Creating finer mesh at center and outer coarse mesh in a solid box 2

[abaqusian]

Dear all,

I am currently working in LS DYNA to do an impact simulation. Physically it's like droplet impingement on a solid plate. I do not know how to create a solid box with finer mesh at the centre of droplet impact and in other areas of solid box, a coarse mesh. I want to create this simple model along with mesh in Ansys and then import into LS-DYNA to do further work. I have attached a reference model (a jpeg file along with this post) , which was taken from one of the literature.

Can anyone suggest any reference/tutorial ? Thank you very much

 

[Stanum]

If I understood you correctly, then you should probably use xRefine command. See 8.1. Refining a Mesh Locally in ansys manual Modeling and meshing guide.

 

[abaqusian]

@ Stanum : Thanks for the reply. I will check the reference.

 

[assafwei]

Hi abaqusian,

In the image that you attched it seems that the following was done:

The Big cube was split into a number of smaller cubes,then the small cubes were grouped together using "form part" (picking all the small cubes, right click and select "form part") then the middle cube was assigned with a fine mesh size and the others with a coarse mesh size (or just left with the genral mesh size). It is important to understand that if you would like to keep the mesh a HEX mesh you need to consider the meshing order, i.e - first mesh the inner cube with the small sized mesh and then proceed to the other outside cubes (pick the middle cube, right click and pick "generate mesh on selected" and so on).
It might take you some trial and error to figure out the correct order of meshing in order for the mesher to be able to hex mesh but you will get the idea quickly. The main idea is that the mesh needs to be continuous to be HEX meshed.

PS - if you dont assign a sweep or multizone pure hex mesh method to each of the small cubes, ANSYS will try to automatically mesh the cubes and then it will probobly TET mesh tehm so dont forget this step.

 

[abaqusian]

Hi Assafwei,
It was a great reply. Thankyou very much. Do you see any possible tutorial for the steps you have mentioned? I know it cannot be exactly same steps but any similar tutorial, could you recommend me? thanks again

 

[assafwei]

Hi,

I dont recall any particular tutorial, but if you are looking for tutorials, I would start with the "meshing introduction" I am pretty sure there is at least one tutorial with hex meshing using partitioning and sweep/multi zone meshing.

 

[abaqusian]

Assafwei, thanks for the input. I refer them.