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  3. Cell Convective Courant Number in ANSYS Fluent Postprocessing – How is it being evaluated? Does it rely on a cubic root of a cell volume as a length scale?

Cell Convective Courant Number in ANSYS Fluent Postprocessing – How is it being evaluated? Does it rely on a cubic root of a cell volume as a length scale?

Tagged: 19.2, fluent, fluid-dynamics, General, General - FLUENT
    • January 25, 2023 at 7:16 am
      FAQFAQ
      Participant

      The Courant number is based on the cell volume, but not via the cubic root. In the expression: Co = U * dt / delta, the ratio of the velocity and length scales, U / delta, is approximated as the mass flux coming into the cell, divided by the density and the cell volume. For example, in a simplified case of a a Cartesian mesh with a flow along the X-axis, the Courant number becomes, U_x * dt / dx, because the mass flux = rho * U_x * dy * dz.

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