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In order to create an area around the backwards facing step where air will move, an enclosure must be made around it to ensure that there is a volume which can be later meshed. Press Geometry in the workflow tab and select Edit Geometry in the Geometry template. The Enclosure tool can be found in the Analysis section of the toolbar under the Prepare tab. Select the step body and a box will appear around it to be edited. Uncheck the Symmetric dimensions box and change the height of the enclosure to be 0.2m, then change all other values to zero. Use the picture below for guidance. Press the green checkmark and the enclosure will be generated.

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Suppress

Now that the geometry of the flow volume has been created, we can suppress the step from the physics calculation. Right click the solid in the geometry tree and select Suppress for Physics. 

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