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The 2D laminar backward facing step is a widely encountered benchmark for CFD code testing. The present example features a mesh size of 0.05 and a Reynolds number of 800. The second order steady state solver is used.

References :

[1] B. F. ARMALY, F. DURSTS, J. C. F. PEREIRA  AND B. SCHONUNG , Experimental and theoretical investigation of backward-facing step flow, Institute of Hydromechanics, Section I11 : Mechanics of Turbulent Flows, University of Karlsruhe, KaiserstraBe 12, D-7500 Karlsruhe, F.R.G.

[2] EXPERIMENTAL AND NUMERICAL INVESTIGATION OF 2-D BACKWARD-FACING STEP FLOW. T. LEE AND D. MATEESCU Department of Mechanical Engineering, McGill University, Montreal, Quebec, Canada

[3] E. Erturk,Numerical solutions of 2-D steady incompressible flow over a backward-facing step, Part I: High Reynolds number solutions,Gebze Institute of Technology, Energy Systems Engineering Department, Gebze, Kocaeli 41400, Turkey