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Global Knudsen number calculation

Global Knudsen number calculation. Since c=sqrt(8/Pi*gamma)*a, average gas molecule speed From kinetic theory, molecular mean free path is related to myu: Myu = 0.499*rho*c*L Cons: L/d = 1.49 M / Re=Kn (global) Ref: Journal of the Aeronautical Sciences, April 1951, pp259-270.

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Global Knudsen number calculation

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  1. Global Knudsen number calculation • Since c=sqrt(8/Pi*gamma)*a, average gas molecule speed • From kinetic theory, molecular mean free path is related to myu: • Myu = 0.499*rho*c*L • Cons: L/d = 1.49 M / Re=Kn (global) • Ref: Journal of the Aeronautical Sciences, April 1951, pp259-270

  2. Local Kn number calculation • Density based local Kn number: • Kn = abs(grad(rho))*L/rho • Where rho – local density • Ref: Phys. Fluids & (1), Jan 1995

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