D-R-A-F-T
TT CARD: Crank-Nicholson Theta
Required
Card Description: Used to specify a value for THETA in the Crank-Nicholson
time-stepping scheme.
Field
Variable
Value Description
0, C 1-2
IC1
TT
Card group identifier.
0,C3
IC3
b/
1
TETA
Crank-Nicholson THETA
>0
A value between zero and one (0.66 is
recommended)
≤0
Default = 0.5 This produces the most sensitive
model response but often causes oscillations in
the solution.
.
NOTE: A value of 0.66 is recommended, but variations from 0.5 (equal
weighting of this time - step and the previous time - step) to l.0 (no influence from
the previous time - step) are permitted. A higher value of Theta produces results that
are more stable but numerical (artificial) dispersion of sediment is increased.
128 Run Control TT Card
Users Guide To SED2D-WES
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