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Double integration

Posted Sep 26, 2018, 6:46 a.m. EDT 1 Reply

Husam Walwil
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Hello; is there anyway in comsol to conduct double integration on x and y coordinates. I am trying to use "integrate" expression, but i can only define one variable. Another inquiry, when we use surface integration, what are the limits of integration?

Thank you in advance, HM

1 Reply Last Post Sep 28, 2018, 7:05 p.m. EDT
Robert Koslover Certified Consultant
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Posted: 6 years ago Sep 28, 2018, 7:05 p.m. EDT
Updated: 6 years ago Sep 28, 2018, 7:06 p.m. EDT

I think that I can answer the second part of your question. When you use surface integration, the limits are usually the boundaries (aka, edges) of the specific surface (or set of surfaces) that you have selected when defining/applying the surface integration. Typically, depending on how/where in the user interface that you are specifying this, and what you do with the mouse, the surface in question will be highlighted on your display. For example, select a surface and integrate the quantity "1" over that surface. Your result will be the area of that surface, which is as it should be.

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
I think that I can answer the second part of your question. When you use surface integration, the limits are usually the boundaries (aka, edges) of the specific surface (or set of surfaces) that you have selected when defining/applying the surface integration. Typically, depending on how/where in the user interface that you are specifying this, and what you do with the mouse, the surface in question will be highlighted on your display. For example, select a surface and integrate the quantity "1" over that surface. Your result will be the area of that surface, which is as it should be.

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