Line data    Source code

       1             : // The libMesh Finite Element Library.
       2             : // Copyright (C) 2002-2025 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             : 
      19             : 
      20             : #ifndef LIBMESH_QUADRATURE_NODAL_H
      21             : #define LIBMESH_QUADRATURE_NODAL_H
      22             : 
      23             : // Local includes
      24             : #include "libmesh/quadrature.h"
      25             : 
      26             : namespace libMesh
      27             : {
      28             : 
      29             : /**
      30             :  * This class implements nodal quadrature rules for various element
      31             :  * types. For some element types, this corresponds to well-known
      32             :  * quadratures such as the trapezoidal rule and Simpson's rule. For
      33             :  * other element types (e.g. the serendipity QUAD8/HEX20/PRISM15) it
      34             :  * implements a lower-order-accurate nodal quadrature which still
      35             :  * generates a strictly positive definite (diagonal) mass matrix.
      36             :  * Since the main purpose of this class is provide appropriate nodal
      37             :  * quadrature rules, "order" arguments passed during initialization
      38             :  * are ignored.
      39             :  *
      40             :  * \author John W. Peterson
      41             :  * \date 2019
      42             :  * \brief Implements nodal quadrature for various element types.
      43             :  */
      44             : class QNodal : public QBase
      45             : {
      46             : public:
      47             : 
      48             :   /**
      49             :    * Constructor.  Declares the order of the quadrature rule.  We
      50             :    * explicitly call the \p init function in 1D since the other
      51             :    * tensor-product rules require this one.
      52             :    *
      53             :    * \note The element type, EDGE2, will not be used internally,
      54             :    * however if we called the function with INVALID_ELEM it would try
      55             :    * to be smart and return, thinking it had already done the work.
      56             :    */
      57             :   explicit
      58       81014 :   QNodal (unsigned int dim,
      59       81014 :          Order order=FIRST) :
      60       81014 :     QBase(dim,order)
      61             :   {
      62       81014 :     if (dim == 1)
      63         355 :       init(EDGE2);
      64       81014 :   }
      65             : 
      66             :   /**
      67             :    * Copy/move ctor, copy/move assignment operator, and destructor are
      68             :    * all explicitly defaulted for this simple class.
      69             :    */
      70           0 :   QNodal (const QNodal &) = default;
      71             :   QNodal (QNodal &&) = default;
      72             :   QNodal & operator= (const QNodal &) = default;
      73             :   QNodal & operator= (QNodal &&) = default;
      74       81082 :   virtual ~QNodal() = default;
      75             : 
      76             :   /**
      77             :    * \returns \p QNODAL.
      78             :    */
      79             :   virtual QuadratureType type() const override;
      80             : 
      81             :   virtual std::unique_ptr<QBase> clone() const override;
      82             : 
      83             : private:
      84             : 
      85             :   virtual void init_1D () override;
      86             :   virtual void init_2D () override;
      87             :   virtual void init_3D () override;
      88             : };
      89             : 
      90             : } // namespace libMesh
      91             : 
      92             : #endif // LIBMESH_QUADRATURE_NODAL_H