Download PROPID User Manual - UIUC Applied Aerodynamics Group

negative number. The value has been forced to a small number in an
attempt to continue and find a converged solution inside prop.f.
940,941,942,943,944: (report.f)
945: This mode is not implement in bemtval called w/ REPORT_BE_DATA line.
950: LSAF will only accept up to 24 segments.
to be pruned to a smaller number of segments.
The LSAF file will need
956: The angle of attack correction computed by the Corrigan model can
sometimes be negative. This will produce a decrease in cl rather than
an increase in cl. When a negative value is computed, the correction
is forced to zero, hence no correction is made in this
case. (corgan.f) A similar routine has been added to dudelta.f.
957: (Selig - see menu.f)
990: Requesting airfoil data and the Reynolds number for a station is
zero. If this is the root section (jseg = 1), then this is not a
problem. It should not happen otherwise.
999: This line type is not in the PROPID (menu.f).
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Errors:
1010: PROPID has not been checked to work in propeller mode.
probably will not work correctly.
It
1020: The prop.f code did not converge to a proper solution, and this
can likely be seen in the cl or axial induction factor distribution
for the segment noted in the screen dump regarding the error. The
solution is to use the RELAXF line with a factor less than 1. With a
factor less than 1 (suggested 0.6), relaxation will be applied to the
value dct used in the iteration loop for a blade segment. The smaller
the relaxf value, the more iterations and longer the run times. The
only advantage to using this factor, is to get a solution, it does not
speed up the solution or create a better solution. If no Error 1020
message is given, then the solution has converged. This error is
likely only to appear with running in TIPMODE 2 (Prandtl model only,
as opposed to the Wilson-Prandtl model - a modified Prandtl model and
not as accurate).
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