Turbulent Heat Transfer Over a Backward-Facing Step: Solution to a Benchmark Problem


This paper presents a numerical solution to a two-dimensional turbulent convection flow over a backward facing step. The work is done in response to a technical session for a benchmark problem at the 1994 ASME Winter Annual Meeting. The backward facing step geometry is formed in a duct with expansion ratio of 2.5 and a step height of 3 cm. The lower wall downstream of the step is heated by a constant flux of 5000 W / m2 and the opposite wall of the duct is maintained adiabatic. The wall forming the step is adiabatic and the lower wall upstream of the step is considered as either adiabatic or heated with a constant flux of 5000 W / m2. Results are presented for a Reynolds number ReH = 20,000 and Prandtl number Pr = 0.71. The RNG k-ε turbulence model along with FLUENT CFD code is utilized to simulate the flow and heat transfer in this geometry. A non-staggered grid finite volume method is used to solve the governing equations and multi-grid system is adopted to accelerate the numerical convergence. Cross stream results at seven axial locations and wall variables at the lower and upper walls are reported.


Mechanical and Aerospace Engineering

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Article - Journal

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© 1994 American Society of Mechanical Engineers (ASME), All rights reserved.

Publication Date

01 Jan 1994

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