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How can I apply the feature of 'Enclosed cavity' for expansion air by heating?

Posted Jul 14, 2024, 11:11 a.m. EDT Fluid & Heat, Heat Transfer, Structural Mechanics Version 6.2 0 Replies

Hyeontak Kim

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Hello, I'm trying to make a model of sealed crucible filed with air. I set the heat flux on the top of the crucible to heat it and so does the air which is in the crucible. The air get expansion, and the inside wall of the crucible get pressure as load. So I choose the physics :

Heat transfer in solids and fluids --> about the crucible and air / Structure mechanics --> about the crucible / -->Multiphysics - Thermal expansion --> about the crucible

In Structure mechanics, I set the "Boundary load" = P1(T/T1)/(1+3alpha*(T-T1)) T1 = initial temperature / P1 = initial pressure / alpha = coefficient of thermal expansion of crucible The equation of boundary load means the pressure load considered the thermal expansion of the crucible.

COMSOL 6.2 released the feature of "Enclosed Cavity" which can simulate the volume change by pressure load. But when I apply this feature, it doesn't work. I saw some examples about 'enclosed cavity' (Hyperelastic Seal & Biventricular Cardiac Model tutorial models), they have something in common that the volume changes by force but not the air expansion.

How can I apply the 'enclosed cavity' to simulate the pressure load by air expansion? Would it be accurate to proceed the way I originally did?

Best,

Hyeontak Kim

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