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Confused by the 3 velocity components in a 2d domain.

Posted Jan 30, 2024, 7:36 a.m. EST 2 Replies

Sumit Sinha
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I am new to comsol and I am trying to solve a multi-phase viscoelastic flow on a two dimensional domain. I am a bit confused by the fact that when I add the 2D space dimension, and select the viscoelastic flow module, I get 3 velocity components instead of two. Is this normal or there is an error? I am using comsol 6.1.

2 Replies Last Post Jan 31, 2024, 10:22 a.m. EST
Robert Koslover Certified Consultant
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Posted: 9 months ago Jan 30, 2024, 9:19 a.m. EST
Updated: 9 months ago Jan 30, 2024, 9:19 a.m. EST

A calulation in a 2D space does not preclude a vector solution with a non-zero component of that vector perpendicular to the plane. Consider, for example, if you were modeling fluid flow in a long pipe oriented along the z-direction, and your model was in the x-y plane. Solving for would be a perfectly reasonable thing to do.

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Scientific Applications & Research Associates (SARA) Inc.
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A calulation in a 2D space does not preclude a vector solution with a non-zero component of that vector perpendicular to the plane. Consider, for example, if you were modeling fluid flow in a long pipe oriented along the z-direction, and your model was in the x-y plane. Solving for v_{z}(x,y) would be a perfectly reasonable thing to do.
Sumit Sinha
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Posted: 9 months ago Jan 31, 2024, 10:22 a.m. EST
Updated: 9 months ago Jan 31, 2024, 10:11 a.m. EST

Thanks a lot. I don't know what I was thinking. :)

Thanks a lot. I don't know what I was thinking. :)

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