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Can I use COMSOL to solve this?
Posted 2012年2月16日 GMT-5 14:03 4 Replies
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I got a set of coupled PDEs where one of them reads:
dv/dt + v*dv/dx +dp/dx = 0
It is hard to see how the "Coefficient Form PDE" can inplement the "v*dv/dx +dp/dx" part. Any suggestions?
dv/dt + v*dv/dx +dp/dx = 0
It is hard to see how the "Coefficient Form PDE" can inplement the "v*dv/dx +dp/dx" part. Any suggestions?
4 Replies Last Post 2012年2月17日 GMT-5 09:23
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Posted:
1 decade ago
Why don't you use the general form ?
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Posted:
1 decade ago
have you tried to put dp/dx as the source term 'f' in the coefficient form? Correct me if I'm wrong: source term can be anything, the Comsol solver will deal with it.
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Posted:
1 decade ago
Hi Murali, I can't see how that would change things... the general form should just be the compact version of the Coefficient Form PDE.
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Posted:
1 decade ago
Ah, I think I get what you are saying is that I should rewrite things like:
dv/dt + v*dv/dx +dp/dx = 0 ==>
1/v * dv/dt + dv/dx = -1/v * dp/dx ==>
1/v * dv/dt + dv/dx = -K/v , where: dp/dx = K
So I just add another equation! Well I think this trick should work.
Thanks Francois.
dv/dt + v*dv/dx +dp/dx = 0 ==>
1/v * dv/dt + dv/dx = -1/v * dp/dx ==>
1/v * dv/dt + dv/dx = -K/v , where: dp/dx = K
So I just add another equation! Well I think this trick should work.
Thanks Francois.