1 | #*------------------------------------------------------------------- |
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2 | * EMSO Model Library (EML) Copyright (C) 2004 - 2007 ALSOC. |
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3 | * |
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4 | * This LIBRARY is free software; you can distribute it and/or modify |
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5 | * it under the therms of the ALSOC FREE LICENSE as available at |
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6 | * http://www.enq.ufrgs.br/alsoc. |
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7 | * |
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8 | * EMSO Copyright (C) 2004 - 2007 ALSOC, original code |
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9 | * from http://www.rps.eng.br Copyright (C) 2002-2004. |
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10 | * All rights reserved. |
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11 | * |
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12 | * EMSO is distributed under the therms of the ALSOC LICENSE as |
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13 | * available at http://www.enq.ufrgs.br/alsoc. |
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14 | * |
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15 | *-------------------------------------------------------------------- |
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16 | * FlowSheet showing how to use the 'if' conditional. |
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17 | * Ref: K.M. Moudgalya & V. Ryali (2001). Chemical Engineering Science |
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18 | * v.56, n.11, pp.3595-3609 |
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19 | *-------------------------------------------------------------------- |
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20 | * Author: Arge |
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21 | * $Id: $ |
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22 | *--------------------------------------------------------------------*# |
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23 | |
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24 | using "types"; |
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25 | |
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26 | Model GasLiquid |
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27 | PARAMETERS |
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28 | kgx as positive (Unit = 'mol/atm/s'); |
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29 | klx as positive (Unit = 'mol/atm/s'); |
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30 | R as positive (Default = 0.082, Unit = 'atm * l / (mol * K)'); |
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31 | T as temperature; |
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32 | Po as pressure; |
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33 | Vd as volume (DisplayUnit = 'l'); |
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34 | V as volume (DisplayUnit = 'l'); |
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35 | roL as dens_mol (DisplayUnit = 'mol/l'); |
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36 | |
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37 | VARIABLES |
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38 | Mg as mol (DisplayUnit = 'mol'); |
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39 | Ml as mol (DisplayUnit = 'mol'); |
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40 | Fg as flow_mol (DisplayUnit = 'mol/s'); |
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41 | Fl as flow_mol (DisplayUnit = 'mol/s'); |
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42 | P as pressure; |
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43 | |
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44 | EQUATIONS |
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45 | P = Mg * R * T / (V - Ml/roL); |
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46 | |
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47 | if Ml > Vd * roL then |
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48 | diff(Mg) = Fg; |
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49 | diff(Ml) = Fl - klx * (P - Po); |
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50 | else |
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51 | diff(Mg) = Fg - kgx * (P - Po); |
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52 | diff(Ml) = Fl; |
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53 | end |
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54 | |
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55 | SET |
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56 | roL = 50 * 'mol/l'; |
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57 | V = 10 * 'l'; |
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58 | Vd = 5 * 'l'; |
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59 | T = 300 * 'K'; |
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60 | Po = 1 * 'atm'; |
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61 | kgx = 0.1 * 'mol/atm/s'; |
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62 | klx = 0.1 * 'mol/atm/s'; |
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63 | end |
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64 | |
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65 | |
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66 | FlowSheet GasLiq1 as GasLiquid |
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67 | |
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68 | SPECIFY |
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69 | Fg = 0.1 * 'mol/s'; |
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70 | Fl = 2.5 * 'mol/s'; |
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71 | |
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72 | INITIAL |
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73 | P = 3.5 * 'atm'; |
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74 | Ml = 245 * 'mol'; |
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75 | |
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76 | OPTIONS |
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77 | # TimeStep = 100; # for statistical purpose (Detailed Output) |
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78 | TimeStep = 1; # for graphical purpose |
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79 | TimeEnd = 100; |
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80 | TimeUnit = 's'; |
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81 | DAESolver (File = "dasslc", |
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82 | RelativeAccuracy = 1e-4, |
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83 | AbsoluteAccuracy = 1e-6); |
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84 | end |
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85 | |
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86 | |
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87 | FlowSheet GasLiq2 as GasLiquid |
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88 | |
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89 | SPECIFY |
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90 | Fg = 2.0 * 'mol/s'; |
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91 | Fl = 1.0 * 'mol/s'; |
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92 | |
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93 | INITIAL |
