نتایج جستجو برای: hydrodynamic performance

تعداد نتایج: 1072666  

Journal: :IOP conference series 2023

Abstract An alternative twin rudder system known as the Gate Rudder© has been applied to newbuild vessels and an existing ship with aim improve their hydrodynamic performance reduce greenhouse gas emissions. The consists of two asymmetric cross-sections L-shaped blades located either side a propeller. generate thrust (duct effect) from propeller ship-included flow. Initially, forces moments sin...

Journal: :IOP Conference Series: Earth and Environmental Science 2020

Journal: :Journal of Fluid Mechanics 2022

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ژورنال: علوم آب و خاک 2020

The main purpose of the study is the operational simulation of main irrigation canal and evaluation of water delivery and distribution locally, regionally and overall using adequacy, efficiency, and equity indicators and “Desirability of water delivery and distribution” indicator. To achieve this goal, the hydrodynamic model of Roodasht irrigation network’s main canal was developed. The results...

2015
Morteza Kolahdoozan Omidreza Taheri Hadi Ghasemi

A new type of floating breakwaters (FBs) is introduced by changing the longitudinal section of π-shaped FBs into a stepwise shape. The hydrodynamic performance of so-called step floating breakwaters (SFBs) is evaluated through 144 experiments on SFBs of different types as well as π-shaped FBs. Initially, using the experimental data, the performance of SFBs was evaluated by comparison against π-...

2016
Kai Zhou Weishan Chen

In this work, numerical simulations are conducted to reveal the hydrodynamic mechanism of caudal fin propulsion. In the modeling of a bionic caudal fin, a universal kinematics model with three degrees of freedom is adopted and the flexible deformation in the spanwise direction is considered. Navier-Stokes equations are used to solve the unsteady fluid flow and dynamic mesh method is applied to ...

Journal: :journal of chemical and petroleum engineering 2009
ahmad azari رحمت ستوده قره باغ

in this paper, combustion of char in the riser of circulating fluidized bed was modeled using aspen plus. since physical and chemical phenomena are involved in the process, the model integrates the two-phase hydrodynamic sub-model with the reaction sub-model derived from the literature. in the proposed model, the fluidized bed is divided into several sections and the behavior of each section wa...

Journal: :تحقیقات آب و خاک ایران 0
محمد جواد منعم استادیار، دانشگاه تربیت مدرس زینب حسین زاده دانشجوی دکتری، دانشگاه تربیت مدرس

in order to improve the performance of irrigation networks, provide higher flexibility levels and improve water delivery methods, application of automatic control systems is suggested. in the coarse of the present study, a mathematical model of automatic pivot weir as based on pid control logic in combination with icss hydrodynamic model is developed. the developed model was tested under high f...

2015
Guang Pan Lin Lu

In this study an attempt has been made to study the hydrodynamic performance of pumpjet propulsor. Numerical investigation based on the Reynolds Averaged NavierStokes (RANS) computational fluid dynamics (CFD) method using structured grid, SST kω turbulence model has been carried out. The grid independence inspection is applied to verify accuracy of numerical simulation. The numerical prediction...

Journal: :The Journal of experimental biology 2008
Lisa Noelle Cooper Nils Sedano Stig Johansson Bryan May Joey D Brown Casey M Holliday Brian W Kot Frank E Fish

Minke whales (Balaenoptera acutorostrata) are the smallest member of balaenopterid whales and little is known of their kinematics during feeding maneuvers. These whales have narrow and elongated flippers that are small relative to body size compared to related species such as right and gray whales. No experimental studies have addressed the hydrodynamic properties of minke whale flippers and th...

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