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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="SNESMS"><H1>SNESMS</H1></A>
multi-stage smoothers
<H3><FONT COLOR="#CC3333">Options Database</FONT></H3>
<P>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_ms_type </B></TD><TD>- type of multi-stage smoother
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_ms_damping </B></TD><TD>- damping for multi-stage method
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
These multistage methods are explicit Runge-Kutta methods that are often used as smoothers for
FAS multigrid for transport problems. In the linear case, these are equivalent to polynomial smoothers (such as Chebyshev).
<P>
Multi-stage smoothers should usually be preconditioned by point-block Jacobi to ensure proper scaling and to normalize the wave speeds.
<P>
The methods are specified in low storage form (Ketcheson 2010). New methods can be registered with <A HREF="../SNES/SNESMSRegister.html#SNESMSRegister">SNESMSRegister</A>().
<P>
<H3><FONT COLOR="#CC3333">References</FONT></H3>
<P>
Ketcheson (2010) Runge-Kutta methods with minimum storage implementations.
<P>
Jameson (1983) Solution of the Euler equations for two dimensional transonic flow by a multigrid method.
<P>
Pierce and Giles (1997) Preconditioned multigrid methods for compressible flow calculations on stretched meshes.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNES/SNESCreate.html#SNESCreate">SNESCreate</A>(), <A HREF="../SNES/SNES.html#SNES">SNES</A>, <A HREF="../SNES/SNESSetType.html#SNESSetType">SNESSetType</A>(), <A HREF="../SNES/SNESMS.html#SNESMS">SNESMS</A>, <A HREF="../SNES/SNESFAS.html#SNESFAS">SNESFAS</A>, <A HREF="../KSP/KSPCHEBYSHEV.html#KSPCHEBYSHEV">KSPCHEBYSHEV</A>
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/impls/ms/ms.c.html#SNESMS">src/snes/impls/ms/ms.c</A>
<BR><A HREF="./index.html">Index of all SNES routines</A>
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