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August 18, 2011, 19:27 |
variable porous resistance
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#1 |
Member
sajad
Join Date: Nov 2010
Posts: 51
Rep Power: 15 |
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 |
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August 19, 2011, 00:47 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
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.
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August 19, 2011, 05:04 |
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#3 |
Member
sajad
Join Date: Nov 2010
Posts: 51
Rep Power: 15 |
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 |
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August 22, 2011, 21:36 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
I do not understand your question. Please post the CCL of your case as an attachment.
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