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How To add Gravity in Conjugate Heat Transfer???

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Hi I'm trying to add gravity to a problem with natural convection. But I don't know how.
Any help would be very apreciated

1 Reply Last Post 19 juil. 2010, 02:42 UTC−4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 19 juil. 2010, 02:42 UTC−4
Hi
I remember that I was very upset not finding the "gravity" click option when I started with Comnsol. But with COMSOL the rule is THINK Physics.
So gravity is a "Body Force" expressed as F=G*rho.smsld (in 3.5) and F=g_const*solid.rho in v4, F are in [N]. Where I usually define G as a constant G=1[lbf]/[lb] if it's earth gravity we talk about. "g_const" is predefined in V4. It's the same logic that loads are given as pressures p[Pa]=F[N]/(Area[m^2]

--
Good luck
Ivar
Hi I remember that I was very upset not finding the "gravity" click option when I started with Comnsol. But with COMSOL the rule is THINK Physics. So gravity is a "Body Force" expressed as F=G*rho.smsld (in 3.5) and F=g_const*solid.rho in v4, F are in [N]. Where I usually define G as a constant G=1[lbf]/[lb] if it's earth gravity we talk about. "g_const" is predefined in V4. It's the same logic that loads are given as pressures p[Pa]=F[N]/(Area[m^2] -- Good luck Ivar

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