Week- 5 - Solid meshing

AIM:

     To perform a 3D unstructured mesh on the given rear view mirror in ANSA.

OBJECTIVE:

     1.To check for the geometrical errors and mesh the Surfaces with the given 2D element.

     2.To mesh the Volumes defined in the model and check for the below quality after Volume meshing.

PROCEDURE:

1.IMPORTING THE MODEL:

1.Import the file in ANSA workspace.

     

2.The first operation is to perform the topology on the model.

3.FACES > TOPO select all the cons in the geometry.

     

2.GEOMETRY CHECK:

1.To check for the faces and missing faces we run the geometry check on the given model.

     

2.Fix the error by right click and select Fix if auto fix fails to solve the error fix the model manually by deleting the extra faces or toggling the cons.

     

3.QUALITY CRITERIA:

1.Assiging the Mesh Parameters and Quality for the given model.

     

                   

4.TOPOLOGY CLEANUP:

1.The geometry is fixed the topology of the model needs to be fixed based on the minimum element length, cons which are not satisfying the minimum length criteria needs to be joined to avoid the mesh quality.

2.The geometry is ready to meshed when the topology is cleaned.

5.SHELL MESHING:

1.To capture the curved surfaces without any dips ortho tria mesh is used on curved faces.

2.Ortho Tria captures the curved faces more accurately then the normal trias.

     

     

6.VOLUME MESHING:

1.Goto Modules > Volume Mesh > Define > Manually and select the part.

2.Volume is created which can be viewed and edited in list option.

3.Now then created a volume need to be meshed with tetrahedral elements.

4.Select the tetra rapid or tetra FEM to generate the volume mesh inside the shell mesh.

5.Goto Modules > Volume Mesh > Unstructured Mesh > Tetra Rapid / Tetra FEM and select the volumes.

6.If the volume mesh has any off elements they have to be fixed to pass the tet collapse criteria and minimum and maximum element length.

7.If any off elements they can be automaticaly fixed by selecting the failed elements and selecting the fix quality.

8.Goto Modules > Improve > Fix Quality > Select.

     

9.Other method to fix the quality is by reconstruction the improve tab. If these two option fail to fix the quality manual fix should be carried out, care should be taken when mocing the nodes.

OUTPUT:

     

OBSERVATION:

1.Thus the quality criteria for solid unstructured mesh and techniques to fix the failed elements.

2.Thus the practice on volume meshing module in ANSA preprocessor.

RESULT:

     Thus the rear view mirror is meshed with solid tetraelements and checked for the quality criteria to pass the given quality criteria.