Physics Setup

Boundary Conditions / Forces

First, the inlet must be defined using the Fluid Flow Conditions. In the Add drop down menu by Fluid Flow Conditions, select Inlet. Then, using the face selection tool, define an inlet at the face upstream of the Ahmed body. The front of the body is the taller end with the rounded edges and corners. Make sure to input the Velocity magnitude as 40 m/s.

Once the inlet is defined, the outlet is next. In the same Add menu, use the Outlet condition to define an outlet downstream of the body. Assign a Gauge static pressure of 0 psi.

Create openings for the sides of the flow volume by selecting Opening in the Add drop down menu. Select the top and side faces of the flow volume, and input 0 Pa for the Gauge entrainment pressure.

Add a Symmetry condition from the Add drop down menu to the midplane of the flow volume.

A Wall condition needs to be added to the bottom enclosure face that is moving at the same speed and direction as the inlet. In the Add menu, select Wall then assign the bottom face as the Location and change Option to Moving. Input the Magnitude as 60 [m s^-1], 1 for X under Cartesian Direction Components and 0 for Y and Z.

Press Solve Physics in the Physics template to run the calculations, then move on to the next step.

Go to Step 5: Results

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