Unsteady LES of a Backward Facing Step Flow.

The paper proposes a numerical technique based on the finite volume method for solving the three-dimensional unsteady viscous over a backward facing step. The mathematical model is based on the momentum and continuity equations written for the uncompressible viscous flow. Closure to the turbulence is considered by employing the LES model. The convergence of the unsteady solution is realized through an iterative process within the limits of an error imposed apriori. The engineering application spectrum is represented by the several practical flow cases over sudden expanded domains. The study emphasizes the 3D vortical character of the flow that was observed during the experiments. The theoretical relevance of the work consists in the originality of the numerical method employed to solve the aforementioned equations. [ABSTRACT FROM AUTHOR]