Example turbulent backstep
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Example: Turbulent backstep. Turbulent backstep. Turbulent backstep. Free surface. Inflow. Outflow. Wall functions. Simulations have been made for a simple backward facing step test case.

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Example: Turbulent backstep

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Example turbulent backstep

Example:Turbulent backstep


Turbulent backstep

Turbulent backstep

Turbulent backstep

Free surface

Inflow

Outflow

Wall functions

  • 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.


Results

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.


Results recirculation path can be visualized in cross sectional plots

Turbulent backstep - Results

Results, recirculation path can be visualized in cross-sectional plots

Velocity inx-direction

Distance from the step’s corner

Modulus ofthe velocityvector


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