![]() This interprets the two domains as sub-domains correctly, but as far as I can tell the mesh it has imported for each region are not connected to each-other, and therefore any resulting analysis will also be disconnected. It then meshes the two domains separately and outputs those to the FEATool. In short - using your commands I'm telling GMSH that my. Even in the simplest case I would expect some sort of mesh graduation due to the relative size of the universe domain to the source domain. I'm unsure how then the FEATool would model a coherent system on this disconnected mesh.įurther on this line, the GMSH optimisation procedures no-longer function on the geometry provided, I simply end up with a uniform mesh in each geometric entity because they're no longer connected. But before I can progress with this there are some concerns to address:įrom the mesh generation standpoint, I am now generating two disconnected domains which happen to overlap at some points in space. msh file can be correctly imported to the FEA Tool with two sub-domains. I have removed this command and indeed I see that the resulting. Following this method produces the type of mesh I would usually work on for FEM modelling. The GMSH physical groups option is then used to relate elements to sub-domains. STEP file to produce a mesh consisting of a single domain. Typically I would use Coherence after the merge. The two are not inter-related or connected. This would be consistent with modelling the box as one complete physical system, and the coil as another complete physical system. In my case currently I'm told I need to use a completed geometry to make a mesh if I follow this exactly (Attempt1), whilst using the intersection tool on my two sub-domains (Attempt2) allows me to form a grid, but the result only has a single sub domain which is inadequate for modelling the equations and sources (to the best of my understanding).Īgain, I'm fairly certain these are technical problems on my part, so any further advice and guidance is greatly appreciated.Īttempt1.fes Attempt2.fes Import_GMSH_Grid.fesįor the STEP file discussed (consisting of a solid block with the coil placed inside, without any intersection/hole for the coils position), the commands suggested in GMSH produces a mesh with two analytically separated regions (which just so happen to overlap physically). The aim is to form the intersection as in the example Shinkage Fitting with multiple sub-domains, whilst leaving the coil geometry as a separate subdomain where the currents exist. STEP file, whilst the last shows how importing the mesh produced in GMSH just gives me a solid box. The first two demonstrate my attempts to import the. I have attached 3 example files which I'm hoping you're able to run. I'm completely certain its an error on my part, but having followed through the examples to the best of my ability I'm not managing to get very far. I'm still having trouble importing the geometry for this simple model. New_Toy_Coil.step New_Toy_Coil.msh2 Beyond this, I also wondered whether this toolbox can consider the anisotropic form of the vector magnetostatics equation - i.e the del x (1/mu(r)) curl x A = J which would be significantly more interesting to study. msh2 file in case recreating this is required to find a solution: This is key because the internal subdomain contains all source points and I'm mostly interested in the magnetic fields in the space around the 3D coil.Įdit: I have attached an example. I saw in the documentation that multiple sub-domains are supported in 3D, I'm just unclear on the process to properly import such a geometry. STEP gives two sub-domains but I cannot progress to gridding without somehow merging the geometries: msh2 file if you prefer) works, but the internal subdomain is lost - i.e I get an empty box which prevents me from making progress:Īlternatively, importing the. The geometry of the entire system can be seen in the figure below, where the internal structure is a current carrying coil with rectangular cross section which is wholly enclosed by a box to form a black-box simulation.Ĭurrently importing grid via a. The coherence command, plus physical groups for each subdomain are used to produce a coherent mesh with a list of domain IDs to identify which elements belong to which subdomain. Specifically I'm looking at (initially) solving the vector Poisson equation for the 3D magnetic vector potential across a domain, in the presence of a 3D current source.Ĭurrently from older work I have produced a non-coherent. I'm interested in making use of the FEA Toolbox.
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