Turbulent Boundary Layers Without Coupling of the Velocity Field to the Temperature Field
In this chapter we will look at turbulent plane flows with constant physical properties. As has already been explained in Sect. 16.6, turbulent flows also have boundary-layer character at high Reynolds numbers, i.e. the entire flow field consists of the inviscid outer flow and the thin turbulent boundary layer close to the wall, for which the boundary-layer equations (16.34) to (16.36) hold. However these equations do not form a closed system. A turbulence model is required for the so-called closure problem; this presents additional equations which connect the turbulent shear stress τ t (and the turbulent heat flux q t ) with the mean motion (or with the mean temperature field).
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