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ISSN オンライン: 2642-0554

SCALAR-FIELD PROBABILITY DENSITY FUNCTIONS AND CONDITIONAL EXPECTATIONS IN UNIFORMLY SHEARED TURBULENCE

Amir Behnamian
Department of Mechanical Engineering University of Ottawa Ottawa, Ontario, Canada

Stavros Tavoularis
Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario KIN 6N5, Canada

要約

The statistical properties of the velocity and scalar fields, including all three scalar derivatives, were measured simultaneously in nearly-homogeneous, uniformly sheared turbulence with two passively superimposed, non-homogeneous, scalar fields, namely a thermal mixing layer and the plume of a heated line source. The scalar probability density functions were sub-Gaussian in both scalar fields and the velocity expectations conditioned on the scalar values were non-linear. The conditional scalar dissipation rate was strongly anisotropic and could not be surrogated by any of its three parts along the three axes.