Dear Jun, Did you check where these bad quality elements were located (e.g. with Tools->Mesh and select a quality range)? They might be constrained by the geometry. If you can share your geometry we can have a look.
Christophe > On 29 Aug 2018, at 21:11, Junhui Liu <[email protected]> wrote: > > Hi All, > > It appears that the quality of mesh generation depends on the version you > use. I use Mesh.Algorithm3D = 1, and Mesh.Algorithm =5. > > For example, > > if I use gmsh-3.0.3, I got > Info : Opti : (7594757,0,400672) = 1.34590E+03 QBAD 6.40230E-03 QAVG > 6.92222E-01 ( 650.191 sec) > Info : Opti : (7649463,0,408083) = 1.34590E+03 QBAD 6.40230E-03 QAVG > 6.92316E-01 ( 965.826 sec) > Info : Opti : 4 ill-shaped tets are still in the mesh > Info : Opti : 0.00 < QUAL < 0.10 : 7 elements > I > > But if I use gmsh-3.0.6, I got > Info : Opti : (7588653,0,400922) = 1.34590E+03 QBAD 1.05131E-02 QAVG > 6.92189E-01 ( 561.789 sec) > Info : Opti : (7643427,0,408262) = 1.34590E+03 QBAD 1.05131E-02 QAVG > 6.92284E-01 ( 821.088 sec) > Info : Opti : 4 ill-shaped tets are still in the mesh > Info : Opti : 0.00 < QUAL < 0.10 : 5 elements > I > > If I use the newest stable version gmsh-4.0.0, I got > Info : Opti : (5126023,0,163893) = 1.34579E+03 QBAD 6.22727E-04 QAVG > 7.99073E-01 ( 556.652 sec) > Info : Opti : (5145672,0,165902) = 1.34579E+03 QBAD 6.22727E-04 QAVG > 7.99114E-01 ( 772.064 sec) > Info : Opti : 6 ill-shaped tets are still in the mesh > Info : Opti : 0.00 < QUAL < 0.10 : 9 elements > > Although the newer version gave overall better quality, but it generated some > very bad elements. Is there a way that I can improve the quality of the mesh, > especially to eliminate the elements of poor quality? > > Thanks a lot for your help. > > Jun > > > _______________________________________________ > 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 Free software: http://gmsh.info | http://getdp.info | http://onelab.info _______________________________________________ gmsh mailing list [email protected] http://onelab.info/mailman/listinfo/gmsh
