Validation

An excellent way of validating simulations is by comparing them to research papers which are relevant. Since the Ahmed body is so widely studied and used as validation, it is not difficult to find supporting evidence. For this tutorial, the information gathered from the simulation will be compared to “Embedded Large Eddy Simulation of Flow around the Ahmed Body” by Domenico Caridi done in ANSYS FLUENT. Below is a contour of the pressure on the rear surface of the Ahmed body. This can be compared to our model by creating a similar contour in our simulation.

Add a Contour from the Add drop down menu and select the top, side and rear faces as the Location. After changing the Variable to Pressure, the following contour plot will be created.

While qualitatively similar, the numerical results are significantly different than those found in the validation. By refining the mesh, the results can be calculated to a more accurate degree. Go back to the Mesh task in the workflow and increase the Mesh resolution all the way up. Go back to the Results and press Evaluate Results. Travel back to the Pressure contour.

By comparing this contour with the contour from the validation paper, we can see that they are extremely similar. The minimum and maximum values are much closer to those found in the validation paper.

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