> I have coupled two problems 2D Navier-Stokes and 1D evolution equation > on boundary of 2D. Assembling and solving of 2D problem is OK, problem > is when i try to call function for solving of 1D problem. I have > searched in matrices of 1D problem in time and they are all nontrivial, > but it gives me vector of trivial solutions. Assembling of 1D problem is > therefore OK, but in solving, there is some problem. In method solve for > 1D i call system_matrix2.n_nonzero_elements() and it gives me nonzero > number(13). But how is possible, that it gives me a trivial solution of > 1D problem.
By "trivial" do you mean a solution that is constant zero? > P.S.: Right hand side is initialized from previous time iteration, > therefore it is zero. I'm not sure what you mean: if the right hand side is zero and the matrix is non-singular, then the solution of the linear system is zero as well, right? W. ------------------------------------------------------------------------- Wolfgang Bangerth email: [email protected] www: http://www.math.tamu.edu/~bangerth/ _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
