Piston Heat Transfer

JPD08 · August 16, 2017, 08:25

Hi there,

I am am trying to replicate heat transfer to a piston from a fluid model acting as a heating source. I have a co-simulation set up between a solid piston model and a fluid model,where the piston crown is the coupling surface. I want to set the solid piston models physics continua initial conditions to an import mapped temperature. When using the mapped temperature as an initial condition, the piston temperature reduces, regardless of what the fluid model is doing.

However, if I instead set the piston initial conditions to a constant static value, the model works and the fluid heats the piston. Therefore, the issue seems to be with using a mapped temperature as an initial condition field function.

Does anyone have any ideas or advice for me? I must add that I am not experienced with Star CCM+ so any help will be greatly appreciated.

Thanks.

ping · August 19, 2017, 05:15

this is not logical and can only be caused by different boundary conditions between the two cases during solving that is assuming that the temperatures are not so extremely different between the two cases

have you checked what the mapped initial temperatures look like before solving by initializing then doing some section scenes of this field?

August 16, 2017, 08:25	Piston Heat Transfer	#1
JPD08 New Member James Deanus Join Date: Aug 2017 Posts: 1 Rep Power: 0	Hi there, I am am trying to replicate heat transfer to a piston from a fluid model acting as a heating source. I have a co-simulation set up between a solid piston model and a fluid model,where the piston crown is the coupling surface. I want to set the solid piston models physics continua initial conditions to an import mapped temperature. When using the mapped temperature as an initial condition, the piston temperature reduces, regardless of what the fluid model is doing. However, if I instead set the piston initial conditions to a constant static value, the model works and the fluid heats the piston. Therefore, the issue seems to be with using a mapped temperature as an initial condition field function. Does anyone have any ideas or advice for me? I must add that I am not experienced with Star CCM+ so any help will be greatly appreciated. Thanks.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
UDF for mass and heat source with heat transfer	rajendra1	Fluent UDF and Scheme Programming	35	October 13, 2017 05:04
Interphase mass transfer of a reaction	cfx_ws1992	Main CFD Forum	0	May 15, 2017 22:42
Error finding variable "THERMX"	sunilpatil	CFX	8	April 26, 2013 08:00
Question about heat transfer simulation	Anna Tian	Main CFD Forum	0	January 25, 2013 19:53
Convective Heat Transfer - Heat Exchanger	Mark	CFX	6	November 15, 2004 16:55

August 19, 2017, 05:15		#2
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	this is not logical and can only be caused by different boundary conditions between the two cases during solving that is assuming that the temperatures are not so extremely different between the two cases have you checked what the mapped initial temperatures look like before solving by initializing then doing some section scenes of this field?