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Average velocity value in Comsol

Posted Jun 5, 2012, 6:20 a.m. EDT 4 Replies

Fatma Alamur
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Hi everybody,

I need the average velocity field value for a chosen line, not in boundaries.
Is it possible in Comsol (3.5)?
Many thanks
4 Replies Last Post Jun 24, 2012, 2:14 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Jun 5, 2012, 7:06 a.m. EDT
Hi

use the definition of an average: integration of your argument over the boundary (area or line) and then divide by the integration of 1 over the same area or line

in v4 its aveop1(T) = intop1(T) / intop1(1)

with the default assumption in COMSOL of implicit *dx*dy*dz for the integrations (or just *dx*dy for surface etc)

--
Good luck
Ivar
Hi use the definition of an average: integration of your argument over the boundary (area or line) and then divide by the integration of 1 over the same area or line in v4 its aveop1(T) = intop1(T) / intop1(1) with the default assumption in COMSOL of implicit *dx*dy*dz for the integrations (or just *dx*dy for surface etc) -- Good luck Ivar
Fatma Alamur
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Posted: 1 decade ago Jun 5, 2012, 8:18 a.m. EDT
Hi Mr. Ivar,

Many thanks for your quick reply.
I will apply. Have a nice day
Hi Mr. Ivar, Many thanks for your quick reply. I will apply. Have a nice day
Fatma Alamur
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Posted: 1 decade ago Jun 23, 2012, 4:21 p.m. EDT
Hi again,
My study subject is design of micro orifice plate flow meter, and in these dimensions Re is too low. I used Mems Module, Microfluidics- Incompressible Navier Stokes and Steady State analysis. Is there any module that defines creeping flow? Or if I used this module, is it ok?
anticipate thanks
Hi again, My study subject is design of micro orifice plate flow meter, and in these dimensions Re is too low. I used Mems Module, Microfluidics- Incompressible Navier Stokes and Steady State analysis. Is there any module that defines creeping flow? Or if I used this module, is it ok? anticipate thanks
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Jun 24, 2012, 2:14 a.m. EDT
Hi

have you tried to index your pdf doc files of COMSOL and done a search?

I beleive there were a creep flow physics mode, but it might now have migrated into the new micro-flow module ;)
Really in 3.5 its getting to old for me to remember, I'm a luck user of a "rich" company following the maintenance flow. On the other side I find COMSOL reasonable, compared to many others FEM providers, but I should perhaps not say that here, they might want to change it ...

--
Good luck
Ivar
Hi have you tried to index your pdf doc files of COMSOL and done a search? I beleive there were a creep flow physics mode, but it might now have migrated into the new micro-flow module ;) Really in 3.5 its getting to old for me to remember, I'm a luck user of a "rich" company following the maintenance flow. On the other side I find COMSOL reasonable, compared to many others FEM providers, but I should perhaps not say that here, they might want to change it ... -- Good luck Ivar

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