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annotate +rv/+time/RungekuttaExteriorRv.m @ 1223:9fddc8749445 rv_diffOp_test

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Closing branch
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Mon, 05 Aug 2019 10:48:37 +0200
parents 010bb2677230
children 3108963cc42c
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78c75c95b7dd Rename Rungekutta-Rv classes according to naming convention
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1 classdef RungekuttaExteriorRv < time.Timestepper
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2 properties
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3 F % RHS of the ODE
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4 k % Time step
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5 t % Time point
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6 v % Solution vector
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7 n % Time level
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8 coeffs % The coefficents used for the RK time integration
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9 RV % Residual Viscosity operator
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10 DvDt % Function for computing the time deriative used for the RV evaluation
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11 end
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12 methods
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13
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14 function obj = RungekuttaExteriorRv(F, k, t0, v0, RV, DvDt, order)
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15 obj.F = F;
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16 obj.k = k;
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17 obj.t = t0;
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18 obj.v = v0;
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19 obj.n = 0;
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20 % Extract the coefficients for the specified order
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21 % used for the RK updates from the Butcher tableua.
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22 [s,a,b,c] = time.rk.butcherTableau(order);
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23 obj.coeffs = struct('s',s,'a',a,'b',b,'c',c);
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25 obj.RV = RV;
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26 obj.DvDt = DvDt;
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27 end
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29 function [v, t] = getV(obj)
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30 v = obj.v;
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31 t = obj.t;
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32 end
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34 function state = getState(obj)
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35 dvdt = obj.DvDt(obj.v);
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36 [viscosity, Df, firstOrderViscosity, residualViscosity] = obj.RV.evaluate(obj.v, dvdt);
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37 state = struct('v', obj.v, 'dvdt', dvdt, 'Df', Df, 'viscosity', viscosity, 'residualViscosity', residualViscosity, 'firstOrderViscosity', firstOrderViscosity, 't', obj.t);
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38 end
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39
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40 % Advances the solution vector one time step using the Runge-Kutta method given by
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41 % obj.coeffs, using a fixed residual viscosity for the Runge-Kutta substeps
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dce08a74e0ad Create a separate class of RungekuttaExteriorRV which uses BDFs for computing the time derivative. Remove BDFs from RungekuttaExteriorRV
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42 function obj = step(obj)
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43 % Fix the viscosity of the RHS function F
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44 F_visc = @(v,t) obj.F(v,t,obj.RV.evaluateViscosity(obj.v, obj.DvDt(obj.v)));
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45 obj.v = time.rk.rungekutta(obj.v, obj.t, obj.k, F_visc, obj.coeffs);
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46 obj.t = obj.t + obj.k;
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47 obj.n = obj.n + 1;
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48 end
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49 end
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50 end