Dear Prof. Geuzaine, Thanks so much for your reply! I tried to use "fragment". And it does work, now the results look reasonable: [image: image.png]
The multiple bodies have remained as well: [image: image.png] Thanks very much! Best regards, Hao ------------------------------- Kyoto University Department of Mechanical Engineering Christophe Geuzaine <[email protected]> 于2019年11月12日周二 下午9:39写道： > > > > On 12 Nov 2019, at 13:14, 李昊 <[email protected]> wrote: > > > > Dear all, > > > > I use Solidworks to sketch a 3D part as shown below. In this model, > there are 9 volumes. > > <image.png> > > Then I export ".step" and import into the gmsh. > > > > Then I use Gmsh to generate 3D mesh as below: > > <image.png> > > Till now, everything looks good. > > > > After that, I export ".mesh" to FreeFem for numerical simulation. Now > something strange happens: > > I apply a force on the left side wall, and make the right side wall to > be fixed. > > However, both rings does not have any displacement. That means the rings > do not take part in the computation. > > <image.png> > > > > Next, I used Boolean operation in Gmsh to merge all the nine volumes to > be a single volume > > <image.png> > > This time, the result seems reasonable: > > <image.png> > > > > > > Please note that we hope to maintain the multiple bodies rather than a > single body. Because we need to apply different physical properties for > each domain. > > Therefore, is there any way to create a single mesh with multiple bodies? > > > > Yes, use BooleanFragments instead of BooleanUnion: it will preserve the > internal boundaries. > > Christophe > > > > > The CAD model "auto_part_2.STEP" is attached. > > Both meshes are uploaded as well. The multiple volume one is named as > "auto_part_2.mesh". The single volume one is names as "auto_part_2_1.mesh". > > > > Please kindly check them. > > > > Thanks very much! > > > > > > Best regards, > > Hao > > > > > <auto_part_2.STEP><auto_part_2_1.mesh><auto_part_2.mesh>_______________________________________________ > > gmsh mailing list > > [email protected] > > http://onelab.info/mailman/listinfo/gmsh > > — > Prof. Christophe Geuzaine > University of Liege, Electrical Engineering and Computer Science > http://www.montefiore.ulg.ac.be/~geuzaine > > > >
_______________________________________________ gmsh mailing list [email protected] http://onelab.info/mailman/listinfo/gmsh
