I took a brief look at your model.
You seem to have a road surface at the top laid on what must be a concrete deck that is supported on a corrugated side wall and a bottom plate.
The road surface seems to have many faces/edges on the top.Â
Go into SpaceClaim and on the Repair tab, click the Extra Edges and get rid of all these extra edges.
The first problem is none of these bodies are connected. The second problem is there is only one element through the thickness. The third problem is the one element is Linear due to the fact that the Mesh Details is set to CFD. How did that happen? Change that back to Mechanical and the default will be Quadratic elements.
To correct these problems, I suggest you open the geometry in SpaceClaim. Put the two bodies for the road and deck in a single component and on the Workbench tab, click the Share button so that the road will be connected to the deck.
The second problem can be addressed in Mechanical by setting the Mesh settings to Sweep or Multizone to put at least 2 elements through the thickness of every body.
You are navigating away from the AIS Discovery experience