Symmetry

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The boundary condition prescribes no heat flux, no penetration and vanishing shear stresses. The boundary condition is a combination of Dirichlet conditions and a Neumann condition.


	These conditions correspond to the ones for the Single-Phase Flow, Laminar Flow interface. See Inlet and Outlet. For a background on the derivation and implementation of the conditions, see Theory for the High Mach Number Flow Interfaces.


	Selecting appropriate outlet conditions for the Navier-Stokes equations is not a trivial task. Generally, if there is something interesting happening at an outflow boundary, extend the computational domain to include this phenomenon.