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94 | P = 1.0 * 'atm'; |
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95 | Ml = 249 * 'mol'; |
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96 | |
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97 | OPTIONS |
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98 | # TimeStep = 10; # for statistical purpose (Detailed Output) |
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99 | TimeStep = 0.1; # for graphical purpose |
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100 | TimeEnd = 10; |
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101 | TimeUnit = 's'; |
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102 | DAESolver (File = "dasslc", |
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103 | RelativeAccuracy = 1e-4, |
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104 | AbsoluteAccuracy = 1e-6); |
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105 | end |
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106 | |
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107 | |
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108 | Model GasLiquid_reg |
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109 | PARAMETERS |
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110 | kgx as positive (Unit = 'mol/atm/s'); |
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111 | klx as positive (Unit = 'mol/atm/s'); |
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112 | R as positive (Default = 0.082, Unit = 'atm * l / (mol * K)'); |
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113 | T as temperature; |
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114 | Po as pressure; |
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115 | Vd as volume (DisplayUnit = 'l'); |
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116 | V as volume (DisplayUnit = 'l'); |
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117 | roL as dens_mol (DisplayUnit = 'mol/l'); |
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118 | eps as Real (Default=1e-5); |
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119 | |
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120 | VARIABLES |
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121 | Mg as mol (DisplayUnit = 'mol'); |
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122 | Ml as mol (DisplayUnit = 'mol'); |
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123 | Fg as flow_mol (DisplayUnit = 'mol/s'); |
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124 | Fl as flow_mol (DisplayUnit = 'mol/s'); |
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125 | P as pressure; |
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126 | n as Real; |
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127 | |
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128 | EQUATIONS |
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129 | P = Mg * R * T / (V - Ml/roL); |
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130 | |
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131 | n = 0.5 * (1 + tanh((Ml/(Vd * roL)-1)/eps)); # regularization function |
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132 | # n = 0.5 * (1+((Ml/(Vd * roL)-1)/eps)/(sqrt(1+((Ml/(Vd * roL)-1)/eps)^2))); # regularization function |
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133 | |
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134 | diff(Mg) = Fg - kgx * (P - Po)*(1-n); |
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135 | diff(Ml) = Fl - klx * (P - Po)*n; |
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136 | |
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137 | SET |
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138 | roL = 50 * 'mol/l'; |
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139 | V = 10 * 'l'; |
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140 | Vd = 5 * 'l'; |
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141 | T = 300 * 'K'; |
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142 | Po = 1 * 'atm'; |
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143 | kgx = 0.1 * 'mol/atm/s'; |
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144 | klx = 0.1 * 'mol/atm/s'; |
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145 | end |
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146 | |
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147 | FlowSheet GasLiq1_reg as GasLiquid_reg |
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148 | |
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149 | SPECIFY |
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150 | Fg = 0.1 * 'mol/s'; |
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151 | Fl = 2.5 * 'mol/s'; |
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152 | |
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153 | INITIAL |
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154 | P = 3.5 * 'atm'; |
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155 | Ml = 245 * 'mol'; |
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156 | |
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157 | OPTIONS |
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158 | # TimeStep = 100; # for statistical purpose (Detailed Output) |
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159 | TimeStep = 1; # for graphical purpose |
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160 | TimeEnd = 100; |
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161 | TimeUnit = 's'; |
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162 | DAESolver (File = "dasslc", |
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163 | RelativeAccuracy = 1e-4, |
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164 | AbsoluteAccuracy = 1e-6); |
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165 | end |
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166 | |
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167 | |
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168 | FlowSheet GasLiq2_reg as GasLiquid_reg |
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169 | |
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170 | SPECIFY |
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171 | Fg = 2.0 * 'mol/s'; |
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172 | Fl = 1.0 * 'mol/s'; |
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173 | |
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174 | INITIAL |
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175 | P = 1.0 * 'atm'; |
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176 | Ml = 249 * 'mol'; |
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177 | |
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178 | OPTIONS |
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179 | # TimeStep = 10; # for statistical purpose (Detailed Output) |
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180 | TimeStep = 0.1; # for graphical purpose |
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181 | TimeEnd = 10; |
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182 | TimeUnit = 's'; |
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183 | DAESolver (File = "dasslc", |
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184 | RelativeAccuracy = 1e-4, |
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185 | AbsoluteAccuracy = 1e-6); |
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186 | end |
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