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<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;">Prof.
Geuzaine:</span></span><br>
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<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><br>
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<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;">You
are right, my *.stp file is exported by PTC Creo from a 3D assembly. It does contain several parts which are not topologically connected.</span></span></div>
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<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><br>
</span></span></div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;">I
first tried adding "<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;">Coherence"
statement but it didn't work. Moreover, the "loading script" operation was as fast as before, I think this indicates that "<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;">Coherence</span></span>"
operation wasn't actually performed.</span></span></span></span></div>
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<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><br>
</span></span></span></span></div>
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<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;">Fortunately,
the "<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;">BooleanFragments"
operation perfectly worked as intended. The resulting mesh is just what I want.</span></span></span></span></span></span></div>
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<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><br>
</span></span></span></span></div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;">Thank
you very much for your advice.</span></span><br>
</span></span></span></span></div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><br>
</span></span></span></span></span></span></div>
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<span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;"><span><span style="color: rgb(51, 51, 51); font-family: "Segoe UI WestEuropean", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", EmojiFont, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400;">Best
regards</span></span></span></span></span></span></div>
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<div class="PlainText">> On 3 Nov 2017, at 13:23, Wesley Ranger <metorm@outlook.com> wrote:<br>
> <br>
> Hi guys<br>
> <br>
> I am having trouble meshing a geometry composed of 3 kinds of materials. Let's call them material A, B and C.<br>
> <br>
> The 3 material in the geometry has 2 interfaces. I defined several physical surfaces and 3 physical domains.<br>
> <br>
> Weird things happened then. In the resulting mesh, the vertices on A/B interface are well aligned, i.e. each vertex on A/B interface and belongs to A mesh has an identical copy in B mesh. They have the same coordinates, so I can connect them in solving stage.<br>
> <br>
> However, the vertices on B/C are not well aligned. A vertex belongs to C mesh may be located in the middle of a facet which belongs to B mesh.<br>
> <br>
> It is hard to describe using words, so I posted a question here:<br>
> <br>
> <a href="https://stackoverflow.com/questions/47095493/any-way-to-make-gmsh-to-use-the-same-vertex-set-on-both-sides-of-a-material-boun">
https://stackoverflow.com/questions/47095493/any-way-to-make-gmsh-to-use-the-same-vertex-set-on-both-sides-of-a-material-boun</a><br>
> <br>
> Any way to make gmsh to use the same vertex set on both sides of a material boundary?<br>
<br>
Your step file probably contains volumes that are topologically not connected, i.e. there are 2 surfaces (at the same location) for each internal boundary. Gmsh then creates 2 independent surface meshes, one for each surface. If you remove the duplicates, Gmsh
will generate a single surface mesh for each interface, and your volume mesh will be conformal.<br>
<br>
You can use the new CAD features in Gmsh to remove these duplicate internal surfaces. With the stable release, you can do<br>
<br>
SetFactory("OpenCASCADE");<br>
v() = ShapeFromFile("file.step");<br>
BooleanFragments{ Volume{v()}; Delete; }{}<br>
<br>
With the latest development snapshots, you can use the "Coherence" shortcut (which does exactly the same thing):<br>
<br>
SetFactory("OpenCASCADE");<br>
Merge "file.step";<br>
Coherence;<br>
<br>
Christophe<br>
<br>
PS : Physical definitions have no influence on mesh generation - they are just a way to group/name entities for exporting.<br>
<br>
<br>
<br>
<br>
> I am trying to mesh a complex geometry composed of 3 kinds of materials, like below: The geometry is imported from a *.stp file. I defined several physical surfaces and 3 physical domains in the ...<br>
> stackoverflow.com<br>
> Anyone, please give me some suggestions to handle this. Thank you!<br>
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<br>
<br>
-- <br>
Prof. Christophe Geuzaine<br>
University of Liege, Electrical Engineering and Computer Science <br>
<a href="http://www.montefiore.ulg.ac.be/~geuzaine">http://www.montefiore.ulg.ac.be/~geuzaine</a><br>
<br>
Free software: <a href="http://gmsh.info">http://gmsh.info</a> | <a href="http://getdp.info">
http://getdp.info</a> | <a href="http://onelab.info">http://onelab.info</a><br>
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