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How to apply non-uniform boundary load

Posted Dec 31, 2014, 11:04 p.m. EST 2 Replies

Thomas Nunes
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I'm new to COMSOL and have been trying to build a septic tank model, in which I want to apply a load that starts at 0 (on the top lid of the tank) and increases to a known value -P at the bottom, as shown on the attached sketch. I'm using 2D axissymetric. How should I proceed to do so?

Thanks in advance.
2 Replies Last Post Jan 3, 2015, 12:20 p.m. EST
Lasse Murtomäki
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Posted: 10 years ago Jan 2, 2015, 3:16 a.m. EST
Write an equation in the boundary condition box. For example, if the z coordinate runs from 0 (bottom) to H (lid) and pressure changes linearly, write

p*(1 - z/H)

br
Lasse
Write an equation in the boundary condition box. For example, if the z coordinate runs from 0 (bottom) to H (lid) and pressure changes linearly, write p*(1 - z/H) br Lasse
Thomas Nunes
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Posted: 10 years ago Jan 3, 2015, 12:20 p.m. EST
Thanks, sir. I actually had a similar thought yesterday with P*(z/H), but for that to work I had to draw the geometry upside down. Now the problem is solved.

Thanks, sir. I actually had a similar thought yesterday with P*(z/H), but for that to work I had to draw the geometry upside down. Now the problem is solved.

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