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Remesh certain parts of the surface mesh with a bigger element size

I have attached a picture of my model.

I need to remesh most parts of the model with larger element size while preserving the smaller element size where the pits are.I know one technique is to make separate components, use coarsen mesh and then use ruled to combine those components. But this process would take a lot of time. Is there any way to achieve this without dividing the component.

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QuyNguyenDai

You have to split your surfaces, not component. When you have several surfaces (sub-domain) you can make the mesh with different density.

Altair Forum User

The problem is that I don't have any geometry but only the mesh.

But even I had surfaces, if I don't understand wrong, I would then have to combine them after meshing by joining all the nodes manually because the different surfaces won't have the nodes matching on the edges. Also what option would I be using to mesh the surfaces because automesh doesn't work on surfaces with free edges.

QuyNguyenDai

Splitted surfaces have always shared edges. So the mesh will be connected correctly on shared edges.

Altair Forum User

You can get the geometry file from 'Extract From FE ' option. Kindly check with Surface Complexity Option while working.

Geometry > Surfaces > Extract From FE

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You can delete respective mesh by keeping your area of interest & remesh the respective surfaces with coarse size. Finally, you can equivalence them, in which it will connect all the nodes which are apart with some distance ( Using proper tolerance value )