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annotate alignedTimestep.m @ 1015:9b7fcd5e4480 feature/advectionRV

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Debug ResidualViscosity - Pass exact time derivative to RungeKuttaExteriorRV and use that for evaluating the residual - Start bootstrapping from later time level with higher order bdf
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Thu, 06 Dec 2018 17:03:22 +0100
parents c71095442c57
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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12
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
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1 % Calcualtes the largest timestep smaller than k_max that gives an integer
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
2 % number of timesteps to time T.
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
3 % k_max -- largest allowable timestep
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
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4 % T -- time to align with
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
5 %
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
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6 % Returns:
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
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7 % k -- calculated timestep
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
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8 % N -- number to of timestep to reach T
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
9 function [k, N] = alignedTimestep(k_max, T)
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
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10 N = ceil(T/k_max);
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
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11 k = T/N;
c71095442c57 Added function to calculate an aligned timestep.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
12 end