Example #1
0
int main()
{
  // Structure sub domain
  class Structure : public SubDomain
  {
    bool inside(const Array<double>& x, bool on_boundary) const
    {
      return x[0] > 1.4 - DOLFIN_EPS and x[0] < 1.6 + DOLFIN_EPS
                                                and x[1] < 0.6 + DOLFIN_EPS;
    }
  };

  // Create mesh
  auto mesh = std::make_shared<RectangleMesh>(Point(0.0, 0.0),
                                              Point(3.0, 1.0), 60, 20);

  // Create sub domain markers and mark everything as 0
  MeshFunction<std::size_t> sub_domains(mesh, mesh->topology().dim());
  sub_domains = 0;

  // Mark structure domain as 1
  Structure structure;
  structure.mark(sub_domains, 1);

  // Extract sub meshes
  auto fluid_mesh = std::make_shared<SubMesh>(*mesh, sub_domains, 0);
  auto structure_mesh = std::make_shared<SubMesh>(*mesh, sub_domains, 1);

  // Move structure mesh
  MeshGeometry& geometry = structure_mesh->geometry();

  for (VertexIterator v(*structure_mesh); !v.end(); ++v)
  {
    std::array<double, 2> x = {{v->x()[0], v->x()[1]}};
    x[0] += 0.1*x[0]*x[1];
    geometry.set(v->index(), x.data());
  }

  // Move fluid mesh according to structure mesh
  ALE::move(fluid_mesh, *structure_mesh);
  fluid_mesh->smooth();

  // Plot meshes
  plot(fluid_mesh);
  plot(structure_mesh);

  interactive();

  return 0;
}
Example #2
0
int main()
{
  // Structure sub domain
  class Structure : public SubDomain
  {
    bool inside(const Array<double>& x, bool on_boundary) const
    {
      return x[0] > 1.4 - DOLFIN_EPS and x[0] < 1.6 + DOLFIN_EPS and x[1] < 0.6 + DOLFIN_EPS;
    }
  };

  // Create mesh
  RectangleMesh mesh(0.0, 0.0, 3.0, 1.0, 60, 20);

  // Create sub domain markers and mark everything as 0
  MeshFunction<std::size_t> sub_domains(mesh, mesh.topology().dim());
  sub_domains = 0;

  // Mark structure domain as 1
  Structure structure;
  structure.mark(sub_domains, 1);

  // Extract sub meshes
  SubMesh fluid_mesh(mesh, sub_domains, 0);
  SubMesh structure_mesh(mesh, sub_domains, 1);

  // Move structure mesh
  MeshGeometry& geometry = structure_mesh.geometry();
  for (VertexIterator v(structure_mesh); !v.end(); ++v)
  {
    const double* x = v->x();
    geometry.x(v->index())[0] += 0.1*x[0]*x[1];
  }

  // Move fluid mesh according to structure mesh
  fluid_mesh.move(structure_mesh);
  fluid_mesh.smooth();

  // Plot meshes
  plot(fluid_mesh);
  plot(structure_mesh);

  interactive();

  return 0;
}