1. Example: Turbulent backstep

2. Turbulent backstep Turbulent backstep
Simulations have been made for a simple backward facing step test case.
The aim of the model is to try to match the length of the recirculation zone with experimental data and compare with other simulations.
A coarse mesh with 1040 elements was used in the simulations.
Inflow
Outflow
Wall functions
Free surface

3. Results Turbulent backstep - Results
About 80% agreement of the recirculation zone length is found.
The discrepancy is mostly due to the inadequacies of the k- turbulence model.
Other turbulence models and/or corrections may improve matters.

4. Results, recirculation path can be visualized in cross-sectional plots
Turbulent backstep - Results
Results, recirculation path can be visualized in cross-sectional plots
Velocity in x-direction
Distance from the step’s corner
Modulus of the velocity vector