Interaction of two opposite conical curved wall jets

Two opposing plane turbulent jet flows along a planar surface interact severely in the collision zone above the stagnation point and thereafter form a plane fountainlike merged jet perpendicular to the surface. Direct numerical simulations have been performed to explore the physics of the turbulence field in the collision zone and in the fountain jet formed as a merger of the two originally countercurrent jet streams. It is observed that the turbulence level is exceptionally high in the collision zone, i.e., just above the high-pressure stagnation region. This is ascribed to excess mean shear production arising from the streamline curvature of the bending jets. The turbulence is therefore far from equilibrium and the kinetic energy production exceeds its dissipation rate by a factor of 3. Mean-velocity profiles and second-order moments in the fountain jet compare well with measured data in similar flows. The growth rate of the fountain jet is about 0.15, which is 50% higher than the spreading rate of a conventional plane jet. Several physical aspects of this flow are hard to accommodate in Reynolds-averaged Navier-Stokes-based turbulence models. To facilitate the strive towards better turbulence closures, data fields for all terms in the kinetic energy budget are provided in this paper.

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Interaction of two opposite conical curved wall jets

Cited by 5 publications

References 9 publications

Numerical and experimental study of two turbulent opposed plane jets

Numerical and experimental study of two turbulent opposed plane jets

Heat transfer — a review of 1996 literature

Direct numerical simulation of two opposing wall jets

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