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

chtMultiRegionFOAM derived fvPatchFields

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

LinkBack Thread Tools Display Modes
Old   April 21, 2012, 15:44
Default chtMultiRegionFOAM derived fvPatchFields
New Member
Gilles De Neyer
Join Date: Nov 2011
Posts: 18
Rep Power: 6
gdeneyer is on a distinguished road

I don't understand something about the solidWallMixedTemperatureCoupled boundary condition.

"// Both sides agree on
// - temperature : (myKDelta*fld + nbrKDelta*nbrFld)/(myKDelta+nbrKDelta)
// - gradient : (temperature-fld)*delta
// We've got a degree of freedom in how to implement this in a mixed bc.
// (what gradient, what fixedValue and mixing coefficient)
// Two reasonable choices:
// 1. specify above temperature on one side (preferentially the high side)
// and above gradient on the other. So this will switch between pure
// fixedvalue and pure fixedgradient
// 2. specify gradient and temperature such that the equations are the
// same on both sides. This leads to the choice of
// - refGradient = zero gradient
// - refValue = neighbour value
// - mixFraction = nbrKDelta / (nbrKDelta + myKDelta())

I don't understand the second choice (which is implemented). Why fixing theses values for refGradient, refValue and mixFraction leads to the similitude of the equations on both sides ?


gdeneyer is offline   Reply With Quote


Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Error in chtMultiRegionFoam kirankarki OpenFOAM 5 October 24, 2012 17:20
Embed explicitSetValue in chtMultiRegionFoam samiam1000 OpenFOAM 2 April 18, 2012 05:14
chtmultiregionFoam alvora OpenFOAM 9 February 23, 2011 04:06
Creating 100 derived parts / Splitting derived parts for mass flux calculation xamo STAR-CCM+ 8 September 29, 2009 05:35
Derived velocities from loss coefficients ?? jakjak CFX 1 December 20, 2007 15:38

All times are GMT -4. The time now is 21:01.