Reply To: Dynamic Mesh – Negative Cell Zone Detected

[Federico]

Hello, 

hex-mesh is not compatible with remeshing, which is why your are seeing streched out elements on the left and compressed elements on the right, which eventually result in collapsed cells or negative volume elements.

You will need to mesh the volume surrounding the car with tetrahedral cells. An alternative would be to have a structured block of hex cells around the car and use the layering approach.