Published in Journal of Hydrodynamics
Recently, the Liutex-based force field models are proposed and applied to some two-dimensional flows to explore the possibility of direct vortex control strategies. In this paper, we applied the Liutex-based centripetal force model to three-dimensional flow around a circular cylinder at Re = 3 900 . The turbulent flows around the three-dimensional ...
Published in Journal of Hydrodynamics
Vortical structures of a submarine with appendages are fully turbulent and complex. Thus, flow control and vortex manipulation are of great importance for the hydrodynamic performance and acoustic characteristics. Take the generic submarine model DARPA Suboff as the test case, a vortex tuning method based on the Liutex force field is proposed to ma...
Published in Journal of Hydrodynamics
Hydrodynamic cavitating flows usually consist of 3-D intense vortical flows that are detached from solid boundaries. Detached vortical flows normally generate heaps of cavitating flow structures, which, in turn, govern the location of cavitation erosion before collapse. Thus, this study introduces a new numerical approach based on the improved dela...
Published in Journal of Hydrodynamics
The Gymnarchus niloticus fish can swim in surging and heaving directions only with a long undulating ribbon fin while keeping its body along almost straight line. These features substantially inspire the design of underwater vessels with high maneuverability and station keeping performance, which is characterized by peculiar vortex structures induc...
Published in Journal of Hydrodynamics
This paper presents experimental measurements by the time-resolved particle image velocimetry (TR-PIV) for the turbulent boundary layer (TBL) over the smooth surface, the superhydrophobic (SH) surface, and the superhydrophobic-riblets (SR) surface in an open-surface recirculating water channel. The Reynolds number based on the wall friction velocit...
Published in Journal of Hydrodynamics
Part 2 reports the validation, local force and local flow study results for the free-running added power simulations whose conditions are the same as the self-propulsion test except for the increased propeller rotational speed and the presence of wave. When targeting the same mean Froude number in the wave condition, the propeller requires the incr...
Published in Journal of Hydrodynamics
The incompressible unsteady Reynolds-averaged Navier-Stokes (URANS) simulations are performed for a free-running container ship in maneuvering conditions: the starboard and portside turning circle simulations with 35° rudder deflection. The validation variables include trajectory, motions, and propeller performances, and the prediction shows accept...
Published in Journal of Hydrodynamics
The Knowledge of turbulent flow developing inside and around the bottom trawl net is of great importance not only for improving the hydrodynamic performance of the gear but also for the selectivity via the fish response, such as the herding response or escape behavior. The 3-D Electromagnetic Current Velocity Meter (ECVM) measurements were performe...
Published in Journal of Hydrodynamics
Generating body-fitted particle distribution for arbitrarily complex geometry underpins the applications of particle-based method to engineering and bioengineering and is highly challenging, and thus hinders the potential of particle methods. In this paper, we present a new computer-aided design (CAD) compatible body-fitted particle generator, term...
Published in Journal of Hydrodynamics
The destabilization of an erodible sediment bed by a reproducible impulsive phenomenon is studied experimentally. For this, a specific setup is designed to produce a well-controlled isolated vortex, advected over a uniform sand bed. Particle image velocimetry (PIV) measurements are performed to get fluid flow information; suspended particles images...
