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// This file is part of ff3d - http://www.freefem.org/ff3d
// Copyright (C) 2001, 2002, 2003 Stphane Del Pino
// 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, 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.
// $Id: DivMuGrad.hpp,v 1.2 2003/09/20 21:31:09 delpinux Exp $
// Implement the - div(grad()) operator, in the domain.
// using finit differences on a Structured3DMesh
#ifndef _DIVMUGRAD_
#define _DIVMUGRAD_
#include <PDEOperator.hpp>
/*!
\class DivMuGrad
This class describes second order partial differencial operators of the form:
\f$ \nabla\cdot \mu \nabla \f$ where
\f$
\begin{array}{ll}
\mu: &\Omega \to R \\
&x \mapsto \mu(x)
\end{array}
\f$.
\par example:
if \f$ \mu = 1 \f$, the operator is the Laplacian.
\author Stphane Del Pino
*/
class DivMuGrad
: public PDEOperator
{
//! The function \f$ \mu \f$
ReferenceCounting<UserFunction> __mu;
public:
const UserFunction& coefficient(const size_t i)
{
assert (i<1);
return (*__mu);
}
//! The name of the type of operator.
std::string TypeName() const
{
return std::string("DivMuGrad");
}
//! Access to the function \f$ \mu \f$.
UserFunction& mu()
{
return *__mu;
}
//! Read-only access to the function \f$ \mu \f$.
const UserFunction& mu() const
{
return *__mu;
}
ReferenceCounting<PDEOperator> operator * (ConstReferenceCounting<UserFunction> u) const
{
ReferenceCounting<UserFunction> newMu = new MulUserFunction(__mu,u);
return (new DivMuGrad(newMu));
}
//! Returns a pointer on the opposed DivMuGrad operator.
ReferenceCounting<PDEOperator> operator - () const
{
ReferenceCounting<UserFunction> newMu = new UnaryMinusUserFunction(__mu);
return (new DivMuGrad(newMu));
}
//! Constructs a function \a initMu.
DivMuGrad(ReferenceCounting<UserFunction> initMu)
: PDEOperator(PDEOperator::divmugrad,
1),
__mu(initMu)
{
;
}
//! Copy constructor.
DivMuGrad(const DivMuGrad& D)
: PDEOperator(D),
__mu(D.__mu)
{
;
}
//! Destrutor.
~DivMuGrad()
{
;
}
};
#endif // _DIVMUGRAD_
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