Week 8-3D Tetra Meshing Challenge

AIM: Create a Teramesh for Housing component with the following quality criteria.
objective(1) :TetraMesh Generation Method: 2D to 3D Conversion

Elements sizes: Min- 2 Units, Target- 5 Units, Max- 7 Units

Tet collapse: 0.15

Housing Model
Procedure:
* the given model is in .stp format hence we need to import using import>geom>.stp>import. the below image shows the procedure.
* Deleting solids: Once the model is imported we will delete the solids in the mmodel .
* Geometry cleanup and defeaturing: we will check model for any free surface by viewing the model in wireframe mode.
The fre surface had no free surface, hence we can proceed with defeaturing , here we will remove the lines where minimum thickness error may occur.however, few area could not be defeatured as feature capturing was getting affected.
* 2D Meshing: As per the requirement we have to convert 2d mesh to 3d. we need to first set the utility criteria.
Once the quality criteria is set we can proced with meshing. to do we will go to 2D>automesh>surf. once the mesh is created it is important to clear all off elements from the mesh, as it may cause tet collapse in the final mesh.
The mesh initially gave many off elements, most of which can be removed by smothing the mesh however, at few areas maximum length can be resolved by inducing two row of elements. this also helps is capturing the feature . minium length errors on few regions could be fixd by moving the node.Once the off elements are cleared we check for errors like connectivity issue, duplicates and equivalence errors. if found we will fix them.
* Converting 2D to 3D: As per requirement we will convert the generated 2d mesh into 3d mesh. In order to do so we will go to 3d>tetramesh>tetramesh>elements.
once tetramesh is created we will check for quality issues. in the given model Tet collapse is of most importance,hence we will check it by going to Tools>check elements>3d>tet collapse. As we had resolve all the off elements in 2d mesh there was no tet collapse issue in the 3d mesh.
Objective 2: For given model, create a 3d tetramesh with following quality criteria.
Quality criteria: Target Elements size:3 units. tet collapse:0.15
Tetramesh Generation Method: Quick Tetramesh/ Volume Tetra mesh.
Procedure: For doing quick tetramesh it is important to make sure that the model is closed completely.Hence we look for any free dges in the model.
* Meshing: In order to mesh the given model in with tetra elements we will use quick tetrameshing, this method is comparatively very less time consuming. in order to mesh we will go to view>browser>geom/mesh>quick tetramesh.
we can select the component and surface. we can mesh size which is our target element length and proceed. this method first creates 2d mesh and using it tetra mesh is created.The 2d mesh can be deleted after tetramesh is created.
* Element cleanup: Once elements are we will check for tet collapse, to check we will go to Tool>Element check>3d>Element check> tet collapse. in order to resolve the fail tet collapse elements we will go to tetramesh tool> mesh parameters>Enter element quality target> tet collapse(0.15).Now, go to Tetra remesh> Elements> Displayed>confirm. after this we will again check for tet collapse, this ,method resolve all tet collapse.
Objective 3: Taarget Element size: 4 units. tet collapse:0.15
Tetramesh generation method: Quick tetramesh/volume tetramesh
Procedure:
Import: the given model is in .HM format, we imported the model uing import tool>model.
*Geometry check and defeaturing: Once the model is imported we will view the model in wireframe view to check any issues. the model did not have any geometry issue.
Once done we can isolate the components one by one to check and defeature whereever required. in the given we defeatured the surface where length issue could occur.
* Meshing: In the given we have used volume mesh method, in order to use this we have to make geometry is closed. we will go to 3d>tetramesh>volume mesh. isolate each component and mesh one by one.
Once the meshing is done we will check for tet collapse in the meshing.the off elements were removed using similar method as used in model 2. we set the tetramesh parameters and remeshed the elements.which resolved the issues.
* Conclusion: hereby, we have meshed all the models with 3d tetramesh using different method with given quality criteria. by doing this challenge we got to learn about tetra meshing and different methods through which it can be achieved.