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annotate +scheme/Heat2dVariable.m @ 688:eb2f9233acc3 feature/poroelastic

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Add scheme Heat2dVariable
author Martin Almquist <malmquist@stanford.edu>
date Mon, 12 Feb 2018 13:39:39 -0800
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children 60eb7f46d8d9
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1 classdef Heat2dVariable < scheme.Scheme
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2
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3 % Discretizes the Laplacian with variable coefficent,
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4 % In the Heat equation way (i.e., the discretization matrix is not necessarily
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5 % symmetric)
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6 % u_t = div * (kappa * grad u )
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7 % opSet should be cell array of opSets, one per dimension. This
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8 % is useful if we have periodic BC in one direction.
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9
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10 properties
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11 m % Number of points in each direction, possibly a vector
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12 h % Grid spacing
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13
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14 grid
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15 dim
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16
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17 order % Order of accuracy for the approximation
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18
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19 % Diagonal matrix for variable coefficients
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20 KAPPA % Variable coefficient
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21
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22 D % Total operator
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23 D1 % First derivatives
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24
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25 % Second derivatives
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26 D2_kappa
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27
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28 H, Hi % Inner products
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29 e_l, e_r
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30 d1_l, d1_r % Normal derivatives at the boundary
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31
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32 H_boundary % Boundary inner products
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33
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34 end
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35
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36 methods
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37
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38 function obj = Heat2dVariable(g ,order, kappa_fun, opSet)
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39 default_arg('opSet',{@sbp.D2Variable, @sbp.D2Variable});
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40 default_arg('kappa_fun', @(x,y) 0*x+1);
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41 dim = 2;
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42
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43 assert(isa(g, 'grid.Cartesian'))
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44
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45 kappa = grid.evalOn(g, kappa_fun);
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46 m = g.size();
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47 m_tot = g.N();
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48
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49 h = g.scaling();
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50 lim = g.lim;
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51
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52 % 1D operators
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53 ops = cell(dim,1);
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54 for i = 1:dim
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55 ops{i} = opSet{i}(m(i), lim{i}, order);
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56 end
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57
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58 I = cell(dim,1);
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59 D1 = cell(dim,1);
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60 D2 = cell(dim,1);
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61 H = cell(dim,1);
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62 Hi = cell(dim,1);
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63 e_l = cell(dim,1);
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64 e_r = cell(dim,1);
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65 d1_l = cell(dim,1);
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66 d1_r = cell(dim,1);
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67
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68 for i = 1:dim
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69 I{i} = speye(m(i));
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70 D1{i} = ops{i}.D1;
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71 D2{i} = ops{i}.D2;
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72 H{i} = ops{i}.H;
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73 Hi{i} = ops{i}.HI;
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74 e_l{i} = ops{i}.e_l;
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75 e_r{i} = ops{i}.e_r;
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76 d1_l{i} = ops{i}.d1_l;
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77 d1_r{i} = ops{i}.d1_r;
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78 end
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79
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80 %====== Assemble full operators ========
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81 KAPPA = spdiag(kappa);
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82 obj.KAPPA = KAPPA;
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83
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84 obj.D1 = cell(dim,1);
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85 obj.D2_kappa = cell(dim,1);
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86 obj.e_l = cell(dim,1);
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87 obj.e_r = cell(dim,1);
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88 obj.d1_l = cell(dim,1);
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89 obj.d1_r = cell(dim,1);
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90
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91 % D1
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92 obj.D1{1} = kron(D1{1},I{2});
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93 obj.D1{2} = kron(I{1},D1{2});
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94
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95 % Boundary operators
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96 obj.e_l{1} = kron(e_l{1},I{2});
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97 obj.e_l{2} = kron(I{1},e_l{2});
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98 obj.e_r{1} = kron(e_r{1},I{2});
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99 obj.e_r{2} = kron(I{1},e_r{2});
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100
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101 obj.d1_l{1} = kron(d1_l{1},I{2});
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102 obj.d1_l{2} = kron(I{1},d1_l{2});
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103 obj.d1_r{1} = kron(d1_r{1},I{2});
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104 obj.d1_r{2} = kron(I{1},d1_r{2});
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105
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106 % D2
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107 for i = 1:dim
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108 obj.D2_kappa{i} = sparse(m_tot);
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109 end
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110 ind = grid.funcToMatrix(g, 1:m_tot);
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111
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112 for i = 1:m(2)
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113 D_kappa = D2{1}(kappa(ind(:,i)));
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114 p = ind(:,i);
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115 obj.D2_kappa{1}(p,p) = D_kappa;
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116 end
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117
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118 for i = 1:m(1)
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119 D_kappa = D2{2}(kappa(ind(i,:)));
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120 p = ind(i,:);
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121 obj.D2_kappa{2}(p,p) = D_kappa;
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122 end
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123
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124 % Quadratures
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125 obj.H = kron(H{1},H{2});
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126 obj.Hi = inv(obj.H);
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127 obj.H_boundary = cell(dim,1);
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128 obj.H_boundary{1} = H{2};
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129 obj.H_boundary{2} = H{1};
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130
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131 % Differentiation matrix D (without SAT)
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132 D2_kappa = obj.D2_kappa;
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133 D1 = obj.D1;
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134 D = sparse(m_tot,m_tot);
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135 for i = 1:dim
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136 D = D + D2_kappa{i};
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137 end
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138 obj.D = D;
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139 %=========================================%
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140
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141 % Misc.
