# variable porous resistance

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 August 18, 2011, 19:27 variable porous resistance #1 Member   sajad Join Date: Nov 2010 Posts: 51 Rep Power: 9 hi to all is it possible to change porous resistance by time? i use a "CEL expression" in form of "if(t<0.08[s],20000[m^-1],100000[m^-2] *t)" but it gives me that the dimenssins are inconsistent.... what is the problem? best regards

 August 19, 2011, 00:47 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,196 Rep Power: 109 The units of your expression are inconsistent. Before 0.08s it evaluates to 20000[m^-1], and after it evaluates to 100000[s m^2]. You need to fix your expression up and it should work fine.

 August 19, 2011, 05:04 #3 Member   sajad Join Date: Nov 2010 Posts: 51 Rep Power: 9 hi. your right it works.thanks i have another quastion.i define an "AV" by name of "cvr" then i give value of "20000[m^-1]" then i set the resistance of porous domain by expression and equal to "cvr",i iterate it it gives me q1 which is flowrate.then i set the value of "cvr" equal to "cvr" instead of "20000".actually they are equal. but when i run it fives me another q2. im really confused

 August 22, 2011, 21:36 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,196 Rep Power: 109 I do not understand your question. Please post the CCL of your case as an attachment.

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