Basics of Aerothermodynamics

Chapter 12: Governing Equations for Flow in General Coordinates

Overview

We collect the transport equations for a multi-component, multi-temperature [8] non-equilibrium flow. All transport equations have been discussed in Chapter 4, as well as in Chapters 5, 6, 7 (see also [1], [2], [3]). We write the equations in (conservative) flux-vector formulation, which we have used already for the energy equation in Sub-Section 4.3.2, and for three-dimensional Cartesian coordinates:


Q is the conservation vector, E, F, G are the convective (inviscid) and E uisc F uisc, G uisc the viscous fluxes in x, y, and z direction. S is the source term of mass and of vibration energy.

The conservation vector Q has the form:


where ? i, are the partial densities of the involved species i, Section 2.2, ? is the density, u, v, w are the Cartesian components of the velocity vector V, e t = e + 1/2 V 2 is the mass-specific total energy ( V = V), Sub-Section 4.3.2, and ?e uibr,m the mass-specific vibration energy of the molecular species m. The convective and the viscous fluxes in the three directions read:




The convective flux vectors E, F, G represent from top to bottom the transport of mass, Sub-Section 4.3.3, momentum, Sub-Section 4.3.1, of total energy, Sub-Section 4.3.2, and of non-equilibrium vibration energy [9], Section 5.4. In the above h t = e t

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