Skip to content

Lattice Boltzmann Method (material properties)

OpenLB – Open Source Lattice Boltzmann Code Forums on Lattice Boltzmann Methods General Topics Lattice Boltzmann Method (material properties)

  • This topic has 2 replies, 2 voices, and was last updated 1 year ago by H.Yu.
Viewing 3 posts - 1 through 3 (of 3 total)
  • Author
    Posts
  • #7155
    H.Yu
    Participant

    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.

    1.
    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) [-]

    2.
    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?

    #7156
    mathias
    Keymaster

    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.

    #7157
    H.Yu
    Participant

    Thank you!

Viewing 3 posts - 1 through 3 (of 3 total)
  • You must be logged in to reply to this topic.