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142 obj.m = m;
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143 obj.h = h;
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144 obj.order = order;
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145 obj.grid = g;
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146 obj.dim = dim;
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147
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148 end
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149
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150
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151 % Closure functions return the operators applied to the own domain to close the boundary
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152 % Penalty functions return the operators to force the solution. In the case of an interface it returns the operator applied to the other doamin.
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153 % boundary is a string specifying the boundary e.g. 'l','r' or 'e','w','n','s'.
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154 % type is a string specifying the type of boundary condition.
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155 % data is a function returning the data that should be applied at the boundary.
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156 % neighbour_scheme is an instance of Scheme that should be interfaced to.
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Martin Almquist <malmquist@stanford.edu>
parents:
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157 % neighbour_boundary is a string specifying which boundary to interface to.
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Martin Almquist <malmquist@stanford.edu>
parents:
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158 function [closure, penalty] = boundary_condition(obj, boundary, type, parameter)
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Martin Almquist <malmquist@stanford.edu>
parents:
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159 default_arg('type','Neumann');
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Martin Almquist <malmquist@stanford.edu>
parents:
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160 default_arg('parameter', []);
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Martin Almquist <malmquist@stanford.edu>
parents:
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161
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Martin Almquist <malmquist@stanford.edu>
parents:
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162 % j is the coordinate direction of the boundary
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Martin Almquist <malmquist@stanford.edu>
parents:
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163 % nj: outward unit normal component.
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
164 % nj = -1 for west, south, bottom boundaries
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
165 % nj = 1 for east, north, top boundaries
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Martin Almquist <malmquist@stanford.edu>
parents:
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166 [j, nj] = obj.get_boundary_number(boundary);
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
167 switch nj
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
168 case 1
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
169 e = obj.e_r;
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
170 d = obj.d1_r;
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
171 case -1
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
172 e = obj.e_l;
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
173 d = obj.d1_l;
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
174 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
175
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
176 Hi = obj.Hi;
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
177 H_gamma = obj.H_boundary{j};
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
178 KAPPA = obj.KAPPA;
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Martin Almquist <malmquist@stanford.edu>
parents:
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179 kappa_gamma = e{j}'*KAPPA*e{j};
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Martin Almquist <malmquist@stanford.edu>
parents:
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180
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
181 switch type
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Martin Almquist <malmquist@stanford.edu>
parents:
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182
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Martin Almquist <malmquist@stanford.edu>
parents:
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183 % Dirichlet boundary condition
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Martin Almquist <malmquist@stanford.edu>
parents:
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184 case {'D','d','dirichlet','Dirichlet'}
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Martin Almquist <malmquist@stanford.edu>
parents:
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185 closure = -nj*Hi*d{j}*kappa_gamma*H_gamma*(e{j}' );
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Martin Almquist <malmquist@stanford.edu>
parents:
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186 penalty = nj*Hi*d{j}*kappa_gamma*H_gamma;
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parents:
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187
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Martin Almquist <malmquist@stanford.edu>
parents:
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188 % Free boundary condition
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Martin Almquist <malmquist@stanford.edu>
parents:
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189 case {'N','n','neumann','Neumann'}
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190 closure = -nj*Hi*e{j}*kappa_gamma*H_gamma*(d{j}' );
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Martin Almquist <malmquist@stanford.edu>
parents:
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191 penalty = nj*Hi*e{j}*kappa_gamma*H_gamma;
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Martin Almquist <malmquist@stanford.edu>
parents:
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192
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Martin Almquist <malmquist@stanford.edu>
parents:
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193 % Unknown boundary condition
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
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194 otherwise
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
195 error('No such boundary condition: type = %s',type);
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Martin Almquist <malmquist@stanford.edu>
parents:
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196 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
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197 end
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Martin Almquist <malmquist@stanford.edu>
parents:
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198
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Martin Almquist <malmquist@stanford.edu>
parents:
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199 function [closure, penalty] = interface(obj,boundary,neighbour_scheme,neighbour_boundary)
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parents:
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200 % u denotes the solution in the own domain
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Martin Almquist <malmquist@stanford.edu>
parents:
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201 % v denotes the solution in the neighbour domain
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Martin Almquist <malmquist@stanford.edu>
parents:
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202 error('Interface not implemented');
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Martin Almquist <malmquist@stanford.edu>
parents:
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203 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
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204
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Martin Almquist <malmquist@stanford.edu>
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205 % Returns the coordinate number and outward normal component for the boundary specified by the string boundary.
