Dear Prof. Wolfgang, Thank you very much for the suggestions. To have a quick solution, I am opting the first suggestion i.e. to make particles on quadrature points and assigning them the tensor quantities. And if I gain some reasonable results specific to my project then I might also want to add it as a permanent feature in my code by spending more time to implement the second suggested solution of elegant way. So I have updated my version from 9.1.1 to 9.2.0 and started writing the code for particles.
My original code is similar as step-42 but first I am using step-42 to fulfill at least the task of creating particles on quadrature point locations. I have declared the concerned variables: * Particles::ParticleHandler<dim> particle_handler; types::particle_index next_unused_particle_id;* * MappingQ<dim> mapping;* and then added the following syntax during construction of class ( *PlasticityContactProblem<dim>::PlasticityContactProblem*) (after line 833): * , mapping(1) , particle_handler(triangulation, mapping, /*n_properties=*/dim) , next_unused_particle_id(0)* When I run the step-42 then it returns following error: *.~/working_dir/step-42$ /step-42 p1_chinese.prmSegmentation fault (core dumped)* I tried to comment out the line " , particle_handler(triangulation, mapping, /*n_properties=*/dim) " and by doing so the code starts running normally. I have tried to run it in the debug mode but over there the program exits with following error: *(gdb) rStarting program: ~/working_dir/step-42/step-42 [Thread debugging using libthread_db enabled]Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".*** Call this program as <./step-42 input.prm>[Inferior 1 (process 5082) exited with code 01]* Can there be a possible problem in using the " *particle_handler(triangulation, mapping, /*n_properties=*/dim) *" ? Thank you! On Friday, July 17, 2020 at 1:35:53 AM UTC+2 Wolfgang Bangerth wrote: > On 7/16/20 9:15 AM, Muhammad Mashhood wrote: > > So far it would be enough if I have the Gauss point values only at the > points > > rather than having complete field. I like to access these point values > of > > stress and strain tensors in .vtk file or .pvtu file through ParaView > (same as > > I am accessing the results currently). > > I would be grateful if you or any other user has experience in this > regard or > > know about relevant deal.ii tutorial dealing with same feature. > > deal.II has functionality to output data on individual points if that data > is > associated with particles. I don't know how much work you want to invest > in > getting this to work for you, but here are two options: > > * Easy: Create a ParticleHandler object, loop over all of your quadrature > points, and for each quadrature point you create a particle. You can then > associate "properties" with each particle, and use Particles::DataOut to > output these properties in the same way as you would use DataOut for field > data. You can probably figure out how this works by looking at the draft > step-19 tutorial program: > https://github.com/dealii/dealii/pull/10301 > > * More work, but more elegant: You could write a class, let's say > QuadraturePointData::DataOut or something similar, to which you could > describe > the information of location + values without the detour of particles. I'm > sure > we'd be happy to walk you through the process of doing so if you wanted to > go > for that, and it would be a very nice addition to deal.II if you wanted to > get > it merged. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bang...@colostate.edu > www: http://www.math.colostate.edu/~bangerth/ > > -- 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+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/d3dbe6ca-cf2a-4126-95d7-4a36001e4430n%40googlegroups.com.