Cd of car simulation did not work

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I made this shape, I want the drag coefficient in ground effect.

There was no option to make an inlet or outlet or ground wall in the box.

The simulation failed.

How can I do this?

Hello vertualedge,

Thanks for reaching out to us here in the forum. In order to set up a Simulation for a Vehicle please have a look at this tutorial, which explains the complete simulation setup.

Best regards
Sebastian