CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

How to combine convection and heat flux BC?

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

LinkBack Thread Tools Search this Thread Display Modes
Old   December 21, 2023, 10:06
Default How to combine convection and heat flux BC?
New Member
nicolas Claverie
Join Date: Sep 2022
Posts: 3
Rep Power: 3
dynalo is on a distinguished road

I want to simulate a solid sphere in open air receiving a constant heat flux.

Basically the BC of my sphere should be a combination of



type externalWallHeatFluxTemperature;
mode power;
Q uniform 5; // 5 W received on the boundary
kappaMethod solidThermo;
value uniform 300;

for the constant heat flux, and

type compressible::turbulentTemperatureRadCoupledMixed;
Tnbr T;
kappaMethod solidThermo;
value uniform 314;

For the convection.

Is there a way to do that?
One option would be to add a constant radiation flux on the sphere but I never used radiation in a model so I am not very confortable to do that.

PS: install information if relevant:
Windows 11 pro 22H2
Ubuntu 22.04.3 LTS
Openfoam 2306
dynalo is offline   Reply With Quote

Old   December 21, 2023, 13:00
Senior Member
Join Date: Apr 2020
Location: UK
Posts: 665
Rep Power: 14
Tobermory will become famous soon enough
You want to specify both the heat flux and the HTC, without any radiation present? Surely this is over-specifying the boundary condition?

And what do you mean by "convection" ... it can't be the usual meaning, i.e. convection to the fluid inside the domain, since you are already specifying the heat flux (which will in turn define the boundary surface temperature) ... and the only way the code could achieve this would be to set both the boundary temperature and the cell temperature, which is not allowed.

If you mean "conduction" through the wall, rather than "convection", i.e. set an external surface temperature and a heat transfer coeff thru the wall, then this is over-constrained & impossible to implement.

So I am a bit puzzled my friend as to what you are trying to achieve. It doesn't sound physical. Ofc, I may have misunderstood ...
Tobermory is offline   Reply With Quote


boundaries condition, convection, heat transfer, openfoam

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
Time alternating Convection and Heat flux BC jchan033 Fluent UDF and Scheme Programming 5 December 24, 2016 01:14
Heat flux with convection and radiation loss kcgmech Fluent UDF and Scheme Programming 0 February 11, 2016 04:08
convection + known heat flux BC in the same wall zfaraday OpenFOAM 0 November 19, 2013 16:01
Error finding variable "THERMX" sunilpatil CFX 8 April 26, 2013 07:00
Natural convection with heat flux Anton FLUENT 5 April 2, 2007 04:03

All times are GMT -4. The time now is 09:04.