Wasim, Why do you have two different triangulations? Can you have single Triangulation and use FE_Nothing ? For example Step-70 solves two different equations on different parts of the domain using a single Triangulation.
Best, Bruno Le lun. 21 nov. 2022 à 15:27, Wasim Niyaz Munshi ce21d400 < ce21d...@smail.iitm.ac.in> a écrit : > Thank you, Prof. Bruno. > > I used the above line of code and realized where I was going wrong. When > solving the damage equation, I also call a function (let's call it H). This > function is needed to find the element stiffness matrix of the damage > equation. > This function returns some value for a given quadrature point, cell in > the damage mesh and the elasticity solution vector. But, this function H > computes that quantity by using the fe_elasticity object. > *The error, according to me, comes in this line in H function : > fe_values_elastic.reinit(cell);* > I need to *reinit *the fe_values_elasticity for each cell, but the > problem is that the *cell *I am passing as an argument lives on the > traingulation_damage while fe_values_elasticity lives on > triangulation_elasticity. > > > > On Mon, Nov 21, 2022 at 9:43 PM Bruno Turcksin <bruno.turck...@gmail.com> > wrote: > >> Wasim, >> >> Before the line that errors out can you do >> >> std::cout<<cell->get_fe().get_name()<<std::endl; >> >> and check that it matches what you have set in FEValues. >> >> Best, >> >> Bruno >> >> Le lun. 21 nov. 2022 à 11:08, Wasim Niyaz Munshi ce21d400 < >> ce21d...@smail.iitm.ac.in> a écrit : >> >>> I am working with 2 DoFHandlers. I checked my code. I am using the >>> correct DoFHandlers for the 2 equations. >>> >>> On Mon, Nov 21, 2022 at 6:58 PM Bruno Turcksin <bruno.turck...@gmail.com> >>> wrote: >>> >>>> Wasim, >>>> >>>> It's hard to say without seeing any code. Are you working with one or >>>> two DoFHandler? If you are working with two DoFHandler, are you sure that >>>> you are using the correct one? >>>> >>>> Best, >>>> >>>> Bruno >>>> >>>> On Monday, November 21, 2022 at 5:54:22 AM UTC-5 >>>> ce21...@smail.iitm.ac.in wrote: >>>> >>>>> Hello everyone. >>>>> >>>>> I am trying to solve elasticity and *laplace (damage)* equations in >>>>> the same program. The rhs of laplace equation depends on the elasticity >>>>> solution vector. Both equations have already been solved in step3 and 8. I >>>>> am following the same approach. I am creating my objects (like >>>>> triangulation_elasticity, fe_elasticity,dof_handler_elasticity) for >>>>> elasticity as in step8 and solving the elasticity equation. Everything >>>>> works fine till this point. >>>>> >>>>> >>>>> Then I tried to solve the laplace equation using the elasticity >>>>> solution. I followed step 3 approach and created the corresponding >>>>> objects(triangulation_damage, fe_damage,dof_handler_damage). >>>>> >>>>> However, I am getting the following error: >>>>> >>>>> An error occurred in line <4310> of file >>>>> </home/wasim/dealii-candi/tmp/unpack/deal.II-v9.4.0/source/fe/fe_values.cc> >>>>> in function >>>>> void dealii::FEValues<dim, spacedim>::reinit(const >>>>> dealii::TriaIterator<dealii::DoFCellAccessor<dim, spacedim, lda> >&) [with >>>>> bool level_dof_access = false; int dim = 2; int spacedim = 2] >>>>> The violated condition was: >>>>> static_cast<const FiniteElementData<dim> &>(*this->fe) == >>>>> static_cast<const FiniteElementData<dim> &>(cell->get_fe()) >>>>> Additional information: >>>>> >>>>> >>>>> * The FiniteElement you provided to FEValues and the FiniteElement >>>>> that belongs to the DoFHandler that provided the cell iterator do not >>>>> match*. >>>>> >>>>> Stacktrace: >>>>> ----------- >>>>> #0 /home/wasim/dealii-candi/deal.II-v9.4.0/lib/libdeal_II.g.so.9.4.0: >>>>> void dealii::FEValues<2, >>>>> 2>::reinit<false>(dealii::TriaIterator<dealii::DoFCellAccessor<2, 2, >>>>> false> >>>>> > const&) >>>>> #1 ./step-200: float >>>>> step200::PhaseField::H_plus<dealii::TriaActiveIterator<dealii::DoFCellAccessor<2, >>>>> 2, false> > >(dealii::Vector<double>, >>>>> dealii::TriaActiveIterator<dealii::DoFCellAccessor<2, 2, false> >, >>>>> unsigned >>>>> int) >>>>> #2 ./step-200: step200::PhaseField::assemble_system_damage() >>>>> #3 ./step-200: step200::PhaseField::damage_mesh() >>>>> #4 ./step-200: main >>>>> --------------------- >>>>> >>>>> It says that in assemble_damage, the finite element provided to >>>>> fevalues and that of dof_handler are different. >>>>> I don't know what this exactly means as I am only creating a single >>>>> object,* FE_Q<2> fe_damage* for solving my damage equation. >>>>> >>>>> Thanks and regards >>>>> Wasim >>>>> >>>> -- >>>> The deal.II project is located 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