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Keywords: drag
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Journal Articles
Article Type: Research-Article
J. Offshore Mech. Arct. Eng. May 2013, 135(2): 021803.
Paper No: OMAE-11-1070
Published Online: February 25, 2013
..., the reduced velocity ranges from 1 to 13 and the low damping ratio of the test setup at 0.006 gives a combined mass-damping parameter of 0.02. For the fixed cylinders, the downstream cylinder experiences a drag reduction and it was found that this drag reduction also depends upon the diameter ratio. The lift...
Journal Articles
Article Type: Offshore Technology
J. Offshore Mech. Arct. Eng. February 2012, 134(1): 011303.
Published Online: October 13, 2011
...Lars C. Gansel; Thomas A. McClimans; Dag Myrhaug Experiments were carried out to measure forces on and wake characteristics downstream from fish cages. Cylinders made from metal mesh with porosities of 0%, 30%, 60%, 75%, 82%, and 90% were tested in a towing tank. The drag force was measured...
Journal Articles
Article Type: Technology Review
J. Offshore Mech. Arct. Eng. February 2009, 131(1): 014001.
Published Online: November 10, 2008
...Arash Zakeri Submarine landslides and debris flows are among the most destructive geohazards, economically and environmentally, for installations on the seafloor. Estimating the drag forces caused by these geohazards is an important design consideration in offshore engineering. A summary...
Journal Articles
Article Type: Safety And Reliability
J. Offshore Mech. Arct. Eng. February 2009, 131(1): 011601.
Published Online: October 15, 2008
... mode response of the tether dominates the motion. Nonlinearity in the equation of motion is produced due to the relative velocity squared drag force. In order to trace different branches of the response curve and investigate different instability phenomena that may exist, an arc-length continuation...
Journal Articles
Article Type: Technical Briefs
J. Offshore Mech. Arct. Eng. November 2008, 130(4): 044502.
Published Online: October 1, 2008
... cylinders with a maximum Reynolds number of 77,000. The elastically supported downstream cylinder moves downward and inward toward the centerline of the upstream cylinder’s wake with increasing flow velocity, indicating the presence of a transverse lift force and reduced drag in the wake. These forces can...
Journal Articles
Article Type: Safety And Reliability
J. Offshore Mech. Arct. Eng. November 2008, 130(4): 041601.
Published Online: September 23, 2008
...Arvid Naess; Oleg Gaidai The focus of the present paper is the extreme response statistics of drag dominated offshore structures subjected to harsh weather conditions. More specifically, severe sea states both with and without strong current are considered. The nature of the hydrodynamic forces...
Journal Articles
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. August 2008, 130(3): 031009.
Published Online: July 18, 2008
...Oleg Gaidai; Arvid Naess Fatigue analysis for fixed offshore structures is an important practical issue. These structures are often drag dominated, which makes the deck response a non-Gaussian process when it is assumed that the irregular waves are Gaussian. Incorporating nonlinear and non-Gaussian...
Journal Articles
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. August 2008, 130(3): 031007.
Published Online: July 16, 2008
... of the lines is studied for physical insight. Within this framework, the frequency domain equations are rigorously formulated, and the nonlinearities in the restoring forces and drag are statistically linearized. The model allows key coupling effects to be understood; among other things, the equations...
Journal Articles
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. August 2008, 130(3): 031004.
Published Online: July 15, 2008
..., in addition to the importance of gravitational and inertial forces, the viscosity affects the drag hydrodynamic force, as well. It should be noted that viscosity and consequently drag coefficient in Froude type modeling cannot be quite applicable and this causes the difference observed between the results...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. May 2006, 128(2): 119–132.
Published Online: August 23, 2005
... to the effects of the mobile base, the various hydrodynamic forces exerted on these systems in an underwater environment are also incorporated into the simulation. The effects modeled in this work are added mass, viscous drag, fluid acceleration, and buoyancy forces. For drag forces, the emphasis here...
Journal Articles
Article Type: Article
J. Offshore Mech. Arct. Eng. February 2005, 127(1): 31–38.
Published Online: March 23, 2005
..., it was uncertain whether this type of scattering would be observed in the case of a single column, or whether it results from the transmission of wave modes trapped between the legs of a multiple column structure. In the case of a single column, if the diameter, D, is such that the flow lies within the drag...
Journal Articles
Article Type: Article
J. Offshore Mech. Arct. Eng. February 2005, 127(1): 39–45.
Published Online: March 23, 2005
...Robert D. Blevins, Consultant A model is developed for the steady fluid forces on a cylinder that is in the wake of a parallel, upstream cylinder in cross flow. The fluid forces are determined by correlating experimental data with an asymptotic model of the wake. This allows both lift and drag...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. August 2005, 127(3): 212–219.
Published Online: February 2, 2005
.... This paper describes the test setup, and measurement system for a series of fixed caisson tests and demonstrates the consistency of the test data. The measured inline drag and transverse lift forces on the fixed caisson at different drafts are presented and the effect of the fluid velocity and flow vorticity...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. May 2005, 127(2): 104–111.
Published Online: November 23, 2004
.... The analysis is performed in both model and full scales so that the difference in the results may be investigated. Also, since the model test data are available, comparisons are made between the CFD and model test results on the drag and lift forces on the caisson. Computational domain for the west side...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. August 2003, 125(3): 161–167.
Published Online: July 11, 2003
...Chih Young Liaw; Xiang Yuan Zheng Besides the commonly considered drag force, inundation due to variable water surface is another important nonlinear effect of wave loading. Quadratic and quartic approximations of the inundation drag force are derived using the least squares method. Other nonlinear...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. February 2003, 125(1): 17–24.
Published Online: February 28, 2003
... February 2002 01 September 2002 28 02 2003 offshore installations ocean waves structural engineering drag design engineering kinematics The design of offshore structures in depth-limited steep and breaking waves is particularly important for smaller structural members...
Topics: Waves
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. February 2002, 124(1): 6–13.
Published Online: July 31, 2001
...Mario Di Paola; Giuseppe Failla This study presents a new statistical cubicization approach for predicting the stochastic response of offshore platforms subjected to a Morison-type nonlinear drag loading. Statistics of the original system are obtained from an equivalent nonlinear system, which...
Journal Articles
Article Type: Technical Briefs
J. Offshore Mech. Arct. Eng. May 2001, 123(2): 84–87.
Published Online: December 8, 2000
... coupled with surge, sway, heave, roll, pitch, and yaw motions of the hull. The linear frequency-dependent hydrodynamic response to the hull’s own motions accounted for memory effects that were approximated in the time domain by a finite state space model. The nonlinear hydrodynamic drag force acting...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. February 2001, 123(1): 1–9.
Published Online: November 27, 2000
... . Manuscript received by the OMAE Division, February 11, 2000; revised manuscript received November 27, 2000. Associate Editor: S. Calisal. 11 February 2000 27 November 2000 naval engineering load distribution drag Irrespective of the location of the floating production system...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. May 2000, 122(2): 118–124.
Published Online: December 17, 1999
...Matthew Lake; Haiping He; Armin W. Troesch; Marc Perlin; Krish P. Thiagarajan Research papers at previous OMAE conferences by Thiagarajan and Troesch 4 5 described forced oscillation model tests using a 0.45-m-dia cylinder and a 0.6-m-disk appended to the cylinder base for drag augmentation...