Hello,
I would like to build a volume mesh of this geometry, but I am having compatibility issues.
Do you have any solutions to offer me?
Thank you in advance.
Attached is the .SPT
Noeud29.stp (9,1 Mo)
file.
hello,
there are some issues with your geometry, i dont know from where you are exporting it,
first of all, you need to explode it into compound and only mesh compound_1 of the resulting entities (it looks like, in the original software you exported also some curves?) in any case this objects will interfere the meshing process.
sencondly, it looks like the object was created from a quadrangle mesh? but at the same time divided into different solids?
maybe fuse everything together before exporting it? if i may, what is the software where you are creating it?
any case, the geometry has a LOT of edges (as if it was already pre meshed), salome will ‘force’ the mesh to go thought this edges so you are going to finish with a quite ‘ugly’ mesh.
you will get something like this with netgen (i have only did 2D)
as you can see you will get ‘hotspots’ on the surface as there are some really small edges. I think already if you arrive to merge them together before exporting to step, you will not have this issue.
nevertheless, the current geometry, doing a volumetric mesh, will take too much time as you are generating really small surface elements.
Hello,
The starting software is Rhino. The geometry is generated automatically by an algorithm developed on Grasshopper.
The idea is to have several parts of the node and then apply a different property to each of them.
By merging the solids to obtain a single volume, I am unable to recover the different parts ?
I should had realize that was a grasshopper object, that thing is f powerfull. awsome tool.
in that case, no you need to have separate solids for each porperty, if not the division between each of then will not be clear.
what I would test if i am you:
you have a boundary edges between each solid, in rhino, i would recreate the faces over that edge again, as you can notice in the first image i posted of your geometry, you have a nice quadrangle mesh that has been cut over to make each node, and to salome you are bringing the edges of the ‘quad mesh’ used in grasshoper AND the edges of the cutting sections overlapped. the overlapping of them create really small edges and this you will pay it extremelly in the volumetric meshing. if you instead, replace the surface by using the edges of the cut geometry, the quad mesh will be nice and clean ‘inside’ each solid, and not nice and clean before the cutting operation. this will eliminate the majority of the small edges (not all of them) and you will be able to get a way better mesh in salome.
also, i would check if you are simply not exporting correctly in rhino. I understand that this ‘quad mesh’ that is showing is somewhat the iso lines of the geometry, that rhino used to create the surface, maybe you are missing a step (something like ‘smooth out the surface’) or you are exporting to mach data inside the file (you had already extra curves so i tent to say that this might be the culprid) but getting a smooth surface with way less edges would help you out in the meshing process.
in any case, your currently geometry is fully meshable, simply it will have awfully small elements that for any kind of simulation that you do will explode the time of resolution/ the solver will crash/ you will wait a hole day to get 3D netgen to finish.