libMesh
naviersystem.h
Go to the documentation of this file.
1 // The libMesh Finite Element Library.
2 // Copyright (C) 2002-2017 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
3 
4 // This library is free software; you can redistribute it and/or
5 // modify it under the terms of the GNU Lesser General Public
6 // License as published by the Free Software Foundation; either
7 // version 2.1 of the License, or (at your option) any later version.
8 
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 // Lesser General Public License for more details.
13 
14 // You should have received a copy of the GNU Lesser General Public
15 // License along with this library; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 
18 // DiffSystem framework files
19 #include "libmesh/fem_system.h"
20 
21 using namespace libMesh;
22 
23 // The Navier-Stokes system class.
24 // FEMSystem, TimeSolver and NewtonSolver will handle most tasks,
25 // but we must specify element residuals
26 class NavierSystem : public FEMSystem
27 {
28 public:
29  // Constructor
31  const std::string & name_in,
32  const unsigned int number_in)
33  : FEMSystem(es, name_in, number_in), Reynolds(1.), application(0) {}
34 
35  // System initialization
36  virtual void init_data ();
37 
38  // Context initialization
39  virtual void init_context(DiffContext & context);
40 
41  // Element residual and jacobian calculations
42  // Time dependent parts
43  virtual bool element_time_derivative (bool request_jacobian,
44  DiffContext & context);
45 
46  // Constraint parts
47  virtual bool element_constraint (bool request_jacobian,
48  DiffContext & context);
49  virtual bool side_constraint (bool request_jacobian,
50  DiffContext & context);
51 
52  // Mass matrix part
53  virtual bool mass_residual (bool request_jacobian,
54  DiffContext & context);
55 
56  // Postprocessed output
57  virtual void postprocess ();
58 
59  // Indices for each variable;
60  unsigned int p_var, u_var, v_var, w_var;
61 
62  // The Reynolds number to solve for
64 
65  // The application number controls what boundary conditions and/or
66  // forcing functions are applied. Current options are:
67  // 0 - discontinuous lid velocity driven cavity
68  // 1 - homogeneous Dirichlet BC with smooth forcing
69  unsigned int application;
70 
71  // Returns the value of a forcing function at point p. This value
72  // depends on which application is being used.
73  Point forcing(const Point & p);
74 };
This is the EquationSystems class.
unsigned int w_var
Definition: naviersystem.h:60
This class provides all data required for a physics package (e.g.
Definition: diff_context.h:54
unsigned int application
Definition: naviersystem.h:69
The libMesh namespace provides an interface to certain functionality in the library.
This class provides a specific system class.
Definition: fem_system.h:53
DIE A HORRIBLE DEATH HERE typedef LIBMESH_DEFAULT_SCALAR_TYPE Real
NavierSystem(EquationSystems &es, const std::string &name_in, const unsigned int number_in)
Definition: naviersystem.h:30
A Point defines a location in LIBMESH_DIM dimensional Real space.
Definition: point.h:38