# Expert-param:: Cht diffusion scheme

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

 July 12, 2010, 09:16 Expert-param:: Cht diffusion scheme #1 New Member   Join Date: May 2009 Posts: 24 Rep Power: 9 Hi, can anybody tell me what the expert parameter cht diffusion scheme does mean? In which cases does it make sense to set it to its none default-values (=1-4 and 6)? cht diffusion scheme: Specifies the diffusion scheme for CHT solids: 1=central (interior) , central (boundary); 2=posdef coefficients (interior), central (boundary); 3=posdef values (interior) , posdef values (boundary); 4=blended scheme (interior) , central (boundary); 5=posdef coefficients (interior), posdef values (boundary); 6=blended scheme (interior) , posdef values (boundary)

 July 12, 2010, 10:14 #2 Senior Member   Join Date: Apr 2009 Posts: 531 Rep Power: 13 I can't think of any situation where you'd want to change this. What's the motivation for looking at this?

 July 12, 2010, 10:23 #3 New Member   Join Date: May 2009 Posts: 24 Rep Power: 9 It would be nice if you let me participate your knowledge about this expert paramerer.

 July 12, 2010, 13:20 #4 Senior Member   Join Date: Apr 2009 Posts: 531 Rep Power: 13 The parameter controls the numerical scheme used to solve the heat diffusion equation in a solid. There's different treatment for boundary nodes and interior nodes. posdef = Positive Definite; you can google this to get more details for the definition of Positive Definite. I assume central means central differencing, but don't know for sure. blended scheme would be a blending, presumably between the central and posdef schemes. "values" refers to the right-hand side of the matrix solution; i.e. if you have [A][x]=[b], then [b] are your "values". "coefficients" refers to [A].

 July 12, 2010, 13:49 #5 New Member   Join Date: May 2009 Posts: 24 Rep Power: 9 Hi, thanks for the information.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20 John S. CFX 2 September 9, 2008 21:54 charles CFX 4 November 3, 2006 15:15 James CFX 5 April 19, 2006 18:40 Z.Zeng Main CFD Forum 8 October 22, 1999 09:06

All times are GMT -4. The time now is 06:42.