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MRT transformation matrix

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OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › MRT transformation matrix

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  • December 1, 2022 at 9:27 am #7059
    Mike
    Participant

    Dear developers,
    I notice that D2Q9 MRT transformation matrix in mrtLatticeDescriptors.h is different from that in the literature “Viscous flow computations with the method of lattice Boltzmann equation”, and when I try both transformation matrices, I find that the latter goes wrong while the former seems fine, I wonder why this happens?
    Yours Sincerely,
    Mike

    December 1, 2022 at 11:42 am #7061
    stephan
    Moderator

    Dear Mike,

    thanks for your comment.
    The difference in the code is due to a different ordering of discrete velocities (columns) and moment polynomials (rows).

    BR
    Stephan

    December 1, 2022 at 2:02 pm #7062
    Mike
    Participant

    Dear stephan,

    thanks for your reply!

    BR
    Mike

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