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Showing papers in "Journal of Fluids and Structures in 2019"


Journal ArticleDOI
TL;DR: In this article, a coupled total Lagrangian (TL) and weakly compressible (WC) smoothed particle hydrodynamics (SPH) method is presented to model three-dimensional fluid-structure interactions (FSI) with deformable structures.

70 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of the length of the splitter plate on the amplitude and amplitude of the FIV was studied for a single cylinder with an attached rigid splitter.

59 citations


Journal ArticleDOI
TL;DR: In this paper, a mathematical model was proposed for the dynamic analysis of two-phase flow in vertical pipes considering different two phase flow models by including dissipative forces and common slip-ratio factors were utilized.

57 citations


Journal ArticleDOI
TL;DR: In this paper, the authors developed a methodology for the aerostructural design optimization of tow-steered composite wings using high-fidelity physics models and quantified the benefits of this new technology by performing a fuel burn minimization for both a tow steered and a conventional composite wing design.

54 citations


Journal ArticleDOI
TL;DR: In this article, a 1:15 scale model is used to further understand the influence of waves on the turbine power and thrust in both following-current and opposing-current conditions.

48 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigated the birth and the growth of the synchronous pressure wave in Francis turbines by energy consideration of an azimuthal-temporal Fourier decomposition of the three dimensional numerical flow solutions in an axisymmetric draft tube geometry that is slightly disturbed at the wall.

46 citations


Journal ArticleDOI
TL;DR: In this article, the effects of viscoelastic dissipation, mass ratio and damping ratio of surrounding environment were investigated for the pipe under random excitation and results showed a good agreement with other studies.

45 citations


Journal ArticleDOI
TL;DR: In this paper, the hydrodynamics of a two-body floating-point absorber (FPA) wave energy converter (WEC) under both extreme and operational wave conditions were evaluated for various regular wave conditions.

43 citations


Journal ArticleDOI
TL;DR: In this paper, numerical predictions are compared with experimental measurements of the hydrodynamic forces, deformations, and cavitation performance for a baseline NACA-0009 and an optimized hydrofoil.

39 citations


Journal ArticleDOI
TL;DR: In this article, high-fidelity numerical simulations using a Large-Eddy Simulation-Actuator Line Method (LES-ALM) are carried out to quantify the impact of row spacing.

39 citations


Journal ArticleDOI
TL;DR: In this paper, a three-dimensional transitional shock boundary layer interaction (SWBLI) over a finite-span flexible panel is investigated by performing direct numerical simulations (DNS), where the laminar inflow is at Mach 2, on which an oblique shock of turn angle 5. 6 2 ∘ is imposed.

Journal ArticleDOI
TL;DR: In this paper, the coupling response of a flexible catenary riser under the combination of internal slug flow and external shear current was studied using the non-intrusive technique of high speed imaging method.

Journal ArticleDOI
TL;DR: In this article, an experimental study of vortex-induced-vibration (VIV) of a curved flexible free-hanging cylinder in exponential shear flows is presented.

Journal ArticleDOI
TL;DR: In this article, the influence of fully nonlinear wave effects on floating wind turbine has been studied by comparing both floater motions and structural responses of tower base and mooring lines exposed to linear and fully non-linear long-crested irregular waves.

Journal ArticleDOI
TL;DR: In this paper, the influence of fluid flow velocity on natural frequencies and vibration modes is analyzed for pipes with varied curvature, taking into account extension of the pipe centerline. But the results of the analysis are limited.

Journal ArticleDOI
TL;DR: In this article, the authors presented a numerical study to address wake control of a circular cylinder subjected to two-dimensional laminar flow regime using single and multiple flexible splitter plates attached to the cylinder.

Journal ArticleDOI
TL;DR: In this paper, a numerical procedure that couples the Runge-Kutta discontinuous Galerkin method (RKDG), the boundary element method (BEM), and the finite element method was developed to study the dynamics of an underwater explosion bubble near a sandwich structure efficiently and accurately.

