Numerical analysis on the wake dynamics of a ducted propeller
TL;DR: In this paper, the wake dynamics and instabilities of a ducted propeller are numerically investigated at a Reynolds number of R e n = 1.765 × 10 5, and the numerical simulation is achieved by employing a hybrid RANS/LES model and the transient sliding mesh approach.
About: This article is published in Ocean Engineering.The article was published on 2019-01-01. It has received 48 citations till now. The article focuses on the topics: Ducted propeller & Vortex.
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TL;DR: An experimental and computational fluid dynamics (EFD and CFD) study of the appended notional submarine DARPA Suboff fitted with the 7-bladed E1658 propeller and operating near the free surface is presented in this paper.
48 citations
TL;DR: In this paper, a comparative study on the wake vortices generated by the hybrid RANS/LES family at the design operating condition J = 1. 0 was conducted. And the IDDES, SDES, and SBES showed the prominent resolving ability in vortice motion and evolution than the SAS and DDES.
38 citations
TL;DR: In this article, the authors used large eddy simulation (LES) method to predict the hydrodynamic performance of the pump-jet propulsion and added the FW-H acoustic model into the noise performance simulation after the flow stabilization.
31 citations
TL;DR: In this article, the authors discussed the transient characteristic of PJP and gave a comparative analysis between steady and transient simulations using Reynolds-averaged Navier-Stokes equations (RANSE) with a focus on the transient flow field and tip clearance effect.
30 citations
30 citations
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06 Jan 1992
8,784 citations
TL;DR: In this paper, the authors proposed the DES97 model, denoted DES97 from here on, which can exhibit an incorrect behavior in thin boundary layers and shallow separation regions, when the grid spacing parallel to the wall becomes less than the boundary-layer thickness.
Abstract: Detached-eddy simulation (DES) is well understood in thin boundary layers, with the turbulence model in its Reynolds-averaged Navier–Stokes (RANS) mode and flattened grid cells, and in regions of massive separation, with the turbulence model in its large-eddy simulation (LES) mode and grid cells close to isotropic. However its initial formulation, denoted DES97 from here on, can exhibit an incorrect behavior in thick boundary layers and shallow separation regions. This behavior begins when the grid spacing parallel to the wall Δ∥ becomes less than the boundary-layer thickness δ, either through grid refinement or boundary-layer thickening. The grid spacing is then fine enough for the DES length scale to follow the LES branch (and therefore lower the eddy viscosity below the RANS level), but resolved Reynolds stresses deriving from velocity fluctuations (“LES content”) have not replaced the modeled Reynolds stresses. LES content may be lacking because the resolution is not fine enough to fully support it, and/or because of delays in its generation by instabilities. The depleted stresses reduce the skin friction, which can lead to premature separation.
2,065 citations
Journal Article•
1,767 citations
Book•
01 Jan 2010
TL;DR: Marine Propellers and Propulsion as discussed by the authors provides comprehensive and cutting edge coverage to equip marine engineers, naval architects and anyone involved in propulsion and hydrodynamics with the knowledge needed to do the job.
Abstract: Propulsion technology is a complex, multidisciplinary topic with design, construction, operational and research implications Bringing together a wealth of disparate information from the field, "Marine Propellers and Propulsion" provides comprehensive and cutting edge coverage to equip marine engineers, naval architects and anyone involved in propulsion and hydrodynamics with the knowledge needed to do the job Drawing on experience from a long and varied career in consultancy, research, design and technical investigation, author John Carlton breaks the subject into three main sections-hydrodynamic theory, materials and mechanical considerations, and design, operation and performance Connecting essential theory to practical problems in design, analysis and operational efficiency, "Marine Propellers and Propulsion" is an invaluable resource, packed with hard-won insights, detailed specifications and data This is the most complete book available on marine propellers, fully updated and revised, with new chapters on propulsion in ice and high speed propellers It gathers together otherwise disparate material on the theory and practice of propulsion technology from the past 40 years' development, including the latest developments in improving efficiency It is written by a leading expert on propeller technology, essential for students, marine engineers and naval architects involved in propulsion and hydrodynamics
632 citations
TL;DR: This paper presents an algorithm for the local implementation of Galerkin projection of discrete fields between meshes, which extends naturally to three dimensions and is very efficient.
294 citations