Frequency domain analysis of in-line forces on circular cylinders in random oscillatory flow. [Dynamic load estimation for offshore platforms]
- Univ. of Texas, Austin, TX (United States). College of Engineering
Experiments were conducted to study random hydrodynamic loading of smooth, rigidly mounted circular cylinders exposed to random oscillatory flow conditions. The experiments were conducted in a water tunnel for statistical Keulegan-Carpenter numbers ranging from KC[sub r] = 6.8 to 11.6 and statistical Reynold's numbers from Re[sub r] = 8,211 to 20,169 under broad and narrow-band flow conditions. A two-input/single-output frequency domain model for the in-line force is used to directly identify frequency-dependent inertia and drag coefficients. This model was also used to show the relative strength of the inertia and drag components in the frequency domain for different random flow conditions parameterized by KC[sub r], Re[sub r] and the velocity spectral width, q. This analysis illustrates the effect of statistical flow parameters (KC[sub r], Re[sub r] and q) on the nonlinear behavior of the in-line forces. Estimates of the in-line force power spectral density under random flow conditions are determined using the two-input/single-output model and compared to the method for estimating wave forces on a cylindrical structure by Borgman (1967, 1972).
- OSTI ID:
- 5965456
- Journal Information:
- Journal of Offshore Mechanics and Arctic Engineering; (United States), Journal Name: Journal of Offshore Mechanics and Arctic Engineering; (United States) Vol. 115:1; ISSN 0892-7219; ISSN JMOEEX
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
423000* -- Engineering-- Marine Engineering-- (1980-)
BENCH-SCALE EXPERIMENTS
CALCULATION METHODS
DYNAMIC LOADS
ENGINEERING
FLUID MECHANICS
FUNCTIONS
GRAVITY WAVES
HYDRODYNAMICS
MECHANICS
OFFSHORE PLATFORMS
OFFSHORE SITES
PROBABILISTIC ESTIMATION
RESPONSE FUNCTIONS
REYNOLDS NUMBER
SAFETY ENGINEERING
WATER WAVES
WAVE FORCES