CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

CFX does not solve heat transfer at fluid-solid interfaces

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   April 5, 2015, 16:04
Default CFX does not solve heat transfer at fluid-solid interfaces
New Member
Minas Gerais
Join Date: Apr 2015
Posts: 2
Rep Power: 0
Ivan Corgozinho is on a distinguished road
Hi everyone,

I’m simulating natural convection of air between two parallel solid plates. The plates are tilted of 45° with the horizontal. The dimensions of the plates are about 1 m per 1.5 m and the air gap is about 1.5 cm. All domains are specified as thermal energy model and I set the interfaces between the solids and the fluid as “conservative interface heat flux”. The variables all converge in the final solution, then I have the following problem: The fluid dynamics seems to be good but the heat transfer is unreal. The wall convective heat transfer is much smaller than the expected value, near to zero, as the wall convective heat transfer also is near to zero. The heat transfer that I obtained is almost totally equal to the Wall Radiative Heat Flux. The strange fact is that, trying to make a diagnostic, I deleted the solid domains of the two flat plates and simulated only the air between them, keeping all configurations except the interfaces that I substituted for boundary conditions of fixed temperature, equal to the average temperature that I firstly obtained in each interface with the parallel plates. When I make this test the heat transfer calculations seemed to be very near to the expected, with Wall Convective Heat Transfer about 100 times higher than the value obtained when I simulated all the geometries.
Does anyone have an idea of what may be happening and what would be the solution to this problem? The size of the mesh in both sides of the interfaces are the same order of magnitude.

Thanks in advance!
Ivan Corgozinho is offline   Reply With Quote

Old   April 6, 2015, 20:28
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,564
Rep Power: 141
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Have you checked your imbalances? Your simulation may not have converged adequately. This is a common problem with CHT simulations.
ghorrocks is offline   Reply With Quote

Old   April 7, 2015, 01:08
Senior Member
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,155
Rep Power: 22
evcelica is on a distinguished road
Sounds to me like you didn't check the box "heat transfer" in the interface specification on the tree.
evcelica is offline   Reply With Quote


cht coupling, fluid-solid coupling, heat transfer coefficeint, natural convectin

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Heat Transfer Solid to Fluid [CFX] skaboy607 CFX 15 January 11, 2021 20:19
Help needed in meshing for Solid to Fluid Heat Transfer niazaliahmed FLUENT 2 February 22, 2020 16:47
increasing mesh quality is leading to poor convergence tippo CFX 2 May 5, 2009 11:55
How can I increase Heat Transfer at Domain Interf? B.Simon CFX 3 October 28, 2008 19:53
urgent: heat transfer fluid to solid marco FLUENT 1 October 28, 2005 23:17

All times are GMT -4. The time now is 13:38.