... angle willlead resistance boundary cfd method yangying accuracy vortice Proceedings of the Thirty-third (2023) International Ocean and Polar Engineering Conference Ottawa, Canada, June 19-23, 2023 Copyright © 2023 by the International Society of Offshore and Polar Engineers (ISOPE) ISBN 978-1...

... ABSTRACT The present paper analyses the vortical structures in the wake of a naval propeller operating underneath a free surface using detached-eddy simulation. We investigate the flow topology for several loading conditions and compare it with analogous observations behind a propeller...

... the Magnus effect is. INTRODUCTION When a fluid flows past a bluff body, vortices are shed from the bluff body alternately and cause fluctuant forces on it, generating vortex-induced vibrations (VIVs). The VIVs of a single cylinder have been extensively studied. The key effects of reduced velocity U r...

..., if rubbish is sucked, the resistance performance is just worse, which is a major disadvantage of the ducted propeller. propeller instability characteristic vortex structure efficiency ducted propeller vortex wake instability mechanism thrust coefficient vortice tip vortex engineering...

... (Pitcher, 1982) and (Weihs, 1983), saving energy consumption, (Mark, 1987) and (Zhu, 2009). It is found that fish will detect and use the vortices around them to greatly improve their swimming efficiency. Therefore, the interaction between the flexible filaments and surrounding water is an important...

..., reflux and other complex flow phenomena. In axial turbomachinery, leakage flows occur between blade tip and casing and are driven by the pressure difference between blade pressure and suction side. The vorticity generated by the leakage flow is rolled up into the so-called tip leakage vortex, which...

... hull pressure distribution sqcm vortex lateral force vortice coefficient uniform flow longitudinal plane free vortice basic coordinate system equation Proceedings of the Thirty-first (2021) International Ocean and Polar Engineering Conference www.isope.org Rhodes, Greece, June 20 25...

... Abstract The cavitation induced by tip vortices affects the hydrodynamic performance of a propeller and causes vibration and noise radiation. Thus, it is desirable to understand and predict its behavior. In this work, we present an adaptive mesh refinement (AMR) method to control the mesh size...

.... Gu et al. (1994) found that vortex from one side of the cylinder to the other reach to a high degree of concentration of vorticity next to cylinder when the frequency ratio (ƒ–ƒ s ) increased ( ƒ is the oscillating frequency of cylinder, ƒ s is the shedding frequency for the fixed cylinder). Lu...

... (VIV) vortex shedding mode, and the number of vortices released per cycle is much greater (at most twelve). INTRODUCTION Numerous studies have been dedicated to understanding Flow–induced oscillation (FIO), as a typical problem of fluid–structure interaction (FIS), because it is crucial in a wide...

... upstream oil & gas cfd simulation vortice vorticity magnitude fluid dynamics simulation normalized liutex numerically vortex lift coefficient froude number cylinder coefficient wake region multiphase flow circular cylinder equation surface-piercing circular cylinder free...

... are studied to assess the influences of the stratification. Results show that internal waves are generated by the presence of the sphere in stratified fluid, which results in an increase in resistance. The vertical motions and vortices are suppressed due to the stratification in vertical direction compared...

... shedding frequency seems to be due to weakening of the necklace vortices by local wall suction, which reduced the inrush in the wake region of a hemisphere. This caused a change in static pressure distribution over the hemisphere surface, moving the flow separation point upstream. The flow visualization...

.... The drag and lift characteristics, the vorticity, streamline distribution and the vortex shedding frequency are investigated. Numerical results are compared with those of the Finite Volume method (FVM) software calculations and indicate good agreements. INTRODUCTION Flow past a bluff body...

... cylinder vortex reservoir surveillance frequency upstream oil & gas circular cylinder drag coefficient coefficient production control detached-eddy simulation vortice multi-arc smooth cylinder stagnation point hydrodynamic characteristic production monitoring Analysis of hydrodynamic...

... ABSTRACT A set of nonlinear wave equations based on the acoustic perturbation theory in the frequency domain is developed to simulate vortex-sound interaction and analyze acoustic scattering phenomena from the underwater vortical flow over an airfoil. The vortex can influence the propagation...

... was used to simulate the process. The results in this paper showed that the shape of the vortices was different from the angle of attack. The vortex shedding process in homogenous and stratified fluid were different. Compared to homogenous fluid, the vortex shedding occurred first in the linearly...

... unavailable because of military necessity, experimental results for the generic submarine propeller INSEAN E1619 were reported by Di Felice et al. (2009), who studied open water performance and the wake of the propeller under various loads. axial velocity distribution vortice structure turbulence...

... the flexible cylinders is approximately simulated, with the two-dimensional vorticity transport equation numerically solved by the discrete vortex method in Lagrangian grid-independent frame. The dynamic equation of two cylinders are solved by the finite element method. Compared with the experimental results...

... interaction of 2–8 tandem jets with different spacing, and found that the effective velocity between consecutive adjacent jets was 0.3∼0.7 times the cross-flow attributed to the shielding effect of the leading jet. Gutmark (2011) concluded four distinct vortex structures of a single JICF: horseshoe vortices...