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How To add Gravity in Conjugate Heat Transfer???
Posted Jul 18, 2010, 9:46 p.m. EDT 1 Reply
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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
Any help would be very apreciated
1 Reply Last Post Jul 19, 2010, 2:42 a.m. EDT
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Posted:
1 decade ago
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
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