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Martin Almquist <malmquist@stanford.edu>
parents:
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206 function [j, nj] = get_boundary_number(obj, boundary)
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Martin Almquist <malmquist@stanford.edu>
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207
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208 switch boundary
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Martin Almquist <malmquist@stanford.edu>
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209 case {'w','W','west','West', 'e', 'E', 'east', 'East'}
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Martin Almquist <malmquist@stanford.edu>
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210 j = 1;
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211 case {'s','S','south','South', 'n', 'N', 'north', 'North'}
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212 j = 2;
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Martin Almquist <malmquist@stanford.edu>
parents:
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213 otherwise
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Martin Almquist <malmquist@stanford.edu>
parents:
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214 error('No such boundary: boundary = %s',boundary);
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Martin Almquist <malmquist@stanford.edu>
parents:
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215 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
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216
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Martin Almquist <malmquist@stanford.edu>
parents:
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217 switch boundary
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
218 case {'w','W','west','West','s','S','south','South'}
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Martin Almquist <malmquist@stanford.edu>
parents:
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219 nj = -1;
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Martin Almquist <malmquist@stanford.edu>
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220 case {'e', 'E', 'east', 'East','n', 'N', 'north', 'North'}
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Martin Almquist <malmquist@stanford.edu>
parents:
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221 nj = 1;
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
222 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
223 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
224
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
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225 % Returns the coordinate number and outward normal component for the boundary specified by the string boundary.
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Martin Almquist <malmquist@stanford.edu>
parents:
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226 function [return_op] = get_boundary_operator(obj, op, boundary)
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Martin Almquist <malmquist@stanford.edu>
parents:
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227
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
228 switch boundary
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
229 case {'w','W','west','West', 'e', 'E', 'east', 'East'}
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
230 j = 1;
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
231 case {'s','S','south','South', 'n', 'N', 'north', 'North'}
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Martin Almquist <malmquist@stanford.edu>
parents:
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232 j = 2;
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
233 otherwise
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
234 error('No such boundary: boundary = %s',boundary);
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
235 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
236
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
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237 switch op
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
238 case 'e'
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
239 switch boundary
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
240 case {'w','W','west','West','s','S','south','South'}
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
241 return_op = obj.e_l{j};
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
242 case {'e', 'E', 'east', 'East','n', 'N', 'north', 'North'}
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
243 return_op = obj.e_r{j};
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
244 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
245 case 'd'
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
246 switch boundary
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
247 case {'w','W','west','West','s','S','south','South'}
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
248 return_op = obj.d_l{j};
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
249 case {'e', 'E', 'east', 'East','n', 'N', 'north', 'North'}
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
250 return_op = obj.d_r{j};
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
251 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
252 otherwise
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
253 error(['No such operator: operatr = ' op]);
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
254 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
255
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
256 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
257
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
258 function N = size(obj)
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Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
259 N = prod(obj.m);
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
260 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
261 end
eb2f9233acc3 Add scheme Heat2dVariable
Martin Almquist <malmquist@stanford.edu>
parents:
diff changeset
262 end