faster convergence of temperatures

keeper · March 30, 2016, 11:03

Dear all,

I run steady state simulation with CHT. Convergence of fluid domains is reached quite fast (200 iterations). But then I need to wait another 500 iterations for convergence of solid domains.

How to reach them faster? Does time scale factor for solids help? Or is there any other way? if so, does it affect RMS?

Thank you in advance.

Best regards

Opaque · March 30, 2016, 11:07

It is common practice to use a solid timescale 1000 times (or more) larger than the fluid timescale for CHT problems.

keeper · March 30, 2016, 11:12

Thank you Opaque for quick answer. Do you have experience if it changes RMS velues?

Opaque · March 30, 2016, 11:43

RMS values should not be a function of the physical timescale.

March 30, 2016, 11:03	faster convergence of temperatures	#1
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 16	Dear all, I run steady state simulation with CHT. Convergence of fluid domains is reached quite fast (200 iterations). But then I need to wait another 500 iterations for convergence of solid domains. How to reach them faster? Does time scale factor for solids help? Or is there any other way? if so, does it affect RMS? Thank you in advance. Best regards

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March 30, 2016, 11:07		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,869 Rep Power: 33	It is common practice to use a solid timescale 1000 times (or more) larger than the fluid timescale for CHT problems.

March 30, 2016, 11:12		#3
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 16	Thank you Opaque for quick answer. Do you have experience if it changes RMS velues?

March 30, 2016, 11:43		#4
Opaque Senior Member Join Date: Jun 2009 Posts: 1,869 Rep Power: 33	RMS values should not be a function of the physical timescale.