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Volume Fraction

Posted Jan 17, 2012, 3:20 p.m. EST Fluid & Heat Version 4.2 2 Replies

Osameh Ghazian
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Hi,
Is the Volume fraction In Fluid module based on the whole domain ? I have a geometry consists of 3 domains, two of them are fluids and the third one is solid. I think the definition of tpf.Vf1 is based on the volume of the whole geometry, Solid+liquid. I want to define the parameter based on the tpf.Vf1, but it gives me error , cause of the solid part.
2 Replies Last Post Jan 18, 2012, 11:58 p.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Jan 18, 2012, 12:47 a.m. EST
Hi

to get the volume of a domain: define an integration operator i.e intop1() and in your fomula (or define a variable) use

Vol =intop1(1)

--
Good luck
Ivar
Hi to get the volume of a domain: define an integration operator i.e intop1() and in your fomula (or define a variable) use Vol =intop1(1) -- Good luck Ivar
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Jan 18, 2012, 11:58 p.m. EST
I believe tpf.Vf1 is the volume fraction of fluid one in a two-phase fluid model. It is a field variable not a total quantity and gives the volume fraction at any point in the fluid domain. If you define a parameter based on this variable that parameter cannot be evaluated in the solid region since it does not have the “tpf” physics. If you want the total volume fraction you need to integrate as Ivar described.

Nagi Elabbasi
Veryst Engineering
I believe tpf.Vf1 is the volume fraction of fluid one in a two-phase fluid model. It is a field variable not a total quantity and gives the volume fraction at any point in the fluid domain. If you define a parameter based on this variable that parameter cannot be evaluated in the solid region since it does not have the “tpf” physics. If you want the total volume fraction you need to integrate as Ivar described. Nagi Elabbasi Veryst Engineering

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