... to remove the LLM, using local time averaging in the wall model, was suggested as an alternative to velocity sampling further away from the wall. For ship hydrodynamics, the modeling of the transition from laminar to TBL must also be considered for simulations including the complete hull. Transitionmodeling...

...Dongyoung Kim; Yagin Kim; Jiajia Li; Robert V. Wilson; J. Ezequiel Martin; Pablo M. Carrica We describe the implementation of several recently developed boundary layer transition models into the overset computational fluid dynamics code, REX, developed at the University of Iowa, together...

...Lars-Uve Schrader The resistance of ships is often dominated by friction between the hull and the water. This study explores possibilities of reducing skin-friction drag in a way inspired by dolphins. These possess a soft skin believed to diminish drag by delaying the transition from laminar...

... a 10% reduction of parasitic drag and 13% increase in lift-to-drag when the hull surface is smooth. The legacy glider, made up of a faired bow and a cylindrical hull, suffers from laminar separation and up to 100% increase in induced drag if the flow over its bow is prevented from transitioning...

... sequence of phenomena leading to cumulative broaching that involves a change in the stability of the ordinary periodic motion on the horizontal plane, a transition towards subharmonic response and, ultimately, a sudden jump to resonance. Possible means for controlling the onset of such undesirable behavior...

...T. Pichon; A. Pauchet; A. Astolfi; D. H. Fruman; J-Y. Billard It is by now well established that, for Reynolds numbers larger than those corresponding to the conditions of laminar-to-turbulent boundary layer transition over a flat plate (≈0.5 × 106) and for a variety of wing shapes and cross...

... Engineers Artificial Intelligence oscillation propeller rate fishing vessel naval architect rudder instability trough equation ship ship research Existence nominal froude number Japan transition march 1996 bifurcation initial condition crest Journal of Ship Research, Vol. 40, No. 1...

... good. 1 3 1994 1 3 1994 1994. The Society of Naval Architects and Marine Engineers dtrc 4119 Efficiency propeller blade torque prop 4119 panel method transition section drag coefficient march 1994 Boundary Layer formulation thrust smooth dtrc 4119 propeller drag...

... on boundary-layer transition and profile drag for two laminar-flow foils at zero and moderate leeway angles. Using the modified en-transition criterion it is shown that the level of small-scale oceanic turbulence is an important parameter in the design of a laminar-flow foil. At high turbulence levels...

.... By introducing an effective angle of attack, it is possible to obtain close agreement in the calculated and measured suction side pressure distortion as well as the locations of the boundary-layer separation and transition. 1 3 1990 1 3 1990 1990. The Society of Naval Architects and Marine...

... in viscous drag. Three foil shapes have been designed and it is shown that their hydrodynamic characteristics are very much dependent on location and mode of boundary-layer transition. The planform parameter which strongly affects the capabilities of the keel to achieve laminar flow is leading-edge sweep...

...P. M. Naghdi; M. B. Rubin The problem of the transition to planing of a boat, in the presence of the effect of spray formation at the boat's leading edge, is investigated using a nonlinear steady-state solution of the equations of the theory of a directed fluid sheet for two-dimensional motion...

... favorable pressure gradient transition clauser parameter reynolds number Shape Parameter virtual origin velocity profile Boundary Layer equation Journal of Ship Research, Vol. 27, No. 3, Sept. 1983, pp. 147-157 Journal of Ship Research Low-Reynolds-Number Turbulent Boundary Layers in Zero...

... agreement with the measured spray thickness. The frictional resistance component obtained from the resistance measurements indicated an extensive laminar flow on the planing model bottom. An acetanilid film was sprayed on the planing model bottom which tripped the laminar-turbulent transition. The CF-values...

... cavitation inception. Consideration is given both to bodies having natural transition and bodies having laminar flow separation. The present approach assumes that cavitation inception is controlled by the pressure fluctuations in the region of natural transition or laminar separation superimposed upon...

... attached to the body even when a tension of about one half atm. existed at the minimum pressure point on the body. supercritical reynolds number inception observation nsrdc body laminar separation transition experiment cavitation cavity Upstream Oil & Gas inception ship research test body...

... production monitoring Upstream Oil & Gas transition ship research vortex arakeri polymer solution reynolds number reduction tunnel New York nucleus University Journal of Ship Research, Vol. 19, No. 4, Dec. 1975, pp. 193-205 Journal of Ship Research Cavitation Inception--A Selective Review...

... solution Reservoir Characterization transition hull energy loss friction strain energy Upstream Oil & Gas deflection requirement equation loading Time Period shear prototype ship hull application internal friction vibration The Analysis of Ship. Structures Subjected to Slamm,ng...