BACKWARD FACING STEP
The backward facing step is a well know benchmark calculation to test the ability of a numerical code to model sensitive recirculation zones in velocity dominated flow problems (high Reynolds number). Since such calculations require some stabilization method to guarantee wiggle free solutions, it is a good test to see if the recirculations zone is not suppressed by the stabilization method.
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The first picture shows the results of the velocity profile. Behind the step the recirculation zone matches accurately the desired value. |
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The second picture displays the shear stress as found in the calculations. The main shear stress is, as to be expected, present in the narrow in-flow channel. |