the support and let them have a look at it and help you.

Regards,
Boris

October 6, 2016, 03:53	Steady State Covergence issue - FloEFD	#1
PARK YOONSUN New Member PARK YOONSUN Join Date: Oct 2016 Posts: 1 Rep Power: 0	Hello Experts~ A electronics closed system and examined using a FloEFD(V15.2). GG Heat Transfer Rate + GG Net Radiation Rate is greater than input total power by approximately 10% after Solving in the Steady State. So a higher temperature compared to the results Flotherm.(I deal with all products) In general, the equilibrium temperature is thought input data = emitted power, → Steady State In order to solve this problem, please check the other way adjustment. Thank you~ Please note the following information to the model. Fluid Cells : 367120 Solid Cells : 396262 Iteration per 1 Travel : 154 Convergence Iteration : 154 calculation Time : 55min

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Different Pressure in steady state and tranisente simulation	abcdefgh	CFX	4	January 29, 2015 16:47
Time step dependence of convergence behavior of steady state simulations in CFX	Chander	Main CFD Forum	5	December 23, 2013 05:31
Constant velocity of the material	Sas	CFX	15	July 13, 2010 08:56
steady state, laminar vof_model	Garima Chaudhary	FLUENT	0	May 24, 2007 03:11
About the difference between steady and unsteady problems	Lisa	Main CFD Forum	11	July 5, 2000 14:37

October 11, 2016, 06:01		#2
Boris_M Disabled Join Date: Jul 2009 Posts: 616 Rep Power: 23	Hi, It is better to check the heat generation rate and net radiation rate on the components than directly using them globally. You can see the difference easily from each component. It is really hard to tell what might be wrong based on the information you provided about the model. If you cannot find the error, then it is best to send the model to the support and let them have a look at it and help you. Regards, Boris