Update: check time dependence with the number of chemical species

examples/check_time_dependence_species.m

@@ -0,0 +1,74 @@
+% -------------------------------------------------------------------------
+% Check time dependence with number of chemical species
+%
+% @author: Alberto Cuadra Lara
+%          Postdoctoral researcher - Group Fluid Mechanics
+%          Universidad Carlos III de Madrid
+%                 
+% Last update Feb 08 2024
+% -------------------------------------------------------------------------
+
+% Definitions
+nfrec = 10;
+NS_min = 7;
+phi = 0.5:0.1:2;
+
+% Get list of species
+self = App;
+LS = find_products(self, {'C', 'H', 'O', 'N'}, 'flag_burcat', true);
+LS = unique(['CO2', 'CO', 'H2O', 'H2', 'O2', 'N2', 'Cbgrb', LS], 'stable');
+
+% Preallocation
+NS = NS_min:nfrec:length(LS);
+time = zeros(size(NS));
+id = 0;
+
+for i = NS_min:nfrec:length(LS)
+    % Update
+    id = id + 1;
+
+    % Initialization
+    self = App(LS(1:i));
+
+    % Set initial state
+    self = set_prop(self, 'TR', 300, 'pR', 1, 'phi', phi);
+    self.PD.S_Fuel     = {'CH4'};
+    self.PD.S_Oxidizer = {'N2', 'O2'};
+    self.PD.ratio_oxidizers_O2 = [79, 21] / 21;
+
+    % Define additiational constrains (depends of the problem selected)
+    self = set_prop(self, 'pP', self.PD.pR.value);
+
+    % Tunning properties
+    self.TN.tolN = 1e-14;
+    self.TN.tol0 = 1e-4;
+
+    % Solve problem
+    t0 = tic;
+    self = solve_problem(self, 'HP');
+    time(id) = toc(t0);
+end
+
+time_per_case = time / length(phi);
+
+% Least squares interpolation
+[xData, yData] = prepareCurveData( NS, time_per_case );
+
+% Set up fittype and options.
+ft = fittype( 'poly1' );
+excludedPoints = xData < 1;
+opts = fitoptions( 'Method', 'LinearLeastSquares' );
+opts.Exclude = excludedPoints;
+
+% Fit model to data.
+[fitresult, gof] = fit( xData, yData, ft, opts );
+
+% Plot fit with data.
+ax = set_figure;
+h = plot( ax, fitresult, xData, yData, excludedPoints );
+legend( h, 'Data', 'Least squares interpolation', 'Location', 'NorthEast', 'Interpreter', 'latex' );
+
+% Label axes
+xlabel( 'Number chemical species', 'Interpreter', 'latex' );
+ylabel( 'Time per case', 'Interpreter', 'latex' );
+grid on