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annotate +time/CdiffTimeDep.m @ 1031:2ef20d00b386 feature/advectionRV

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For easier comparison, return both the first order and residual viscosity when evaluating the residual. Add the first order and residual viscosity to the state of the RungekuttaRV time steppers
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Thu, 17 Jan 2019 10:25:06 +0100
parents 151ab2b5a686
children 8894e9c49e40
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1 classdef CdiffTimeDep < time.Timestepper
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2 properties
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3 D
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4 E
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5 S
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6 k
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7 t
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8 v
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9 v_prev
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10 n
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11 end
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14 methods
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15 % Solves u_tt = Du + E(t)u_t + S(t)
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16 % D, E, S can either all be constants or all be function handles,
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17 % They can also be omitted by setting them equal to the empty matrix.
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18 % CdiffTimeDep(D, E, S, k, t0, n0, v, v_prev)
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19 function obj = CdiffTimeDep(D, E, S, k, t0, n0, v, v_prev)
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20 m = length(v);
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21 default_arg('E', @(t)sparse(m,m));
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22 default_arg('S', @(t)sparse(m,1));
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24 obj.D = D;
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25 obj.E = E;
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26 obj.S = S;
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28 obj.k = k;
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29 obj.t = t0;
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30 obj.n = n0;
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31 obj.v = v;
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32 obj.v_prev = v_prev;
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33 end
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34
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35 function [v,t] = getV(obj)
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36 v = obj.v;
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37 t = obj.t;
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38 end
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40 function [vt,t] = getVt(obj)
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41 vt = (obj.v-obj.v_prev)/obj.k; % Could be improved using u_tt = f(u))
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42 t = obj.t;
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43 end
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45 function obj = step(obj)
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46 [obj.v, obj.v_prev] = time.cdiff.cdiff(obj.v, obj.v_prev, obj.k, obj.D, obj.E(obj.t), obj.S(obj.t));
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47 obj.t = obj.t + obj.k;
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48 obj.n = obj.n + 1;
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49 end
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