Week 5.2 - Multi Level Meshing

                                                                     Multi Level Meshing

Aim: to improve the mesh resolution on and around the CAD objects by using the multi-level meshing technique.

Objective :

1. Without any modifications, the model results in about 700,000 elements. Note that this mesh count results from using the non-conformal meshing technique, which reduces mesh bleeding and mesh count. However, this mesh does not fully resolve the fine-level geometric features of the CAD objects. You can reduce the mesh count and improve the mesh resolution on and around the CAD objects by using the multi-level meshing technique. This procedure starts with a coarse background mesh and resolves fine level features through a series of successive mesh refinements. By using multi-level meshing and the uniform mesh parameters feature, you can reduce the mesh count to approximately 500,000 elements and improve mesh resolution. 

2. Generate the Mesh: 
   1. Create non-conformal mesh assembly
   2. Use mesh separately option with slack values
   3. Use object parameters
   4. Use set uniform parameters and use average on 1 assembly, in multi-level meshing tab allow multi-level meshing up to level 2 for the objects.
   5. Use the same technique of 1
   6. Generate mesh.
   7. Observe in mesh reduction
   8. Do visual inspection
   9. Check for quality

Generate the Mesh:

Create non-conformal mesh assembly

Use mesh separately option with slack values

3. Use object parameters

Use set uniform parameters and use average on one assembly, and allow multi-level meshing up to level 2 for the objects.

We have grouped all collective parts 

Use the same technique 

We have used the same multi-level meshing on the assemble objects and the max level on the object was set to 2 on the level scale.

Cut plane through the x-axis:

Cut plane through the y-axis:

Cut plane through the z-axis:

 Mesh surface for the domain:

Mesh reduction

Mesh reduction at the fan and heat sink assembly.

Multi-level meshing is ON and an initially level 2 is set to guide sweep.

In the next step, mesh level is increased to 3, and mesh is generated. 

Visual inspection:

Visual inspection was done for the total body there was no intersection or overlapping bodies in the total domain.

And Checking for quality is done

Face alignment:

Volume:

Skewness:

A general rule is that the maximum skewness for a triangular/tetrahedral mesh in most flows should be kept below 0.95, with an average value that is less than 0.33.

Conclusion:

The mesh count has been reduced by 2 lakhs and the generated mesh is inspected by visualizing the mesh and checking the mesh quality parameters.