Mercurial > repos > public > sbplib
annotate +scheme/Schrodinger1dCurve.m @ 495:b91d23271481 feature/quantumTriangles
Added new penalty parameter to the interface in shrodinger curve
author | Ylva Rydin <ylva.rydin@telia.com> |
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date | Fri, 24 Feb 2017 09:04:02 +0100 |
parents | 6b8297f66c91 |
children | 437fad4a47e1 |
rev | line source |
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1 classdef Schrodinger1dCurve < scheme.Scheme |
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2 properties |
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3 m % Number of points in each direction, possibly a vector |
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4 h % Grid spacing |
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5 xi % Grid |
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6 order % Order accuracy for the approximation |
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7 grid |
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8 |
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9 D % non-stabalized scheme operator |
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10 H % Discrete norm |
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11 M % Derivative norm |
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12 alpha |
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13 |
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14 V_mat |
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15 D1 |
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16 D2 |
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17 Hi |
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18 e_l |
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19 e_r |
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20 d1_l |
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21 d1_r |
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22 gamm |
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23 end |
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24 |
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25 methods |
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26 % Solving SE in the form u_t = i*u_xx +i*V on deforming 1D domain; |
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27 function obj = Schrodinger1dCurve(g,m,order,V,constJi) |
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28 default_arg('V',0); |
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29 default_arg('constJi',false) |
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30 xilim={0 1}; |
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31 if constJi |
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32 ops = sbp.D2Standard(m,xilim,order); |
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33 else |
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34 ops = sbp.D4Variable(m,xilim,order); |
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35 end |
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36 |
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37 obj.xi=ops.x; |
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38 obj.h=ops.h; |
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39 obj.D2 = ops.D2; |
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40 obj.D1 = ops.D1; |
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41 obj.H = ops.H; |
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42 obj.Hi = ops.HI; |
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43 obj.M = ops.M; |
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44 obj.e_l = ops.e_l; |
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45 obj.e_r = ops.e_r; |
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46 obj.d1_l = ops.d1_l; |
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47 obj.d1_r = ops.d1_r; |
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48 obj.grid = g; |
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49 |
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50 |
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51 if isa(V,'function_handle') |
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52 V_vec = V(obj.x); |
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53 else |
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54 V_vec = obj.xi*0 + V; |
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55 end |
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56 |
430 | 57 obj.V_mat = spdiags(V_vec,0,m,m); |
58 obj.D = @(a,a_xi,Ji) obj.d_fun(a, a_xi, Ji, constJi); | |
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59 obj.m = m; |
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60 obj.order = order; |
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61 end |
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62 |
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63 |
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64 % Closure functions return the opertors appliedo to the own doamin to close the boundary |
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65 % Penalty functions return the opertors to force the solution. In the case of an interface it returns the operator applied to the other doamin. |
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66 % boundary is a string specifying the boundary e.g. 'l','r' or 'e','w','n','s'. |
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67 % type is a string specifying the type of boundary condition if there are several. |
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68 % data is a function returning the data that should be applied at the boundary. |
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69 % neighbour_scheme is an instance of Scheme that should be interfaced to. |
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70 % neighbour_boundary is a string specifying which boundary to interface to. |
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71 |
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72 function [D] = d_fun(obj,a, a_xi , Ji , constJi) |
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73 if constJi |
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74 D= -0.5*(obj.D1*a - a_xi + a*obj.D1) + 1i*Ji*obj.D2 + 1i*obj.V_mat; |
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75 else |
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76 D= -0.5*(obj.D1*a - a_xi + a*obj.D1) + 1i*obj.D2(diag(Ji)) + 1i*obj.V_mat; |
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77 end |
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78 end |
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79 |
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80 function [closure, penalty] = boundary_condition(obj,boundary,type,data) |
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81 default_arg('type','dirichlet'); |
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82 default_arg('data',0); |
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83 |
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84 [e,d,s,p] = obj.get_boundary_ops(boundary); |
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85 |
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86 switch type |
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87 % Dirichlet boundary condition |
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88 case {'D','d','dirichlet'} |
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89 tau1 = s * 1i*d; |
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90 tau2 = @(a) (-1*s*a(p,p) - abs(a(p,p)))/4*e; |
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91 closure = @(a) obj.Hi*tau1*e' + obj.Hi*tau2(a)*e'; |
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92 |
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93 switch class(data) |
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94 case 'double' |
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95 penalty = @(a) -(obj.Hi*tau1*data+obj.Hi*tau2(a)*data); |
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96 % case 'function_handle' |
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97 % penalty = @(t)-obj.Hi*tau*data(t); |
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98 otherwise |
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99 error('Wierd data argument!') |
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100 end |
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101 |
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102 % Unknown, boundary condition |
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103 otherwise |
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104 error('No such boundary condition: type = %s',type); |
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105 end |
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106 end |
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107 |
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108 function [closure, penalty] = interface(obj,boundary,neighbour_scheme,neighbour_boundary) |
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109 % u denotes the solution in the own domain |
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110 % v denotes the solution in the neighbour domain |
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111 [e_u,d_u,s_u,p_u] = obj.get_boundary_ops(boundary); |
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112 [e_v,d_v,s_v,p_v] = neighbour_scheme.get_boundary_ops(neighbour_boundary); |
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113 |
495
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114 a1 = -s_u* 1/2 * 1i ; |
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115 b1 = a1'; |
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116 gamma = -1*s*a(p_u,p_u)/2; |
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117 |
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118 tau = b1*d_u; |
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119 sig = -a1*e_u; |
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120 |
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121 closure = @(a) obj.Hi * (tau*e_u' + sig*d_u' + gamma(a)); |
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122 penalty = @(a) obj.Hi * (-tau*e_v' - sig*d_v' - gamma(a)); |
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123 end |
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124 |
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125 % Ruturns the boundary ops and sign for the boundary specified by the string boundary. |
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126 % The right boundary is considered the positive boundary |
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127 function [e,d,s,p] = get_boundary_ops(obj,boundary) |
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128 switch boundary |
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129 case 'l' |
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130 e = obj.e_l; |
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131 d = obj.d1_l; |
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132 s = -1; |
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133 p=1; |
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134 case 'r' |
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135 e = obj.e_r; |
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136 d = obj.d1_r; |
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137 s = 1; |
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138 p=obj.m; |
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139 otherwise |
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140 error('No such boundary: boundary = %s',boundary); |
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141 end |
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142 end |
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143 |
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144 function N = size(obj) |
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145 N = obj.m; |
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146 end |
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147 |
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148 end |
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149 |
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150 methods(Static) |
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151 % Calculates the matrcis need for the inteface coupling between boundary bound_u of scheme schm_u |
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152 % and bound_v of scheme schm_v. |
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153 % [uu, uv, vv, vu] = inteface_couplong(A,'r',B,'l') |
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154 function [uu, uv, vv, vu] = interface_coupling(schm_u,bound_u,schm_v,bound_v) |
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155 [uu,uv] = schm_u.interface(bound_u,schm_v,bound_v); |
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156 [vv,vu] = schm_v.interface(bound_v,schm_u,bound_u); |
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157 end |
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158 end |
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159 end |