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Meaning for some parameters

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Hi, I am doing some simulation about microfludics and I used laminar flow, however, I don't understand some terms. What's the meaning for 'Entrance thickness'? I used 2D simulation.
Looking forward to your reply!

3 Replies Last Post 18.07.2015, 10:30 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 9 years ago 17.07.2015, 02:56 GMT-4
Hi

I'm not 100% sure I get this right, but are you aware that all 2D simulations are in fact 3D models for which you define the depth Z (in the paper direction).

For most physics this depth is normalised to 1[m] but if you enter absolute values for flux on the boundaries such as an absolute flow, through a 2D boundary = edge you need to define the section (Z depth) and that is what I suspect you are referring to. There might be different "depths" for different entities in your model too

--
Good luck
Ivar
Hi I'm not 100% sure I get this right, but are you aware that all 2D simulations are in fact 3D models for which you define the depth Z (in the paper direction). For most physics this depth is normalised to 1[m] but if you enter absolute values for flux on the boundaries such as an absolute flow, through a 2D boundary = edge you need to define the section (Z depth) and that is what I suspect you are referring to. There might be different "depths" for different entities in your model too -- Good luck Ivar

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Posted: 9 years ago 18.07.2015, 10:08 GMT-4
Hi,
Yes, it is what you says. When I am defining an inlet for a laminar flow, I need to enter the 'entrance thickness' for the inlet. So I am sure this time and thank you for your timely help!

Best regards,
Jun
Hi, Yes, it is what you says. When I am defining an inlet for a laminar flow, I need to enter the 'entrance thickness' for the inlet. So I am sure this time and thank you for your timely help! Best regards, Jun

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Posted: 9 years ago 18.07.2015, 10:30 GMT-4
Hi,
One more question. Since in 2D simulation, we need to define the entrance thickness for one specific plane, so is it supposed that the plane must be the base of 3D? Thanks.

Yours
Jun
Hi, One more question. Since in 2D simulation, we need to define the entrance thickness for one specific plane, so is it supposed that the plane must be the base of 3D? Thanks. Yours Jun

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