source: issm/trunk/src/m/solvers/solver_stokescoupling_nonlinear.m@ 6013

function femmodel=solver_couplingstokes_nonlinear(femmodel,conserve_loads)
%SOLVER_COUPLINGSTOKES_NONLINEAR - core solver of coupling run
%
%   Usage:
%      [femmodel]=solver_couplingstokes_nonlinear(femmodel,conserve_loads)

        %Get parameters
        kffpartitioning=femmodel.parameters.Kff;

        %initialize solution vector
        converged=0; count=1;

        %First get ug=ug_horiz+ug_vert
        femmodel=SetCurrentConfiguration(femmodel,DiagnosticHorizAnalysisEnum);
        ug_horiz=GetSolutionFromInputs(femmodel.elements, femmodel.nodes, femmodel.vertices, femmodel.loads, femmodel.materials, femmodel.parameters);

        femmodel=SetCurrentConfiguration(femmodel,DiagnosticVertAnalysisEnum);
        ug_vert=GetSolutionFromInputs(femmodel.elements, femmodel.nodes, femmodel.vertices, femmodel.loads, femmodel.materials, femmodel.parameters);

        while(~converged),

                %First compute the horizontal velocity
                femmodel=SetCurrentConfiguration(femmodel,DiagnosticHorizAnalysisEnum);

                %Start non-linear iteration using input velocity: 
                ug_horiz=GetSolutionFromInputs(femmodel.elements, femmodel.nodes, femmodel.vertices, femmodel.loads, femmodel.materials, femmodel.parameters);
                uf_horiz=Reducevectorgtof( ug_horiz, femmodel.nodesets,femmodel.parameters);

                %Update the solution to make sure that vx and vxold are similar
                [femmodel.elements,femmodel.materials]=InputUpdateFromSolution(femmodel.elements,femmodel.nodes,femmodel.vertices,femmodel.loads,femmodel.materials,femmodel.parameters,ug_horiz);

                %save pointer to old velocity
                old_ug_horiz=ug_horiz;
                old_uf_horiz=uf_horiz;

                if kffpartitioning,
                        [K_gg,K_ff,K_fs,p_g,p_f,kmax]=SystemMatrices(femmodel.elements,femmodel.nodes,femmodel.vertices,femmodel.loads,femmodel.materials,femmodel.parameters);
                        p_f = Reduceload( p_f, K_fs, femmodel.ys,femmodel.parameters);
                else
                        [K_gg,K_ff,K_fs,p_g,p_f,kmax]=SystemMatrices(femmodel.elements,femmodel.nodes,femmodel.vertices,femmodel.loads,femmodel.materials,femmodel.parameters);
                        [K_ff, K_fs] = Reducematrixfromgtof( K_gg, femmodel.nodesets,femmodel.parameters); 
                        p_f = Reduceloadfromgtof( p_g, K_fs, femmodel.ys, femmodel.nodesets,femmodel.parameters);
                end

                uf_horiz=Solver(K_ff,p_f,old_uf_horiz,femmodel.parameters);
                ug_horiz= Mergesolutionfromftog( uf_horiz, femmodel.ys, femmodel.nodesets,femmodel.parameters); 

                [femmodel.elements,femmodel.materials]=InputUpdateFromSolution(femmodel.elements,femmodel.nodes,femmodel.vertices,femmodel.loads,femmodel.materials,femmodel.parameters,ug_horiz);

                %Figure out if convergence have been reached
                converged=convergence(K_ff,p_f,uf_horiz,old_uf_horiz,femmodel.parameters);
                converged=1;

%               %Then compute vertical velocity
%               femmodel=SetCurrentConfiguration(femmodel,DiagnosticVertAnalysisEnum);
%       if kffpartitioning,
%               [K_gg,K_ff,K_fs,p_g,p_f,kmax]=SystemMatrices(femmodel.elements,femmodel.nodes,femmodel.vertices,femmodel.loads,femmodel.materials,femmodel.parameters);
%               p_f = Reduceload( p_f, K_fs, femmodel.ys,femmodel.parameters);
%       else
%               [K_gg,K_ff,K_fs,p_g,p_f,kmax]=SystemMatrices(femmodel.elements,femmodel.nodes,femmodel.vertices,femmodel.loads,femmodel.materials,femmodel.parameters);
%               [K_ff, K_fs] = Reducematrixfromgtof( K_gg, femmodel.nodesets,femmodel.parameters); 
%               p_f = Reduceloadfromgtof( p_g, K_fs, femmodel.ys, femmodel.nodesets,femmodel.parameters);
%       end
%
%               displaystring(femmodel.parameters.Verbose>1,'%s%g','      condition number of stiffness matrix: ',condest(K_ff));
%               uf_vert=Solver(K_ff,p_f,[],femmodel.parameters);
%
%               ug_vert= Mergesolutionfromftog( uf_vert, femmodel.ys, femmodel.nodesets,femmodel.parameters); 
%
%               [femmodel.elements,femmodel.materials]=InputUpdateFromSolution(femmodel.elements,femmodel.nodes,femmodel.vertices,femmodel.loads,femmodel.materials,femmodel.parameters,ug_vert);

        end
end