Material properties variation

mattedi · August 25, 2012, 10:58

Please, In my analysis I tried to include a solid domain wich its properties :the heat conductivity and density are dependent of temperature and spacial position, therefore the CFX solver send an erro message where it informes that the material properties can't be dependent of temperature and position f(T,y) . Do you have any suggestion ?!!

thanks !!

ghorrocks · August 25, 2012, 21:01

The error message is clear - you cannot do this. The reason is this generates additional cross-terms which are not incorporated in the solver and therefore the accuracy cannot be guaranteed. You might be able to get around this by editting the RULES file you do this at your own risk - no guarantees of anything if you do that.

Felggv · August 29, 2012, 12:57

Hello, this topic should teach you how to modify your RULES file.

http://www.cfd-online.com/Forums/cfx...ple-solve.html

Check post #15.

The path to the file is: C:/Program Files/ANSYS Inc/v130/CFX/etc. There should be a file named RULES... you can edit it by opening as text.

Remember to backup the file before doing it!

Good luck.

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August 25, 2012, 10:58	Material properties variation	#1
mattedi New Member marco Join Date: Jul 2011 Location: Brasil Posts: 3 Rep Power: 14	Please, In my analysis I tried to include a solid domain wich its properties :the heat conductivity and density are dependent of temperature and spacial position, therefore the CFX solver send an erro message where it informes that the material properties can't be dependent of temperature and position f(T,y) . Do you have any suggestion ?!! thanks !!

August 25, 2012, 21:01		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,701 Rep Power: 143	The error message is clear - you cannot do this. The reason is this generates additional cross-terms which are not incorporated in the solver and therefore the accuracy cannot be guaranteed. You might be able to get around this by editting the RULES file you do this at your own risk - no guarantees of anything if you do that.

August 29, 2012, 12:57		#3
Felggv Member Felipe Gobbi Join Date: Apr 2012 Location: Brazil Posts: 76 Rep Power: 14	Hello, this topic should teach you how to modify your RULES file. http://www.cfd-online.com/Forums/cfx...ple-solve.html Check post #15. The path to the file is: C:/Program Files/ANSYS Inc/v130/CFX/etc. There should be a file named RULES... you can edit it by opening as text. Remember to backup the file before doing it! Good luck.