Uploaded on
04 Oct 2022
Skill-Lync
Hexa element is a 3D representation of a quad element which will have the thickness measurement that the quad won’t have in reality.
Below are the two methods to generate Hexa Mesh in ANSA:
Now, we will see how to generate the Hexa mesh by using the volume mesh deck. The Hexa block method is when we convert our geometry to small cuboids, following which ANSA will use those boxes for generating the mesh.
The common restrictions are as follows:
Step - 1: Import the geometry.
Step - 2: You have to check the geometry before moving to the mesh to check whether it has any features or not. For our case, we have 4 elliptical features. So we need to project the outer lines of the feature to the bottom surface. We are doing the projection of cons for making proper node connectivity between the base plate and feature.
Step - 3: We need to perform 2D mesh on the base surface and work on the mesh flow. While doing the Hexa mesh, we have to avoid as much tria as we can. Because the tria element will form the Penta element that is not recommended in the structural simulation. You can keep the rotating quad also.
Step - 4: There are so many tools available in ANSA for converting the 2D element to hexa but in this case, the extrude option is Sufficient. (Volume mesh>structured mesh>extrude)
Note: If you are unchecking the box that we had marked in the image, you can control the element or step size of the Hexa element. If you check the option, the element size calculator will measure the length of the selected perimeter/average length.
Reason for projecting the cons :
Hexa mesh done by projecting the feature cons on bases surface
Hexa mesh done without projecting the feature cons on bases surface
If we are not projecting the cons, the node connectivity goes missing as we can see it in the above image. Here you may ask a question, what is the need of the node connectivity. If it is not there, the force transmission from base plate to feature will not happen so we will end up with the wrong result. This is the one of the major reasons why the hexa mesh is very difficult to execute.
Author
Navin Baskar
Author
Skill-Lync
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