VMFL013
VMFL013
Turbulent
Flow with Heat Transfer in a Backward-Facing Step
Overview
| Reference | J.C. Vogel, J.K. Eaton, "Combined Heat Transfer and Fluid Dynamic Measurements Downstream of a Backward-Facing Step". Journal of Heat Transfer, Vol. 107, pp. 922-929, 1985. | ||
| Solver | Ansys Fluent, Ansys CFX | ||
| Physics/Models | Incompressible, turbulent flow with heat convection and reattachment. | ||
| Input File |
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| Project Files | Link to Project Files Download Page |
Test Case
The fluid flow and convective heat transfer over a 2–D backward-facing step is modeled. A constant heat-flux surface behind the sudden expansion leads to a separated and reattaching boundary layer that disturbs local heat transfer. Measured values of the distribution of the local Nusselt number along the heated wall are used to validate the CFD simulation.
| Material Properties for Dry Air | Geometry | Boundary Conditions |
|---|---|---|
|
Density = 1 kg/m3 Viscosity = 0.0001 kg/m-s Conductivity = 1.408 W/m-K Specific Heat = 10,000 J/kg-K |
H = 1 m |
Velocity profile at inlet corresponding to ReH = 28,000 Wall heat transfer, Q˙= 1,000 W/m2 |
Analysis Assumptions and Modeling Notes
A Cartesian non-uniform 121 x 61 mesh is used. The flow is steady and incompressible. Fluid properties are considered constant. Pressure based solver is used. The inlet boundary conditions are specified using the fully-developed profiles for the U-velocity, k, and epsilon. The incoming boundary layer thickness is 1.1 H. Under the given pressure conditions, the Reynolds number, ReH is about 28,000 The RNG k-ε model with standard wall functions is used for accounting turbulence.
