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Navier Slip Boundary condition

Posted 10 lug 2023, 15:16 GMT-4 1 Reply

Sagar Hussain Sabuz
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For laminar single phase flow through microchannel, When I put inlet and outlet condition: fully developed and wall as: No slip, I get fully developed profile from the very entrance of the channel. However when I Change the wall condition to Navier slip [20nm] while keeping both the inlet and outlet condition same, I dont get the fully developed profile from the very inlet.

Could anyone please explain the issue?

1 Reply Last Post 10 lug 2023, 15:50 GMT-4
Jim Freels mechanical side of nuclear engineering, multiphysics analysis, COMSOL specialist
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Posted: 1 year ago 10 lug 2023, 15:50 GMT-4

Certainly. A no-slip wall specifies a zero velocity at the wall as a constraint; whereas a slip wall will not. As such, the slip wall has no constraint in the wall-normal direction except the zero gradient which is present as a "natural" condition of the weak form used by the finite-element method.

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James D. Freels, Ph.D., P.E.
Certainly. A no-slip wall specifies a zero velocity at the wall as a constraint; whereas a slip wall will not. As such, the slip wall has no constraint in the wall-normal direction except the zero gradient which is present as a "natural" condition of the weak form used by the finite-element method.

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