| 1 | /*
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| 2 | * vmg - a versatile multigrid solver
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| 3 | * Copyright (C) 2012 Institute for Numerical Simulation, University of Bonn
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| 4 | *
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| 5 | * vmg is free software: you can redistribute it and/or modify
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| 6 | * it under the terms of the GNU General Public License as published by
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| 7 | * the Free Software Foundation, either version 3 of the License, or
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| 8 | * (at your option) any later version.
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| 9 | *
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| 10 | * vmg is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | * GNU General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU General Public License
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| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 17 | */
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| 18 |
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| 19 | /**
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| 20 | * @file discretization_poisson_fv.hpp
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| 21 | * @author Julian Iseringhausen <isering@ins.uni-bonn.de>
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| 22 | * @date Mon Apr 18 13:03:47 2011
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| 23 | *
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| 24 | * @brief Finite volume discretization for the Poisson
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| 25 | * equation. Absolutely equivalent to the finite
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| 26 | * difference discretization unless you use
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| 27 | * hierarchically coarsened grids.
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| 28 | *
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| 29 | */
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| 30 |
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| 31 | #ifndef DISCRETIZATION_POISSON_FV_HPP_
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| 32 | #define DISCRETIZATION_POISSON_FV_HPP_
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| 33 |
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| 34 | #include "base/discretization.hpp"
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| 35 | #include "base/helper.hpp"
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| 36 |
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| 37 | namespace VMG
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| 38 | {
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| 39 |
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| 40 | class DiscretizationPoissonFV : public Discretization
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| 41 | {
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| 42 | public:
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| 43 | DiscretizationPoissonFV(const int& order) :
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| 44 | Discretization(order)
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| 45 | {
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| 46 | InitDiscretizationPoissonFV();
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| 47 | }
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| 48 |
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| 49 | vmg_float OperatorPrefactor(const Grid& grid) const
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| 50 | {
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| 51 | return 1.0 / Helper::pow_2(grid.Extent().MeshWidth().Max());
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| 52 | }
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| 53 |
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| 54 | void ModifyRightHandSide();
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| 55 |
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| 56 | private:
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| 57 | void InitDiscretizationPoissonFV();
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| 58 | void SetInnerBoundaryCompute(Grid& sol_f, Grid& rhs_f, Grid& sol_c) const;
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| 59 | };
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| 60 |
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| 61 | }
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| 62 |
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| 63 | #endif /* DISCRETIZATION_POISSON_FV_HPP_ */
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