An ES-BGK model for polyatomic gases in rotational and vibrational nonequilibrium

We propose an extension of the Ellipsoidal–Statistical BGK model to account for discrete levels vibrational energy in a rarefied polyatomic gas. This satisfies H-theorem and contains parameters that allow fit almost arbitrary values Prandtl number relaxation times rotational energies. With reduced distribution technique, this can be three system could used simulate gases with computational cost close simple monoatomic