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BounceBack boundary

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  • #5843
    Gloriousface
    Participant

    Hello ,everyone

    Is the BounceBack scheme in bstep2d flow standard BounceBack?

    #5844
    Adrian
    Keymaster

    How do you define standard Bounce Back? OpenLB’s bounce back dynamics implement fullway bounce back (i.e. the populations are locally reverted during collision and not at streaming time).

    #5845
    Gloriousface
    Participant

    Thank you very much for your reply. What I mean by the standard BounceBack is that the particles bounce directly at the boundary, and the boundary is at the grid point, rather than half step bounce by pushing half of the grid inward. I don’t know whether the standard BounceBack realized in OpenLB is what I mean ?

    #5847
    Adrian
    Keymaster

    Bounce back implemented as dynamics in OpenLB (i.e. as a local collision step) provide “fullway” bounce back. “Halfway” bounce back (implemented using a PostProcessor / Streaming modification) reflects the populations during streaming and e.g. requires no solid nodes. Both of them model a boundary mid way between grid points.

    You can read more details in e.g. Krüger et al. “The Lattice Boltzmann Method: Principles and Practice” Section 5.3.3.2.

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