Week 5 Challenge : Surface wrap on Automotive Assembly

AIM:

To learn about surface wrapping around an assembly, which is surface meshing along the entire volume. For the given model we need to do topo clean up and merge all the 3 components and then perform meshing

 The CAD models to which can be found here.

ENGINE

GEARBOX

TRANSMISSION

Target length = 3mm

 

INTRODUCTION:

Surface wrap is the process of meshing where the designer is only interested in the outside surface of the assembly i.e., the component inside the volume will be kept as it is. This kind of meshing is only used for the simulation in which we are interested in the outer surface only like external flow simulations

MODEL:

ENGINE:

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As we can see there are many rings like surface which don’t look like of any use as this ring are used by designer sometime to create fillets in the model so we need to delete all those surfaces which don’t have any significance Now, in wrap meshing the interior part is not that important so we don’t need to worry about all the single cons or all the overlap surfaces but it is good practice to delete all the unwanted surfaces so make the geometry as fine as we can  

MODEL:

For the above model we need to start with deleting the rings on every fillet

An easy way to so look at all the rings quickly we can use NOT Option with PID selection and we can hide the important parts by which we can see all the rings clearly and then we can carefully delete the unwanted surfaces

Also, the above pipes which can be seen as overlap surfaces are not important so can be deleted also in wrap meshing the part which has small thickness can be deleted as we are using same target length for all the parts

Like this belt

After deleting and closing all the open holes, closing all the holes is important as in wrap meshing the outer surface will be selected and if the opening and it will mesh it from inside which we don’t need so we need to close all the open holes

TRANSMISSION:

We don’t need to worry about the internal surface but on external surface we need to close the holes and make it even

GEARBOX

Similarly, we need to do topo clean-up and close all the openings

MERGE:

After cleaning all the models, we can merge them wo create an assembly, For merge we can go to FILE-> MERGE

 

This is how the assembly looks like

 SURFACE WRAP:

We can find the wrap option in the mesh option

 

Select all PIDS and put it in right box those will get selected, as shown there are 115 items in octree scenario

It will take 10-15 min

 

Conclusions:

We learned to merge the geometry and then we created the surface wrap mesh.The surface wrap is achieved on the given powertrain components. The surface is easier to perform since it does not depend on the quality of the wrap on each material as we are not interested in physics in the body. The effective surface wrap is achieved on the given body for a given mesh length of 3mm.