Performance analysis of a horn-type rudder implementing the Coanda effect

Seo, Dae-Won; Oh, Jungkeun; Jang, Jaeshin

doi:10.1016/j.ijnaoe.2016.09.003

Cited by 10 publications

(4 citation statements)

References 10 publications

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“…The viscosity model adopted is the SST kω. The numerical models are decided according to recommendations for problems involving Coanda flows and high complexity surfaces, presented by Seo et al (2017), Trancossi et al (2016a), Mazudar et al (2015 and Versteeg and Malalasekera (2007). Given that the study case is a turbulent flow with intense pressure gradients, a time-dependent model with a timestep of 1.0×10 -3 s and total time of 6.0 s is adopted.…”

Section: Problem Descriptionmentioning

confidence: 99%

Phenomenological Analysis of a Conceptual Waterjet Propulsor Based on the Coanda Effect

Lemos

Marques

Rocha

et al. 2019

RETERM

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This work is part of a research project conceived at the Federal University of Rio Grande. The project aims to create and develop mechanical devices that use the Coanda effect to enhance their overall efficiency. The focus herein is analyzing the physical phenomenon occurring in a conceptual water-jet propulsor. In the proposed concept, a water-jet propulsor has its impeller replaced by injectors that produce the so-called Coanda effect, increasing thereby the mass flow rate. In order to simulate the flow through the propulsor, a numerical model was developed. In this model the time-averaged conservation equations of mass and momentum were solved numerically by the finite volume method, more precisely with the commercial package ANSYS FLUENT (version 14.0). For the closure of the constitutive equations, the k-ω URANS turbulence model was employed. The simulation was performed for a transient state with a timestep of ∆t = 1×10-3 s and a total physical time of t = 6.0 s. Static pressure fields, streamlines and speed profiles are used to analyze the equipment performance and the phenomenon occurrence. The results show that the Coanda Effect is able to generate thrust in a waterjet propulsion device without impeller. The study suggests that the employment of this principle has promising applicability in marine propulsion and deserves attention on future works.

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Section: Problem Descriptionmentioning

confidence: 99%

Phenomenological Analysis of a Conceptual Waterjet Propulsor Based on the Coanda Effect

Lemos

Marques

Rocha

et al. 2019

RETERM

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“…In the past, several researchers worked on this topic using both experimental (among the others [13][14][15][16]) and numerical approaches. Different numerical approaches have been adopted in the reference literature, ranging from simpler potential ones (see for instance [17][18][19][20][21]) up to more demanding ones based on the complete flow equations ( [7,[22][23][24]).…”

Section: Introductionmentioning

confidence: 99%

“…The researchers who adopted numerical codes have focused their attention on different flow problems, ranging from the isolated rudder condition, often with peculiar rudder shapes ( [14,15]) or when it interacts with a propeller ( [27,28]). Others, on the contrary, considered the more complex problem which includes the mutual interactions of the complete system, i.e., rudder-propeller-hull (as in [24]).…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Rudder–Propeller Interaction

Villa

Franceschi

Viviani

2020

JMSE

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The proper evaluation of the Rudder–Propeller interactions is mandatory to correctly predict the manoeuvring capability of a modern ship, in particular considering the commonly adopted ship layout (rudder often works in the propeller slipstream). Modern Computational Fluid Dynamics (CFD) solvers can provide, not only the performance of the whole system but also an insight into the flow problem. In the present paper, an open-source viscous flow solver has been validated against available literature experimental measurements in different conditions. After an extensive analysis of the numerical influence of the mesh arrangement and the turbulent quantities on the rudder provided forces, the study focused its attention on the forces generated by the rudder varying the propeller loading conditions and the mutual position between the two devices. These analyses give a hint to describe and improve a commonly-used semi-empirical method based on the actuator disk theory. These analyses also demonstrate the ability of these numerical approaches to correctly predict the interaction behaviour in pre-stall conditions with quite reasonable computational requests (proper also for a design stage), giving additional information on the sectional forces distribution along the span-wise rudder direction, useful to further develop a new semi-empirical rudder model.

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“…One illustration of the domain subjected to Coanda effect flow can be seen in Figure 1. Thus, the Coanda effect became the target of many studies where several mechanisms which were based on this effect were developed, such as cooling [3][4][5], safety devices [6], aerospace applications [7][8][9][10] and few recent studies in marine devices [11,12]. The Coanda effect is also important for the design of Unmanned Aerial Vehicles (UAV).…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Turbulent Air and Water Flows in a Nozzle Based on the Coanda Effect

Halal

Marques

Rocha

et al. 2019

JMSE

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In the present work it is performed a numerical study for simulation of turbulent air and water flows in a nozzle based on the Coanda effect named H.O.M.E.R. (High-Speed Orienting Momentum with Enhanced Reversibility). The main purposes of this work are the development of a numerical model for simulation of the main operational principle of the H.O.M.E.R. nozzle, verify the occurrence of the physical principle in a device using water as working fluid and generate theoretical recommendations about the influence of the difference of mass flow rate in two inlets and length of septum over the fluid dynamic behavior of water flow. The time-averaged conservation equations of mass and momentum are solved with the Finite Volume Method (FVM) and turbulence closure is tackled with the k-ε model. Results for air flow show a good agreement with previous predictions in the literature. Moreover, it is also noticed that this main operational principle is promising for future applications in maneuverability and propulsion systems in marine applications. Results obtained here also show that water jets present higher deflection angles when compared with air jets, enhancing the capability of impose forces to achieve better maneuverability. Moreover, results indicated that the imposition of different mass flow rates in both inlets of the device, as well as central septum insertion have a strong influence over deflection angle of turbulent jet flow and velocity fields, indicating that these parameters can be important for maneuverability in marine applications.

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Performance analysis of a horn-type rudder implementing the Coanda effect

Cited by 10 publications

References 10 publications

Phenomenological Analysis of a Conceptual Waterjet Propulsor Based on the Coanda Effect

Phenomenological Analysis of a Conceptual Waterjet Propulsor Based on the Coanda Effect

Numerical Analysis of the Rudder–Propeller Interaction

Numerical Study of Turbulent Air and Water Flows in a Nozzle Based on the Coanda Effect

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