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March 31, 2010, 12:54 |
droplet absorption diameter
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#1 |
Member
Join Date: Mar 2009
Posts: 38
Rep Power: 17 |
Hi,
I have a subdomain in which I want to remove particles from the domain. I know that I can use the "Absortion diameter". But now my question: The absorption diameter depends on the gas velocity, is it possible to implement this dependency? I tried to do something like absorption diameter = function of Velocity w, but the following error occurs: "Velocity w is not available for use in this term" Does anyone has an idea? Thanks in advance Claudia |
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March 31, 2010, 18:07 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,830
Rep Power: 144 |
The message is quite clear - you can't make absorption diameter a function of W velocity. Some variables can only be constants or functions of a subset of variables and I think you have found one. If you really need to do this talk to CFX support and they may be able to find a work around for you.
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April 1, 2010, 02:15 |
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#3 |
New Member
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try to create an expression in cfx pre like absorption diameter = f(velocity w), then use this expression in subdomain.
in expression you should use direct difinition, e.g. "massflowave(Velocity W)@inlet*1[s]" it means than your absorption diameter will be equal average velocity w in inlet BC |
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April 1, 2010, 07:30 |
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#4 |
Member
Join Date: Mar 2009
Posts: 38
Rep Power: 17 |
Thanks, Glenn for your answer. So I have to tell the support about it and I hope they will find a workaround.
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April 2, 2010, 06:14 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,830
Rep Power: 144 |
Yes, that's right. There will be a reason the absorption diameter cannot be set as a function of velocity. If you bypass the check, it may or may not affect your results - so talk to them and try to find out.
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Tags |
absorption, droplet, subdomain |
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