Wind-US User's Guide - Keyword Reference, ITERATIONS

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ITERATIONS - Set number of iterations per cycle

{ITERATIONS [PER] [CYCLE] | ITER_CYCLE} niters [PRINT [FREQUENCY] freq] \ [zone_selector]

This keyword allows the user to control the number of iterations performed in each zone. The parameter niters specifies the number of iterations per cycle. The default value is 5 for structured grids and 1 for unstructured grids. In addition, niters may have the following special values:

	0		The indicated zone(s) will be bypassed, but the zone coupling will still take place. This is not a good idea as the active zone will update inactive (n = 0) zones, overwriting the existing data. This inactive zone will then pass the active zone's data back to it.
	−1		Perform no iterations in the indicated zone and do not update this zone with adjacent zone information (but do pass this zone's frozen information to other zones each cycle).
	−2		Perform no iterations in the indicated zone and do not update this zone with adjacent zone information (and do not pass this zone's frozen information to other zones).

Residuals will be written to the .lis file every freq iterations, but only for cycles consistent with the PRINT FREQUENCY specified with the CYCLES keyword. The default value for freq is 1.

Note that the print frequency does not affect integrated properties specified using the LOADS keyword block. The print frequency for integrated properties is controlled by the PRINT keyword in the LOADS keyword block.

The zone_selector, if specified, must appear last. The print frequency, however, is global; the value specified on the last ITERATIONS entry in the input data (.dat) file will be used in all zones.

Example

If the user specifies

   CYCLES 1000 PRINT FREQUENCY 10
   ITERATIONS PER CYCLE 10 PRINT FREQUENCY 10

cycle time information will be printed for cycles 1, 11, 21, etc. Residuals will be printed for iterations 10 (in cycle 1), 110 (cycle 11), 210 (cycle 21), etc.

See Also: CYCLES, LOADS, NAVIER-STOKES ITERATIONS, TURBULENCE

Last updated 25 Feb 2009