LStableDirk4

Fourth-order diagonally implicit Runge Kutta method (Dirk) with five stages.

This method can be expressed as a Runge-Kutta method with the following Butcher Tableau:

var element = document.getElementById("moose-equation-2f93a195-953b-46fd-8847-a219ba4a9cbe");katex.render("\\begin{array}{c|ccccc} \\alpha & \\alpha\\\\ 1/4 & 1/4 \\\\ 0 & -1/4 & 1/4 \\\\ 1/2 & 1/8 & 1/8 & 1/4 \\\\ 1 & -3/2 & 3/4 & 3/2 & 1/4 \\\\ 1 & 0 & 1/6 & 2/3 & -1/12 & 1/4 \\\\ \\hline & 0 & 1/6 & 2/3 & -1/12 & 1/4 \\\\ \\end{array}", element, {displayMode:true,throwOnError:false});

The stability function for this method is:

var element = document.getElementById("moose-equation-31a8551a-896f-4530-80d8-f6eb5ecada88");katex.render("R(z) = -\\dfrac{28 z^4 + 32 z^3 - 384 z^2 - 768 z + 3072}{ 3 z^5 - 60 z^4 + 480 z^3 - 1920 z^2 + 3840 z - 3072}", element, {displayMode:true,throwOnError:false});

The method is L-stable:

var element = document.getElementById("moose-equation-7e522ba4-d6f6-4343-b890-3025a707b745");katex.render("\\lim_{z->\\infty} R(z) = 0", element, {displayMode:true,throwOnError:false});

Notes

The method was found in Skvortsov (2006) but it may not be the original source. There is also a 4th-order rule with 5 stages on page 107 of Hairer and Wanner (1999) but its coefficients have less favorable "amplification factors" than the present rule.

Input Parameters

variablesA subset of the variables that this time integrator should be applied to
C++ Type:std::vector<VariableName>
Unit:(no unit assumed)
Controllable:No
Description:A subset of the variables that this time integrator should be applied to

Optional Parameters

control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Set the enabled status of the MooseObject.

Advanced Parameters

References

E. Hairer and G. Wanner. Vol. 2: Stiff and Differential-Algebraic Problems : Solving Ordinary Differential Equations. Volume 2. Springer, Berlin, 1999.

@book{hairer1999,
    author = "Hairer, E. and Wanner, G.",
    title = "Vol. 2: Stiff and Differential-Algebraic Problems : Solving Ordinary Differential Equations",
    volume = "2",
    year = "1999",
    publisher = "Springer, Berlin"
}

L. M. Skvortsov. Diagonally implicit runge-kutta methods for stiff problems. Computational Mathematics and Mathematical Physics, 46(12):2110–2123, 2006.

@article{skvortsov2006,
    author = "Skvortsov, L. M.",
    title = "Diagonally implicit Runge-Kutta Methods for Stiff Problems",
    journal = "Computational Mathematics and Mathematical Physics",
    volume = "46",
    number = "12",
    pages = "2110-2123",
    year = "2006"
}

Notes
Input Parameters
References