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flow boundary conditions: periodic velocity fall and normal velocity zero
Posted Jan 2, 2013, 6:50 p.m. EST Fluid & Heat, Computational Fluid Dynamics (CFD) Version 4.2a 2 Replies
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I am attempting to simulate a 2D flow of a suspension of solid disks on a square lattice. To reduce the computational expense of this simulation, I'd like to consider shear on a single disk at rest. See the attached diagram that depicts the computational domain. To find the effective viscosity of the suspension, boundary conditions must be as follows:
1. Periodic velocity field at east and west faces of primary cell.
2. Equal and opposite x-direction velocity component, u, on north and south faces of the primary cell. Note that this velocity component also depends on the coordinate y.
3. Identically zero y-direction velocity component, v, on north and south faces of the primary cell.
Boundary condition #1 I am able to implement, but I cannot find any way to implement condition #2 in conjunction with #3 for the north and south faces. Would greatly appreciate your advice on how to implement this in a simple way in the COMSOL single-phase flow module.
Kind regards,
Kyle
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Note that this velocity component also depends on the coordinate y.
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but in 2D you have no control on the depth (or rather layer possibility on the depth. I would rather propose to start in 2D-axi, with a cut perpendicular to your view
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Good luck
Ivar