Journal ArticleDOI
TL;DR: In this paper, the root mean square across-wind tip displacement increases dramatically within a certain wind velocity range at 60°wind direction, which indicates that the vortex-induced resonance occurs, and the relation between the aerodynamic damping ratio and reduced wind velocity is further studied at this wind direction.

Journal ArticleDOI
TL;DR: In this paper, a two-phase flow computational fluid dynamics model REEF3D is used to investigate the breaking wave impact on a vertical cylinder in shallow waters. But the model is based on the incompressible Reynolds-Averaged Navier-Stokes (RANS) equations together with the level set method (LSM) and k − ω turbulence model.

Journal ArticleDOI
TL;DR: In this article, the Cauchy number was used to estimate the effective blade length for combined wave and current, which describes the ratio of hydrodynamic drag to the restoring force due to rigidity of a rigid blade.

Journal ArticleDOI
TL;DR: In this article, the two-degree-of-freedom vortex-induced vibrations of a single circular cylinder near a stationary plane for gap ratio G/D = 0.6-3.0, normalized boundary layer thickness δ ∕ D = 0 − 3.5, Reynolds number Re = 100 and reduced velocity U r = 2 − 16, where D is the cylinder diameter.

Journal ArticleDOI
TL;DR: In this article, an adaptive particle refinement (APR) technique is adopted to resolve correctly the boundary layer regions of the moving bodies, and to de-refine the particles that are transported far away, and a switch correction on the pressure forces term is adopted in the momentum equation to completely remove the occurrence of the so-called tensile instability that leads to the development of numerical cavitation in negative pressure regions.

Journal ArticleDOI
TL;DR: In this paper, wind tunnel tests are conducted on an elastically-mounted rigid section model with shallow Π cross section, which is free to vibrate in vertical and torsional directions.

Journal ArticleDOI
TL;DR: In this paper, the predictive capability of the selected simulation method is first verified by comparing the simulation results with test data acquired from experiments conducted in a drop-test tank, and the effects of the head shape parameters, shell thickness and water-entry state, such as the water entry velocity and angle, on the acceleration, pressure, stress and structural deformation of an elastic AUV during water entry impact are investigated.

Journal ArticleDOI
TL;DR: In this article, the dynamic behavior of a fully passive flapping foil hydrokinetic turbine at a Reynolds number of 6 × 104 was investigated at a femtoseconds, and it was found that the pitching axis must be placed at least 29% of the chord length behind the leading edge in order for the foil to present a non stationary response.

Journal ArticleDOI
TL;DR: In this article, the effect of wind veering on the mean aerodynamic forces for super high-rise buildings was investigated based on computational fluid dynamics (CFD) and numerical simulations were systematically performed on a 3D square cylinder with an aspect ratio of 9:1 using the large eddy simulation (LES) method.

Journal ArticleDOI
TL;DR: In this article, a two-degree-of-freedom (2DOF) system was used to model the debris-structure interaction and the model was compared with two experimental data sets using a rigid body and the effective stiffness model.

Journal ArticleDOI
TL;DR: In this paper, the wake patterns behind two freely vibrating circular cylinders in side-by-side arrangements are numerically investigated through two-dimensional computational fluid dynamics simulations, where the center-to-center spacing over a cylinder diameter ratio (s/D) is varied from 2 to 5.

Journal ArticleDOI
TL;DR: In this paper, the fluid-structure-acoustics interaction of flexible flapping wings is numerically studied by using an immersed boundary method at a Mach number of 0.1.

Journal ArticleDOI
TL;DR: In this article, a semi-passive flapping-foil turbine concept with a prescribed sinusoidal heave motion and a passive pitch motion was proposed and two-dimensional numerical simulations have been carried out at a Reynolds number of 3. 9 × 1 0 6 based on the chord length with a foil having its pitch axis located at the quarter-chord point.