Abstract The determination of ship motions in a seaway heavily depends on hydrodynamic coefficients. However, the coefficients related to roll-motion exhibit nonlinear behavior due viscous effects and relatively small wave damping, which pose significant challenges. To overcome these challenges, several studies have employed computational fluid dynamics (CFD) analyze performance, leveraging adv...

A study of a 10/10 vertical zigzag maneuver the generic submarine Joubert BB2 is presented. CFD simulations, involving moving planes and rotating propeller using dynamic overset technique, are performed at constant rotational speed in model scale on four systematically refined grids compared against experimental data for depth, pitch, pitch rate, drift, velocity, absolute thrust torque coeffici...

Abstract This paper addresses a simple energy-based overset finite element method (EbO-FEM) to solve pseudo-static deformation problems consisting of overlapped meshes based on the domain composition (DCM). scheme is non-iterative equation-based for enforcing continuity displacement field. Hence, consumes possible minimal computational costs with non-conforming overlapping meshes. The system’s ...

We are developing multigrid methods that will efficiently solve elliptic problems with anisotropic and discontinuous coefficients on adaptive grids. The final product will be a library that provides for the simplified solution of such problems. This library will directly benefit the efforts of other Laboratory groups. The focus of this work is research on serial and parallel elliptic algorithms...

Abstract We report on a series of highly resolved large-eddy simulations the LS89 high-pressure turbine (HPT) vane, varying exit Mach number between Ma = 0.7 and 1.1. In order to accurately resolve blade boundary layers enforce pitchwise periodicity, we for first time use an overset mesh method, which consists O-type grid around overlapping with background H-type grid. The were conducted either...

This study proposes a generalized coordinate smoothed particle hydrodynamics (GCSPH) method coupled with an overset using the total Lagrangian formulation for solving large deformation and crack propagation problems. In GCSPH, physical space is decomposed into multiple domains, each of which mapped to avoid singularities as well flexibly change spatial resolution. The SPH particles are then non...

This paper reports on the simulation of the near-nozzle region of a moderate Reynolds number cold jet flow exhausting from a chevron nozzle. The chevron nozzle considered in this study is the SMC001 nozzle experimentally studied by the researchers at the NASA Glenn Research Center. This nozzle design contains six symmetric chevrons that have a five-degree penetration angle. The flow inside the ...

Abstract The capillary interactions are prominent for a micro-sized particle at the steel—slag interface. In this study, dynamics of spherical interacting with interface is numerically investigated using volume fluid method in combination overset grid technique to account motion. simulations have shown particle’s separation process and successfully captured formation continuous evolution menisc...

Currently, most wind turbine performance analyses and simulations are performed assuming constant pitch yaw angles during each rotation. Nevertheless, induced vibration or rotor imbalance can affect the angle within In this study, effects of low-amplitude sinusoidal oscillations blade on a was investigated numerically by comparing it against baseline (without variations). Large eddy were in whi...