FreeFOAM The Cross-Platform CFD Toolkit
solidDisplacementFoam.C
Go to the documentation of this file.
1 /*---------------------------------------------------------------------------*\
2  ========= |
3  \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
4  \\ / O peration |
5  \\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
6  \\/ M anipulation |
7 -------------------------------------------------------------------------------
8 License
9  This file is part of OpenFOAM.
10 
11  OpenFOAM is free software: you can redistribute it and/or modify it
12  under the terms of the GNU General Public License as published by
13  the Free Software Foundation, either version 3 of the License, or
14  (at your option) any later version.
15 
16  OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
17  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19  for more details.
20 
21  You should have received a copy of the GNU General Public License
22  along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
23 
24 Application
25  solidDisplacementFoam
26 
27 Description
28  Transient segregated finite-volume solver of linear-elastic,
29  small-strain deformation of a solid body, with optional thermal
30  diffusion and thermal stresses.
31 
32  Simple linear elasticity structural analysis code.
33  Solves for the displacement vector field D, also generating the
34  stress tensor field sigma.
35 
36 Usage
37  - solidDisplacementFoam [OPTION]
38 
39  @param -case <dir> \n
40  Specify the case directory
41 
42  @param -parallel \n
43  Run the case in parallel
44 
45  @param -help \n
46  Display short usage message
47 
48  @param -doc \n
49  Display Doxygen documentation page
50 
51  @param -srcDoc \n
52  Display source code
53 
54 \*---------------------------------------------------------------------------*/
55 
56 #include <finiteVolume/fvCFD.H>
57 #include <OpenFOAM/Switch.H>
58 
59 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
60 
61 int main(int argc, char *argv[])
62 {
63  #include <OpenFOAM/setRootCase.H>
64 
65  #include <OpenFOAM/createTime.H>
66  #include <OpenFOAM/createMesh.H>
68  #include "readThermalProperties.H"
70  #include "createFields.H"
71 
72  // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
73 
74  Info<< "\nCalculating displacement field\n" << endl;
75 
76  while (runTime.loop())
77  {
78  Info<< "Iteration: " << runTime.value() << nl << endl;
79 
81 
82  int iCorr = 0;
83  scalar initialResidual = 0;
84 
85  do
86  {
87  if (thermalStress)
88  {
89  volScalarField& T = Tptr();
90  solve
91  (
92  fvm::ddt(T) == fvm::laplacian(DT, T)
93  );
94  }
95 
96  {
97  fvVectorMatrix DEqn
98  (
99  fvm::d2dt2(D)
100  ==
101  fvm::laplacian(2*mu + lambda, D, "laplacian(DD,D)")
102  + divSigmaExp
103  );
104 
105  if (thermalStress)
106  {
107  const volScalarField& T = Tptr();
108  DEqn += fvc::grad(threeKalpha*T);
109  }
110 
111  //DEqn.setComponentReference(1, 0, vector::X, 0);
112  //DEqn.setComponentReference(1, 0, vector::Z, 0);
113 
114  initialResidual = DEqn.solve().initialResidual();
115 
116  if (!compactNormalStress)
117  {
118  divSigmaExp = fvc::div(DEqn.flux());
119  }
120  }
121 
122  {
123  volTensorField gradD = fvc::grad(D);
124  sigmaD = mu*twoSymm(gradD) + (lambda*I)*tr(gradD);
125 
127  {
128  divSigmaExp = fvc::div
129  (
130  sigmaD - (2*mu + lambda)*gradD,
131  "div(sigmaD)"
132  );
133  }
134  else
135  {
136  divSigmaExp += fvc::div(sigmaD);
137  }
138  }
139 
140  } while (initialResidual > convergenceTolerance && ++iCorr < nCorr);
141 
142  #include "calculateStress.H"
143 
144  Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
145  << " ClockTime = " << runTime.elapsedClockTime() << " s"
146  << nl << endl;
147  }
148 
149  Info<< "End\n" << endl;
150 
151  return 0;
152 }
153 
154 
155 // ************************ vim: set sw=4 sts=4 et: ************************ //