Wind-US User's Guide - Keyword Reference, RELAX COUPLING

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RELAX COUPLING - Set zone coupling relaxation factor

Structured Grids

RELAX {COUPLE | COUPLING} factor \ [ZONE zone_selector [[BOUNDARY] {ALL | I1 | IMAX | J1 | JMAX | K1 | KMAX}]]

This keyword allows the user to specify the relaxation factor when using characteristic zone coupling and structured grids. factor may range from 0.0 for no coupling, to 1.0 for full zone coupling.

Zone and boundary specification for this keyword are optional and subject to the following restrictions:

If the zone specification is omitted, the specified factor will be applied at all boundaries in all zones.
If a zone (or zones) is specified, the ZONE keyword must be used.
If no boundary is specified (or the boundary is specified as BOUNDARY ALL), the specified factor will be applied at all boundaries in the specified zone(s).
A boundary cannot be specified without the zone specification.

The default relaxation factor is 0.7 for steady-state calculations, and 1.0 for for space-marching and time-accurate calculations. If the RELAX COUPLING keyword is used, and all zones are selected (either by omitting the zone specification, or by specifying ZONE ALL), the relaxation factor is automatically set to 1.0 for space-marching and time-accurate calculations. However, if specific zones were selected, the specified factor will be used at the specified boundary in those zones, even for space-marching and time-accurate calculations.

See Also: COUPLING

Last updated 1 Apr 2016