Demo problem: Turek & Hron's FSI benchmark problem - Oomph-lib

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18 Demo problem: Turek & Hron’s FSI benchmark problem { Fluid_mesh_pt->boundary_node_pt(ibound, inod)-> set_auxiliary_node_update_fct_pt( FSI_functions::apply_no_slip_on_moving_wall); } } // done automatic application of no-slip Next, we set up the lookup schemes required by the FSISolidTractionElements to establish which fluid elements affect the traction onto the solid: // Work out which fluid dofs affect the residuals of the wall elements: // We pass the boundary between the fluid and solid meshes and // pointers to the meshes. The interaction boundary are boundaries 5,6,7 // of the 2D fluid mesh. FSI_functions::setup_fluid_load_info_for_solid_elements (this,5,Fluid_mesh_pt,Traction_mesh_pt[0]); FSI_functions::setup_fluid_load_info_for_solid_elements (this,6,Fluid_mesh_pt,Traction_mesh_pt[2]); FSI_functions::setup_fluid_load_info_for_solid_elements (this,7,Fluid_mesh_pt,Traction_mesh_pt[1]); } All interactions have now been specified and we conclude by assigning the equation numbers // Assign equation numbers cout
1.10 Actions before Newton convergence check 19 //What is the index of the face of the element e along boundary b int face_index = solid_mesh_pt()->face_index_at_boundary(b,e); // Create new element and add to mesh Traction_mesh_pt[b]->add_element_pt( new FSISolidTractionElement(bulk_elem_pt,face_index)); } //end of loop over bulk elements adjacent to boundary b // Identify unique nodes unsigned nnod=solid_mesh_pt()->nboundary_node(b); for (unsigned j=0;jboundary_node_pt(b,j)); } } // Build combined mesh of fsi traction elements Combined_traction_mesh_pt=new SolidMesh(Traction_mesh_pt); // Stick nodes into combined traction mesh for (std::set::iterator it=all_nodes.begin(); it!=all_nodes.end();it++) { Combined_traction_mesh_pt->add_node_pt(*it); } } // end of create_traction_elements 1.10 Actions before Newton convergence check The algebraic node-update procedure updates the positions in response to changes in the solid displacements but this is not done automatically when the Newton solver updates the solid mechanics degrees of freedom. We therefore force a node-update before the Newton convergence check. //====start_of_actions_before_newton_convergence_check=================== /// Update the (enslaved) fluid node positions following the /// update of the solid variables //======================================================================= template void TurekProblem ::actions_before_newton_convergence_check () { fluid_mesh_pt()->node_update(); } 1.11 Actions before the timestep Before each timestep we update the inflow profile for all fluid nodes on mesh boundary 3. //===== start_of_actions_before_implicit_timestep========================= /// Actions before implicit timestep: Update inflow profile //======================================================================== template void TurekProblem:: actions_before_implicit_timestep() { // Current time double t=time_pt()->time(); Generated on Mon Aug 10 11:44:25 2009 by Doxygen
Page 1 and 2: Chapter 1 Demo problem: Turek & Hro
Page 3 and 4: 1.2 Parameter values for the benchm
Page 5 and 6: 1.4 Overview of the driver code 5 F
Page 7 and 8: 1.5 Parameter values for the benchm
Page 9 and 10: 1.6 The driver code 9 interpreted a
Page 11 and 12: 1.7 The Problem class 11 { public:
Page 13 and 14: 1.8 The problem constructor 13 Z2Er
Page 15 and 16: 1.8 The problem constructor 15 // n
Page 17: 1.8 The problem constructor 17 Glob
Page 21 and 22: 1.13 Post-processing 21 } } // Re-s
Page 23: 1.16 Source files for this tutorial

Demo problem: Turek & Hron's FSI benchmark problem - Oomph-lib

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