knuppMetric.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | cfMesh: A library for mesh generation
   \\    /   O peration     |
    \\  /    A nd           | Author: Franjo Juretic (franjo.juretic@c-fields.com)
     \\/     M anipulation  | Copyright (C) Creative Fields, Ltd.
-------------------------------------------------------------------------------
License
    This file is part of cfMesh.
 
    cfMesh 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 3 of the License, or (at your
    option) any later version.
 
    cfMesh 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 cfMesh.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    knuppMetric
 
Description
    Mesh smoothing using Knupp's metric. The metric is non-zero for inverted
    tets only
 
SourceFiles
    knuppMetric.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef knuppMetric_H
#define knuppMetric_H
 
#include "simplexSmoother.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
    
// Forward declarations
class partTetMeshSimplex;
 
/*---------------------------------------------------------------------------*\
                           Class knuppMetric Declaration
\*---------------------------------------------------------------------------*/
 
//- class for mesh untangler
class knuppMetric
:
    public simplexSmoother
{
    // Private data
    //- free vertex
    point& p_;
    
        //- normals of triangles forming the outer hull
        DynList<vector, 64> normals_;
    
        //- centres of triangles forming the outer hull
        DynList<point, 64> centres_;
    
        //- control parameter. It helps the point get inside the feasible region
        scalar beta_;
    
    // Private member functions
        //- evaluate the value of the metric
        scalar evaluateMetric() const;
        scalar evaluateMetricNoBeta() const;
    
        //- evaluate metric gradients
        void evaluateGradients(vector& grad, tensor& gradGrad) const;
 
    public:
 
    knuppMetric(partTetMeshSimplex& simplex);
 
    // Destructor
    ~knuppMetric();
 
    // Member functions
    //- find the best position such that all tets making a simplex
    //- have a positive volume
    void optimizeNodePosition(const scalar tol = 0.001);
};
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //