Week 8-3D Tetra Meshing Challenge

Housing Model:

Objective:

To create a tetramesh for housing component by using Tetramesh generation method by converting the model from 2D to 3D with mentioned criteria.

CAD Model Image:

Procedure:

• Firstly import the Geometry(IGES) file from the System files.
• After importing the model 'Delete' the solid parts of the component.
• Defeature the surface fillets which are having low fillet radius that may result in failure of elements.
• Perform the Geometry cleanup wherever it is required to get rid of failed elements.
• Go to 2D mesh panel>Automesh,select the preferred element size as 4mm.
• Select the 'Tria' elements as we have to generate a tetramesh.
• Generate the mesh with the mentioned criteria.
• After meshing check the elements for quality checkup in Tools>Check elements panel>2D.
• Do the quality checkup for the minimum and maximum lengths.

• After quality checkup is done,convert the model from 2D tria elements to 3D tetra elements.
• Then Go to 3D mesh>Tetra mesh and select the elements option that has to be converted from 2D tria to 3D tetra.
• Generate the 3D tetramesh of the component.

• After that 3D tetra meshing check the elements for quality checkup in Tools>check elements >3D for Tet collapse.
• Do the quality check for the tet-collapse elements.
• And then for the failed tet-collapse elements we have to do tetra-remesh by assigning the tetra mesh parameters in the 'Tetramesh' parameters panel.
• By performing Tetra-remesh we can get rid of the failed tet-collapse elements.
• For tetra-remesh go the Tools>tetramesh>Tetramesh parameters.
• After that assign the max-tetra and min-tetra size by checking the check-box in 'Tetra-mesh parameter' panel.
• Under 'Element quality target' assign the tet-collapse value and tick the check-boxs of fill-voids,fix mid-nodes and smoothing.

Result:

For the given housing component Tetra mesh is generated by converting 2D tria elements to 3D tetra elements,The Final model image is as follows.

Final Model Image:

Model-2:

Objective:

To create a 3D Tetra mesh by using 'Quick Tetra mesh method for the given component with the mentioned quality criteria.

CAD Model Image:

Procedure:

• Firstly import the IGES model from the system files.
• After importing the model delete the solid parts of the component.
• Defeature the surface fillets which are having low fillet radius which may result in element failures.
• perform the geometry cleanup wherever it is required.
• For meshing the model using the 'Quick Tetra mesh method we have to go to the Utility panel.
• For Utility panel use view option view>Browsers>Hypermesh>utility.
• After that select Geom/Mesh from 'Utility Menu'.
• Then select Quick Tetra mesh as it opens a panel named as 'Quick Tetar panel'.
• In that panel select the component to be meshed and specify the mesh size,minimum element size and change the mesh type to 'Trias only'.
• Click on the 'Mesh' option to generate the tetra mesh.
• After generating the tetramesh we need to check for the Failed tet-collapse elements.

• For checking the failed elements select Tools>check elements>3D>tet collapse.
• For clearing the Tet-collapse elements we have to try to remesh the failed elements.
• If the failed tet-collapse elements still exists we have to follow other method as 'Translate' command in Tools option.
• To clear tet-collapse select Tools>translate option.
• Pick a node of the failed element which has minimum height.
• Select other nodes as N1,N2 & N3 for the translation.
• Assign the magnitude for Translating the node.
• After correction of the Failed elements check the tet-collapse value in 'Check elements' option.

Result:

For the given model tetra mesh is generated by using 'Quick Tetra mesh method' with the mentioned criteria,The final model image is as follows.

Final Model Image:

Model-3:

Objective:

To create a 3D tetramesh by using 'Volume tetra method' for the given component with mentioned quality criteria.

CAD Model Image:

Procedure:

• Firstly import the IGES model from the system files.
• For volume tetra mesh method we can mesh it without deleting the solid component of the model.
• After importing the model into the hypermesh cleanup the geometry.
• After that keep the solid of the model and then select 3D>tetramesh and then click on the Volume tetra option by selecting the solid of the model.
• Check the checkboxes 'Use curvature' and 'Use proximity'.
• And after that,specify the minimum element size and select the checkbox of 'Cleanup elements'.
• Then click on the 'Mesh' to generate the volume tetramesh.
• After generating the volume tetramesh check for the failed tet-collapse elements.

The Volume Generated tetra mesh components are as follows:

• For checking the failed elements select Tools>check elements.
• Then after to get rid of the Tet-collapse failed elements use Tetra re-mesh method (or) 'Translate' command option.
• For tetramesh Select Tools>tetramesh>tetramesh parameters.
• Then after assign the Max tetra and Min tetra size by checking the checkbox in tetramesh parameters panel.
• Under element quality target assign the tet-collpase value and tick the checkbox Fill voids,Fix mid-node and smoothing.
• And there is another way of getting rid of tet-collapse failed elements.
• To clear tet-collapse select Tools>Translate option.
• Pick a node of the failed element which has minimum height.
• Select the nodes N1,N2 & N3 for translation.
• Assign the magnitude for translating the nodes.
• Do the translate process for all the failed elements until it reaches the failure elements to zero.

Result:

For the given model Tetra mesh is generated by using 'Volume Tetra mesh method' with the mentioned criteria,The final model image is as follows.

Final Model Image: