Hello, I am solving a problem in which I use the FE_Nothing class to represent variables that do not exist in parts of the physical domain. My domain is split into two parts: In the first part, I solve for all three variables (I'll call them u1, u2, and u3) and in the second part of the domain I solve for u1 and u2 only. For my problem, I use two FESystem objects in the parameter file as follows: *FESystem[FE_Q(1)^3]* for the first part of the domain *FESystem[FE_Q(1)^2-FE_Nothing^1]* for the second part of the domain.
However, this results in the following assertion error: *An error occurred in line <2478> of file <../deal.II/src/source/fe/fe_system.cc> in function dealii::FiniteElementDomination::Domination dealii::FESystem<dim, spacedim>::compare_for_domination(const dealii::FiniteElement<dim, spacedim>&, unsigned int) const [with int dim = 2; int spacedim = 2]The violated condition was: this->n_base_elements() == fe_sys_other->n_base_elements()Additional information: You are trying to use functionality in deal.II that is currently not implemented. In many cases, this indicates that there simply didn't appear much of a need for it, or that the author of the original code did not have the time to implement a particular case. If you hit this exception, it is therefore worth the time to look into the code to find out whether you may be able to implement the missing functionality. If you do, please consider providing a patch to the deal.II development sources (see the deal.II website on how to contribute).* But when I changed the first FESystem into: *FESystem[FE_Q(1)^2-**FE_Q(1)^1**]* it worked fine because the number of base elements in both FESystems is now the same. My question is then, is this assertion necessary? Thank you, Mohamad -- 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/4799786e-eca6-4328-ab68-44b3b9db415bn%40googlegroups.com.
