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volume force field for laminar flow simulation

Posted 3 mag 2012, 10:10 GMT-4 Fluid & Heat, Microfluidics, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.1 2 Replies

Lothar Schmid
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I 'm doing a laminar flow simulation and want to introduce a volume force. I found an option for a constant volume force.

However, I want to introduce a position-dependent volume force. How can I achieve this?

Thanks.


PS: I'm using comsol 4.1
2 Replies Last Post 3 mag 2012, 10:44 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 3 mag 2012, 10:41 GMT-4
Hi

if you enter 100[N] in a field its constant for all x,y,z oer the selected range, if you write 100[N]*x/X_tot where X_tot[m] is a total X length you will have a linear increasing force going from 0 to 100 as x goes from 0 to X_tot (assuming it starts at x=0, else correct for the offset

--
Good luck
Ivar
Hi if you enter 100[N] in a field its constant for all x,y,z oer the selected range, if you write 100[N]*x/X_tot where X_tot[m] is a total X length you will have a linear increasing force going from 0 to 100 as x goes from 0 to X_tot (assuming it starts at x=0, else correct for the offset -- Good luck Ivar
Lothar Schmid
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Posted: 1 decade ago 3 mag 2012, 10:44 GMT-4
Thanks. I'll try that.

Where can I find a list / documentation about variables / functions syntax?

Best Regards,
Lothar
Thanks. I'll try that. Where can I find a list / documentation about variables / functions syntax? Best Regards, Lothar

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