Changes between Version 3 and Version 4 of doc/tec/rk3


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Timestamp:
Jan 7, 2011 5:21:26 PM (14 years ago)
Author:
suehring
Comment:

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  • doc/tec/rk3

    v3 v4  
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    2929
    30 For the implementation it is advantageous to compute ψ^N^ from the intermediate solutions ψ^1^ and ψ^2^ as follows:
     30For the implementation it is advantageous to compute ψ^N^ from the intermediate solutions ψ^1^ and ψ^2^ and combine the local tendencies in one array to save storage (therefor low-storage scheme) as follows:
     31{{{
     32#!Latex
     33\[ \hat\psi_{1} & = & \psi_{n} + \frac{1}{3} \Delta t f\left(\psi_{n}\right) \]
     34\[ \hat\psi_{2} & = & \hat\psi_{1} + \frac{1}{48} \Delta t \left( 45 f\left(\hat\psi_1\right) - 25 f\left(\psi_{n}\right) \]
     35f\left(\hat\psi_{1}\right) & = &-153 f\left(\hat\psi_{1}\right) + 85 f\left(\psi_{n}\right) \]
     36\[ \hat\psi_{3} & = & \left( \psi_{n+1} \right) = \hat\psi_{2} + \frac{1}{240} \Delta t \left( 128 f\left(\hat\psi_2\right) + 16 \left(\hat\psi_{1}\right) \]
     37}}}
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