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41 results

Gradient.cpp

Blame
  • Lambda2.cpp 9.21 KiB
    // $Id: Lambda2.cpp,v 1.8 2005-01-08 20:15:19 geuzaine Exp $
    //
    // Copyright (C) 1997-2005 C. Geuzaine, J.-F. Remacle
    //
    // This program is free software; you can redistribute it and/or modify
    // it under the terms of the GNU General Public License as published by
    // the Free Software Foundation; either version 2 of the License, or
    // (at your option) any later version.
    //
    // This program is distributed in the hope that it will be useful,
    // but WITHOUT ANY WARRANTY; without even the implied warranty of
    // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    // GNU General Public License for more details.
    //
    // You should have received a copy of the GNU General Public License
    // along with this program; if not, write to the Free Software
    // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
    // USA.
    // 
    // Please report all bugs and problems to <gmsh@geuz.org>.
    
    #include "Plugin.h"
    #include "Lambda2.h"
    #include "List.h"
    #include "Views.h"
    #include "Context.h"
    #include "Numeric.h"
    #include "ShapeFunctions.h"
    #include <math.h>
    #include <stdio.h>
    
    extern Context_T CTX;
    
    StringXNumber Lambda2Options_Number[] = {
      {GMSH_FULLRC, "Eigenvalue", NULL, 2.},
      {GMSH_FULLRC, "iView", NULL, -1.}
    };
    
    extern "C"
    {
      GMSH_Plugin *GMSH_RegisterLambda2Plugin()
      {
        return new GMSH_Lambda2Plugin();
      }
    }
    
    GMSH_Lambda2Plugin::GMSH_Lambda2Plugin()
    {
      ;
    }
    
    void GMSH_Lambda2Plugin::getName(char *name) const
    {
      strcpy(name, "Lambda2");
    }
    
    void GMSH_Lambda2Plugin::getInfos(char *author, char *copyright,
    				   char *help_text) const
    {
      strcpy(author, "E. Marchandise");
      strcpy(copyright, "DGR (www.multiphysics.com)");
      strcpy(help_text,
             "Plugin(Lambda2) computes the eigenvalues\n"
    	 "Lambda(1,2,3) of the tensor (S_ik S_kj +\n"
    	 "Om_ik Om_kj), where S_ij = 0.5 (ui,j + uj,i)\n"
    	 "and Om_ij = 0.5 (ui,j - uj,i) are respectively\n"
    	 "the symmetric and antisymmetric parts of the\n"
    	 "velocity gradient tensor. Vortices are well\n"
    	 "represented by regions where Lambda(2) is\n"
    	 "negative. If `iView' contains tensor elements,\n"