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annotate +rv/ResidualViscosity.m @ 1016:4b42999874c0 feature/advectionRV

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Add lower level for boot-strapping to RungeKuttaExteriorRV - Add a lower level to RungeKuttaExteriorRV for which bootstrapping starts, e.g start bootstrapping from time level 3 using a 3rd order BDF - Clean up ResidualViscosity
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Fri, 07 Dec 2018 13:11:53 +0100
parents 9b7fcd5e4480
children 2d7c1333bd6c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 classdef ResidualViscosity < handle
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2 properties
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3 D % Diff op approximating the gradient of the flux f(u)
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4 waveSpeed % Wave speed at each grid point, e.g f'(u). %TBD: Better naming?
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5 Cmax % Constant controlling relative amount of upwind dissipation
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6 Cres % Constant controling relative amount of upwind dissipation
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7 h % Length scale used for scaling the viscosity. Typically grid spacing.
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8 viscosity % Stores the computed viscosity.
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9 normalization % Function used to normalize the residual such that it is amplified in the
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10 % shocks.
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12 % Convenice (for verification and plotting) TBD: Decide on if it should be kept.
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13 u_t % Stores the latest approximated time derivative of the solution.
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14 grad_f % Stores the latest approximated gradient of the flux
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15 residual % Stores the computed residual
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16 end
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18 methods
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19 % TBD: Decide on how to treat waveSpeed. It would be nice to just pass a constant value without
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20 % wrapping it in a function.
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21 function obj = ResidualViscosity(D, waveSpeed, Cmax, Cres, h, N, normalization)
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22 default_arg('normalization',@(v)norm(v-mean(v),inf));
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23 obj.D = D;
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24 obj.waveSpeed = waveSpeed;
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25 obj.h = h;
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26 obj.Cmax = Cmax;
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27 obj.Cres = Cres;
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28 obj.viscosity = zeros(N,1);
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29 obj.u_t = zeros(N,1);
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30 obj.grad_f = zeros(N,1);
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31 obj.residual = zeros(N,1);
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32 obj.normalization = normalization;
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33 end
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35 function obj = update(obj, v, dvdt)
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36 obj.u_t = dvdt;
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37 obj.grad_f = obj.D(v);
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38 obj.residual = obj.u_t + obj.grad_f;
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39 obj.viscosity = min(obj.Cmax*obj.h*abs(obj.waveSpeed(v)), obj.Cres*obj.h^2*abs(obj.residual)/obj.normalization(v));
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40 end
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41
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42 function [residual, u_t, grad_f] = getResidual(obj)
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43 residual = obj.residual;
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44 u_t = obj.u_t;
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45 grad_f = obj.grad_f;
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46 end
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48 function viscosity = getViscosity(obj)
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49 viscosity = obj.viscosity;
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50 end
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51 end
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52 end