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MARCHING  Parabolized NavierStokes algorithm
Structured Grids
MARCHING [LIMITER value] [CHECKPOINT interval] [COPY]

For structured grids, this keyword enables WindUS's spatial marching,
or parabolized NavierStokes (PNS), algorithm for flowfields which are
supersonic in the computational idirection.
In this mode, WindUS marches from the i = 1 to the
i = i_{max} computational surface, attempting
to compute a steadystate solution at each plane before moving on to the
next one.
Using the PNS algorithm significantly reduces the computing time
required for supersonic solutions.
 LIMITER value 
 This keyword enables the marching limiter, which limits the change
in the solution vector Q to
(value)Q.
I.e.,
ΔQ ≤ (value)Q


 CHECKPOINT interval 
 The parameter interval specifies the number of iplanes
to be computed before writing the current flowfield to the
solution file.
The default is 10.


 COPY 
 This keyword requests that WindUS copy the solution from the
most recently computed iplane to the upcoming iplane,
giving a (hopefully) better initialization to the new iplane
than simply starting from freestream flow.


Notes
 Marching is only available for structured grids.
 Marching is only available when WindUS is run in serial mode.
 Marching requires that one of the following explicit operators be
used. (See the RHS keyword.)
 Coakley (any order)
 Roe (firstorder upwind, secondorder upwind, thirdorder
upwindbiased, firstorder upwind modified for stretched grids,
or secondorder upwindbiased modified for stretched grids)
 Van Leer (firstorder upwind, secondorder upwind, or thirdorder
upwindbiased)
 The Roe secondorder upwindbiased explicit operator modified for
stretched grids uses the i + 1 grid point, which
is invalid in a PNS solution.
When this operator is used, WindUS automatically changes to first
order in the idirection.
See Also: RHS
Last updated 12 May 2012