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MARCHING - Parabolized Navier-Stokes algorithm
MARCHING [LIMITER value] [CHECKPOINT interval] [COPY]
For structured grids, this keyword enables Wind-US's spatial marching,
or parabolized Navier-Stokes (PNS), algorithm for flowfields which are
supersonic in the computational i-direction.
In this mode, Wind-US marches from the i = 1 to the
i = imax computational surface, attempting
to compute a steady-state solution at each plane before moving on to the
Using the PNS algorithm significantly reduces the computing time
required for supersonic solutions.
||This keyword enables the marching limiter, which limits the change
in the solution vector Q to
ΔQ ≤ (value)Q
||The parameter interval specifies the number of i-planes
to be computed before writing the current flowfield to the
The default is 10.
||This keyword requests that Wind-US copy the solution from the
most recently computed i-plane to the upcoming i-plane,
giving a (hopefully) better initialization to the new i-plane
than simply starting from freestream flow.
- Marching is only available for structured grids.
- Marching is only available when Wind-US is run in serial mode.
- Marching requires that one of the following explicit operators be
used. (See the RHS keyword.)
- Coakley (any order)
- Roe (first-order upwind, second-order upwind, third-order
upwind-biased, first-order upwind modified for stretched grids,
or second-order upwind-biased modified for stretched grids)
- Van Leer (first-order upwind, second-order upwind, or third-order
- The Roe second-order upwind-biased explicit operator modified for
stretched grids uses the i + 1 grid point, which
is invalid in a PNS solution.
When this operator is used, Wind-US automatically changes to first
order in the i-direction.
See Also: RHS
Last updated 12 May 2012