Both idea work fine now. Thank you so much! 在 2018年3月29日星期四 UTC-7上午11:31:23，Jean-Paul Pelteret写道： > > Hi Weixiong, > > So, have you looked at the FAQ as the error message suggests? There’s also > actually a discussion on this point in the very first tutorial. Here’s the > relevant snippet for you: > > At this point, all objects created in this function will be destroyed in > reverse order. Unfortunately, we defined the manifold object after the > triangulation, which still has a pointer to it and the library will produce > an error if the manifold object is destroyed before the triangulation. We > therefore have to release it, which can be done as follows. Note that this > sets the manifold object used for part "0" of the domain back to a default > object, over which the triangulation has full control. > triangulation.set_manifold > <https://www.dealii.org/developer/doxygen/deal.II/group__manifold.html#ga9f9d720f5fbdcdf3dcbb445feefbdb9f> > > (0); > > An alternative to doing so, and one that is frequently more convenient, > would have been to declare the manifold object before the triangulation > object. In that case, the triangulation would have let lose of the manifold > object upon its destruction, and everything would have been fine. > > Best, > Jean-Paul > > > On 29 Mar 2018, at 08:14, Weixiong Zheng <zwxn...@gmail.com <javascript:>> > wrote: > > Hi > > It does give me straight boundary after changing to: > > const Point<2> center (0,0); > const SphericalManifold<2> boundary_description(center); > //const StraightBoundary<2> boundary_description; > //tria.set_all_manifold_ids_on_boundary(0); > tria.set_manifold (2, boundary_description); > > for (typename Triangulation<2>::active_cell_iterator > cell=tria.begin_active(); cell!=tria.end(); ++cell) { > for (int fn=0; fn<4; ++fn) { > auto ctr = cell->face(fn)->center(); > auto x=ctr[0],y=ctr[1]; > if (0.92<std::sqrt(x*x+y*y) && std::sqrt(x*x+y*y)<1. && !cell-> > at_boundary()){ > cell->set_all_manifold_ids(2); > break; > } > //if (cell->at_boundary()) > //cell->set_all_manifold_ids(2); > } > } > > But after the program finished, I got the following message for errors: > > An error occurred in line <128> of file > </Applications/deal.II-8.5-brew.app/Contents/Resources/brew/src/deal.II-8.5-brew/source/base/ > subscriptor.cc> in function > void dealii::Subscriptor::check_no_subscribers() const > The violated condition was: > counter == 0 > Additional information: > Object of class N6dealii17SphericalManifoldILi2ELi2EEE is still used > by 1 other objects. > > (Additional information: <none>) > > See the entry in the Frequently Asked Questions of deal.II (linked to from > http://www.dealii.org/) for a lot more information on what this error > means and how to fix programs in which it happens. > > Stacktrace: > ----------- > #0 2 libdeal_II.g.8.5.0.dylib 0x000000011e04707c > _ZNK6dealii11Subscriptor20check_no_subscribersEv + 3660: 2 > libdeal_II.g.8.5.0.dylib 0x000000011e04707c > _ZNK6dealii11Subscriptor20check_no_subscribersEv > #1 3 libdeal_II.g.8.5.0.dylib 0x000000011e047292 > _ZN6dealii11SubscriptorD2Ev + 34: 3 libdeal_II.g.8.5.0.dylib > 0x000000011e047292 > _ZN6dealii11SubscriptorD2Ev > #2 4 libdeal_II.g.8.5.0.dylib 0x000000011e9c96c5 > _ZN6dealii8ManifoldILi2ELi2EED2Ev + 21: 4 libdeal_II.g.8.5.0.dylib > 0x000000011e9c96c5 _ZN6dealii8ManifoldILi2ELi2EED2Ev > #3 5 step-49 0x000000010d18f0c5 > _ZN6dealii17SphericalManifoldILi2ELi2EED2Ev + 21: 5 step-49 > 0x000000010d18f0c5 > _ZN6dealii17SphericalManifoldILi2ELi2EED2Ev > #4 6 step-49 0x000000010d18eaf5 > _ZN6dealii17SphericalManifoldILi2ELi2EED1Ev + 