Tool Test-2

Aim:-

• To perform geometry check and fix the errors.
• To Perform shell tria mesh on the surface with the required element quality criteria.
• To perform tetra volume mesh on the surface and check for quality.

Quality criteria:-

For shell tria elements-

Minimum length- 1 units

Maximum Length - 5 units.

Target Element Size- 3 units.

For tetra mesh ;-

tet collapse- 0.2 units.

CAD Model:-

Procedure:-

I. Geometry check and error fixing:-

• After importing the igs file, the file is visually observed for its corectness. Topo is performed on the model to stitch the surfaces and remove single cons.

• After this geometry check was performed. Tools-->checks-->geometry checks. All the necessary checks where activated and executed. The errors where visually checked and auto fixed.A confirmation of green tick shows the geometry is good to go for meshing operation.

II. Defeaturing the geometry:-

Before starting meshing, defeature is done on the geometry .Uncessary double cons are supressed using join and cut feature.AT bolt loaction hole areas, the distance of hole perimeter is colse to nearby fillet edge. The distnace is less than 1 unit, so elements would fail for length criteria, so the surfaces are defeatured as follows.

• Using perimeter -->length, all the surfaces where selected and a length of 3 units is specified between two perimeter points.

III Element Quality criteria Mesh parameter setup:-

To set the element quality perform, utilities-->quality & Utilities-->mesh parameters. Over here set the values of min & max length for shell and value of tet collapse for tetra elements.

Quality criteria-

Mesh parameter-

IV. Perform tria shell mesh:-

• Shell meshing can be done with various techniques such as batch mesh, free mesh, spot mesh. Each method of meshing has its own significance. For now we will choose spot mesh method .
• Now , the element to be used are othro tria elements and normal tria elements. Combination of both shall be very helpfull in achieving a good mesh flow and better detail capturing in corner areas of the model.
• So meshing the curves with ortho tria and flat surfaces with normal trias.

• At some areas there are dips, the elements are not aligned properly, so treated with align feature.

• The elements were checked for min and max length failures. There where elements failing for min length. Treated those elements with reconstruct, improve, fix quality, swap feature under topo module.

V. Perform tetra volume meshing:-

• Starting with volme meshing , the geometry need to be defined as closed. volume mesh is possible only if the model is closed or is deted as volume. To do this , volume mesh module-->list. Confirm for any volume. If none volume is there then, Volume-->define-->auto. This will auto detect the geometry.
• Now the volume is detected but is undefined. So, right click -->edit. This will open a dialoague box asking for mesh parameters. Choose mesh method according to your conveinence. Here choosed tetra FEM.

• Now the volume is defined but the status is still unmeshed. Right click-->remesh. All the shell elements will be remeshed to volume mesh.

• As the 3D elements elemnts are generated, property card is also created for the elements with card img as PSOLID.

• Now, checked the elements for any kniks, raised elements, mesh flow, tet collapse failing elements.There were no failed elements in our case for tet collapse.Using bounds view, the elements where checked cross sectionally.

• The Intake manifold is ready with tetra elements.

Learning Outcome:-

With this project, learned to perform geometry checks and fix the errors . Perform tria shell meshing and get good quality elements and proper mesh flow using different element types. Perrform tetra volume mesh on the model.

Conclusion:-

From this project, we can conclude that geometry cleanup must be done properly so that the elements generated would be of good quality and better mesh flow. Check the geometry for raised and dip elements once shell meshing is done.