|
|
|
|
|
João Baltazar, Douwe Rijpkema and José Falcão de Campos
In this study, a Reynolds averaged Navier-Stokes solver is used for prediction of the propeller performance in open-water conditions at different Reynolds numbers ranging from 104
10
4
to 107
10
7
. The ??-??
k
-
?
SST turbulence model and the ??-R~e??...
ver más
|
|
|
|
|
|
|
|
|
|
|
Fabrizio Ortolani, Giulio Dubbioso, Roberto Muscari, Salvatore Mauro and Andrea Di Mascio
The understanding of the performance of a propeller in realistic operative conditions is nowadays a key issue for improving design techniques, guaranteeing safety and continuity of operation at sea, and reducing maintenance costs. In this paper, a summar...
ver más
|
|
|
|
|
|
|
|
|
|
|
Fabrizio Ortolani, Giulio Dubbioso, Roberto Muscari, Salvatore Mauro and Andrea Di Mascio
The understanding of the performance of a propeller in realistic operative conditions is nowadays a key issue for improving design techniques, guaranteeing safety and continuity of operation at sea, and reducing maintenance costs. In this paper, a summar...
ver más
|
|
|
|
|
|
|
|
|
|
|
Bradford Knight and Kevin Maki
Accurate and efficient prediction of the forces on a propeller is critical for analyzing a maneuvering vessel with numerical methods. CFD methods like RANS, LES, or DES can accurately predict the propeller forces, but are computationally expensive due to...
ver más
|
|
|
|
|
|
|
|
|
|
|
Rajan Gill and Raffaello D?Andrea
Two low-order, parametric models are developed for the forces and moments that a rotating propeller undergoes in forward flight. The models are derived using a first-principles-based approach, and are computationally efficient in the sense of being repre...
ver más
|
|
|
|
|
|
|
|
|
|
|
Rolf Nagel
Pág. 1601 - 1610
The project focusses on the integration of energy saving technologies in the early design stage of ships, using advanced simulation models to be developed for the energy grid of the ship. The optimum combination of energy consumers incl. energy recovery ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Farid Saemi and Moble Benedict
Minimizing electric losses is critical to the success of battery-powered small unmanned aerial systems (SUASs) that weigh less than 25 kgf (55 lb). Losses increase energy and battery weight requirements which hinder the vehicle?s range and endurance. How...
ver más
|
|
|
|
|
|
|
|
|
|
|
Vladimir Pelic, Ozren Bukovac, Radoslav Radonja and Nastia Degiuli
Modern marine propulsion systems must be reliable, energy efficient, environmentally friendly, and economical. Efforts to reduce fuel costs and carbon dioxide (CO2) emissions per nautical mile have a significant impact on the choice of propulsion system....
ver más
|
|
|
|
|
|
|
|
|
|
|
Changfeng Ge, Kyle Dunno, Mukul Anand Singh, Long Yuan and Li-Xin Lu
Technological advances in unmanned aerial vehicles (UAVs) have made it possible to employ drone deliveries for packaged products, but currently no standards of practice are available to qualify packaged products traveling through this distribution channe...
ver más
|
|
|
|
|
|
|
|
|
|
|
Ante Sikirica, Zoran Carija, Lado Kranjcevic and Ivana Lucin
This paper evaluates the applicability of the hexahedral block structured grids for marine propeller performance predictions. Hydrodynamic characteristics for Potsdam Propeller Test Case (PPTC), namely thrust and torque coefficients, were determined usin...
ver más
|
|
|
|
|
|
|
|
|
|
|
Bao Liu, Maarten Vanierschot and Frank Buysschaert
The present work examines the capabilities of two transition models implemented in ANSYS Fluent in the open-water performance prediction of a rim-driven thruster (RDT). The adopted models are the three-equation ??-????-??
k
-
k
L
-
?
and the four-equati...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yoo-Chul Kim, Kwang-Soo Kim, Seongmo Yeon, Young-Yeon Lee, Gun-Do Kim and Myoungsoo Kim
This study proposes machine learning-based prediction models to estimate hull form performance. The developed models can predict the residuary resistance coefficient (CR" role="presentation">????CR
C
R
), wake fraction (wTM" role="presentation">??????wTM...
ver más
|
|
|
|
|
|
|
|
|
|
|
Chunyu Guo, Xu Wang, Chongge Chen, Yinghong Li and Jian Hu
Propulsion noise is an enduring problem of significant military and environmental importance. Hence, it is crucial to investigate propeller noise characteristics. In this study, the hydrodynamic performance and noise level of the DARPA (Defense Advanced ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Carlo Giorgio Grlj, Nastia Degiuli, Andrea Farkas and Ivana Martic
The present study aims to investigate the scale effects of the open water propeller performance using computational fluid dynamics (CFD). The results are presented for the propeller which was previously 3D scanned and digitized. The results obtained usin...
ver más
|
|
|
|
|
|
|
|
|
|
|
Leonie S. Föhring, Peter Møller Juhl and Dietrich Wittekind
Low-frequency broadband shipping noise causes a growing concern for marine fauna together with the demand for noise reduction. Detailed analyses of the cavitation behaviour in the time domain serve as a prerequisite for steps toward quieter propellers. U...
ver más
|
|
|
|
|
|
|
|
|
|
|
Alex Zanotti
Side-by-side propellers characterise the architecture of most new electric aircraft (eVTOLs) designed in recent years for urban air mobility. The aerodynamic interaction between side-by-side propellers represents one of the key phenomena that characteris...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yiran Su, Seungnam Kim and Spyros A. Kinnas
In order to predict ship hull pressure fluctuations induced by marine propellers, a combination of several numerical schemes is used. The propeller perturbation flow is solved by the boundary element method (BEM), while the coupling between a BEM solver ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yiran Su, Seungnam Kim and Spyros A. Kinnas
In order to predict ship hull pressure fluctuations induced by marine propellers, a combination of several numerical schemes is used. The propeller perturbation flow is solved by the boundary element method (BEM), while the coupling between a BEM solver ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Lin Ke, Jinming Ye and Qiufeng Liang
Flow field performance tests of submarine models with cross-rudder and X-rudder stern control surfaces were conducted to study X-rudders? performance in non-uniform flow fields. The tests compared performance parameters such as resistance, lateral steeri...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jaan H. Pu
The failure of swirling ship propellers in marine environments can lead to huge repair costs. One of the main causes of such failure is when propellers tangle with vegetation, especially in shallow flow environments like ports, harbours, or shipyards. In...
ver más
|
|
|
|
|
|