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Lattice Boltzmann Method (material properties)

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  • This topic has 2 replies, 2 voices, and was last updated 1 year ago by H.Yu.
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  • #7155

    Hi all,
    I’m just starting out and studying the Lettice Boltzmann method. However, as I was researching, a few questions came to my mind.

    What I’m curious about is the velocity, the viscosity coefficient, Reynolds.

    For air in general (Temperature = 293K)
    density = 1.2 [kg/m^3]
    kinematic viscosity = 1.825 * e^-5 [kg/ms]
    Reynolds number = ((density*U*L)/kinematic viscosity) [-]

    Lattice Boltzmann Method
    C_s (speed of sound)
    C_s = (1/sprt(3))*((delta X)/(delta t))
    dynamic viscosity = c_s^2 *(relaxation_time – ((delta t) / 2)) <<< (Chapman Enskog eq)

    I saw the contents. Which of the first and second is suitable for the Lattice Boltzmann Method?


    The Reynolds number = ((U*L)/kinematic viscosity) [-] as always. Just consider LBM as a solver vor the incompressible Navier Stokes Equation, speaking about Re. It can also be seen as solver of other equations.


    Thank you!

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