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  • General query regarding wall boundary conditions

    Posted by Aditya on September 19, 2023 at 11:58 am

    Hi,

    I have a general query regarding the wall boundary conditions.

    For example, when we simulate a flow over a 3D cylinder, we give a ‘0 slip’ wall boundary condition next to the cylinder wall. However, we provide a ‘0 shear ‘ wall boundary condition for the enclosure walls.

    From my understanding, 0 slip means the cells next to the walls take the velocity of the wall cells.

    Could someone please explain the difference between the two?

    Thanks

    Sandeep replied 9 months ago 2 Members · 1 Reply
  • 1 Reply
  • Sandeep

    Administrator
    September 19, 2023 at 12:36 pm

    This is a good question.
    1. When we say zero slip, that means at the wall, there is no velocity (no slip condition). This will lead to significant velocity gradient from the wall and formation of the boundary layer.
    2. When we use zero shear, that means the velocity gradient is zero. So you don’t have any boundary layer. This usually added at symmetry boundaries or walls of enclosures where we are not interested in the wall boundary layers (we are focused on the test section inside the enclosure). Symmetry is actually zero shear + normal component of velocity =0.

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