21: 6 step-49 > 0x000000010d18eaf5 > _ZN6dealii17SphericalManifoldILi2ELi2EED1Ev > #5 7 step-49 0x000000010d18d663 _Z6grid_2v > + 1891: 7 step-49 0x000000010d18d663 > _Z6grid_2v > #6 8 step-49 0x000000010d18eb09 main + 9: 8 > step-49 0x000000010d18eb09 main > #7 9 libdyld.dylib 0x00007fffe1c02255 start + 1: > 9 libdyld.dylib 0x00007fffe1c02255 start > -------------------------------------------------------- > > make[3]: *** [CMakeFiles/run] Abort trap: 6 > make[2]: *** [CMakeFiles/run.dir/all] Error 2 > make[1]: *** [CMakeFiles/run.dir/rule] Error 2 > make: *** [run] Error 2 > > 在 2018年3月28日星期三 UTC-7下午10:42:30，Jean-Paul Pelteret写道： >> >> Hi Weixiong, >> >> The issue that you’re seeing here is actually related to a discussion >> that we’re currently having regarding the behaviour of boundaries and >> manifolds (and will hopefully be fixed soon in the developer version). >> You’re hitting the issue discussed here >> https://github.com/dealii/dealii/issues/5931 >> and we’re working through a fix for it here >> https://github.com/dealii/dealii/pull/5932 >> >> The simple solution is to use a manifold ID that does not coincide with a >> boundary ID. Since your triangulation is not colourised, all of your >> boundaries will have an indicator of 0. So try to use a manifold ID of, >> say, 1. I think that this should fix the issue for you. >> >> I hope this helps. >> >> Best, >> Jean-Paul >> >> On 29 Mar 2018, at 07:13, Weixiong Zheng <zwxn...@gmail.com> wrote: >> >> I changed the strategy that I don't assign manifold first. I merge two >> triangulations. Then, I loop over cells to see if cell has a side on the >> merged interior boundary. If so, I set manifold id to it. >> >> >> const Point<2> center (0,0); >> >> const SphericalManifold<2> boundary_description(center); >> tria.set_manifold (0, boundary_description); >> for (typename Triangulation<2>::active_cell_iterator >> cell=tria.begin_active(); cell!=tria.end(); ++cell) { >> for (int fn=0; fn<4; ++fn) { >> auto ctr = cell->face(fn)->center(); >> auto x=ctr[0],y=ctr[1]; >> if (0.92<std::sqrt(x*x+y*y)<1.) { >> cell->set_all_manifold_ids(0); >> break; >> } >> } >> } >> tria.refine_global(2); >> The result is super strange that the boundary is also exterior boundary >> is also curved. >> >> 在 2018年3月28日星期三 UTC-7下午9:00:50，Weixiong Zheng写道： >>> >>> Hi, >>> >>> I just started to try manifold and tria merging functionalities. My >>> question comes from the problem that I have to merge two curved >>> triangulations. When refining, how do I make sure the merged boundaries are >>> still curved? >>> >>> I currently set manifold before merging triangulation but it seems not >>> to work as desired. >>> >>> See the attachment pls. >>> >>> Thanks for any advice in advance. >>> Weixiong >>> >> >> -- >> The deal.II project is located at http://www.dealii.org/ >> For mailing list/forum options, see >> https://groups.google.com/d/forum/dealii?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "deal.II User Group" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to dealii+un...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. >> <Screenshot 2018-03-28 22.08.32.png> >> >> >> > -- > The deal.II project is located at http://www.dealii.org/ > For mailing list/forum options, see > https://groups.google.com/d/forum/dealii?hl=en > --- > You received this message because you are subscribed to the Google Groups > "deal.II User Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to dealii+un...@googlegroups.com <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > >
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