Surface wrap on Automotive Assembly

Objective:

The main purpose of this project is to perform topo clean-up on CAD models of the Engine, gearbox, and transmission, defeature the models for CFD, and finally make CFD mesh around them using the surface wrap utility.

PART I: Engine

• The imported CAD model for the engine is shown below. Its topology needs to be cleaned up so that the actual geometry is clearly visible.
• The model after topology cleanup is shown below.
• The actual geometry has some small holes which will consume a lot of computational resources without any impact on simulation fidelity. Hence, these holes are closed before meshing.
• Also, the belts are removed for mesh simplicity.

• The other models, gearbox, and transmission have relatively cleaner CAD models than the engine.
• So we will merge all three components and clean up any excess features for ease.
• The geometry after closing all gaps and making a water tight geometry is shown below.
• We will use constant element length surface wrap.
• It can be seen that no leaks are present on the outer surface of assembly.
• All the PIDs are selected for meshing as shown.
• A Mesh length of 3 mm was chosen for proper geometry capture & reasonable meshing duration.
• The generated surface wrap is shown below.