ssc-367 - Ship Structure Committee

CLO = base lift coefficient = 0.29 high Reynolds number
= 0.42 low Reynolds number
CLj = design lift coefficient = CLO X farX 10 X+ x 1.2
f ar =
turbulence parameter = 1.0
~=
turbulence parameter = 1.0
10 = turbulence parameter = 0.45
Evaluating the equation based on the high Reynolds number (Re >
500,000) leads to:
nN = 0.0795 (0.29 )(1.0 )(0.45 )(1.0 )(1.2 )/[ K~(0.2)2]
or
ON =
~ (high Reynolds number, Re > 500,000)
s
0.4510
~N ‘~
(low Reynolds number, Re < 500,000)
The amplitude can also be determined iteratively by utilizing the
ESDU recommended turbulence parameter and following steps 1 through
5.
Step 1: Determine correlation length factor, l.. Depending cm the
end fixity, 10
is:
10 = 0.66 for fixed and free (cantilever)
= 0.63 for pin and pin (simple beam)
= 0.58 for fixed and pin
= 0.52 for fixed and fixed
step 2: Assume 1/10 = 1.0 and calculate the amplitude.
D-12