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_fd.hpp
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21 | * @author Julian Iseringhausen <isering@ins.uni-bonn.de>
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22 | * @date Mon Apr 18 13:01:40 2011
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23 | *
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24 | * @brief Finite difference discretization of the
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25 | * Poisson equation.
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26 | *
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27 | */
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28 |
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29 | #ifndef DISCRETIZATION_POISSON_FD_HPP_
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30 | #define DISCRETIZATION_POISSON_FD_HPP_
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31 |
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32 | #include "base/discretization.hpp"
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33 | #include "base/helper.hpp"
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34 |
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35 | namespace VMG
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36 | {
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37 |
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38 | class DiscretizationPoissonFD : public Discretization
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39 | {
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40 | public:
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41 | DiscretizationPoissonFD(const int& order) :
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42 | Discretization(order)
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43 | {
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44 | InitDiscretizationPoissonFD();
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45 | }
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46 |
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47 | vmg_float OperatorPrefactor(const Grid& grid) const
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48 | {
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49 | return 1.0 / Helper::pow_2(grid.Extent().MeshWidth().Max());
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50 | }
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51 |
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52 | void ModifyRightHandSide();
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53 |
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54 | private:
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55 | void InitDiscretizationPoissonFD();
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56 | };
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57 |
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58 | }
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59 |
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60 | #endif /* DISCRETIZATION_POISSON_FD_HPP_ */
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