Steady and Oscillatory Subsonic and Supersonic Aerodynamics around Complex Configurations

Morino, L.; Chen, Lee-Tzong; Suciu, E.

doi:10.2514/3.49706

Cited by 188 publications

(25 citation statements)

References 7 publications

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“…It is possible to specify the value of either σ or µ arbitrarily; provided that the no-flux boundary condition is satisfied, the flow outside the body remains the same; only the flow inside is changed. In the Morino formulation [15], the source strength is chosen to be…”

Section: The Boundary Element Methodsmentioning

confidence: 99%

“…PROCAL is an implementation of the Morino formulation [15] of the BEM described in Section 2. Its output files give the pressures and velocities at the corner points of the panels at each time step.…”

Section: An Implementation Using Openfoam and Procalmentioning

confidence: 99%

“…The velocity at any point in the flow field can then be obtained by summing the influence of each panel at the point. Analytic expressions for the influence of a panel at an arbitrary point are given by Morino et al [15].…”

Section: Comparison Of Rans and Bem Flow Fields In Open Watermentioning

confidence: 99%

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Modelling a Propeller Using Force and Mass Rate Density Fields

Hally¹

2018

JMSE

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A method to replace a propeller by force and mass rate density fields has been developed. The force of the propeller on the flow is calculated using a boundary element method (BEM) program and used to generate the force and mass rate fields in a Reynolds-averaged Navier-Stokes (RANS) solver. The procedures to calculate the fields and to allocate them to the cells of a RANS grid are described in detail. The method has been implemented using the BEM program PROCAL and the RANS solver OpenFOAM and tested using the propeller DTMB P4384 operating in open water. Close to the design advance coefficient, the time-average flow fields generated by PROCAL and by OpenFOAM with the force and mass rate fields match to within 1.5% of the inflow speed over almost all of the flow field, including the swept volume of the blades. At two-thirds of the design advance coefficient, the match is about 4% of the inflow speed. The sensitivity of the method to several of its free parameters is investigated.The RANS-BEM coupling scheme can be implemented whenever the interaction between the propeller and its immediate surroundings is important. The problem that has motivated this research is that of a propeller operating on a ship and its interaction with the hull and its appendages. The inflow into the BEM propeller program, including the interaction effects with the hull, is called the effective wake.The use of a force field to model the propeller has a long history. Actuator disk theory dates back to Rankine [2] and Froude [3]. In 1964, Hough and Ordway [4] determined an analytic solution for an actuator disk with constant radial load. Their expressions were generalized further by Conway [5,6]. The purpose of an actuator disk is to provide a rudimentary model of the action of the propeller so its effect on the flow around the ship can be determined. Typically, the mutual interaction of the disk and the ship is ignored although a linear theory of the interaction of an actuator disk and an axisymmetric body was developed by Sparenberg [7].The converse problem of determining the effect of the ship on the propeller, i.e., calculating the effective wake, was addressed by Huang and Groves [8] with their V-shaped Segments (VSM) method. It applied to axisymmetric hulls but was later generalized to arbitrary hulls by Bujnicki [9]. The Force Field Method (FFM) was developed at Maritime Institute of the Netherlands (MARIN) for the Cooperative Research Ships organization [10]. Neither VSM nor FFM account for the effect of the propeller on the flow around the ship.The mutual interaction of hull and propeller was modelled by Choi and Kinnas [11] using an Euler solver initialized one propeller diameter upstream of the propeller disk and a vortex lattice propeller code. Coupling of a RANS code for the flow past the ship and a vortex lattice code for the flow past the propeller has been reported by Stern et al. [12]. Three methods were tried for adding the effect of the propeller in the RANS solution: a force field method, a method in which extra bounda...

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Section: The Boundary Element Methodsmentioning

confidence: 99%

Section: An Implementation Using Openfoam and Procalmentioning

confidence: 99%

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Modelling a Propeller Using Force and Mass Rate Density Fields

Hally¹

2018

JMSE

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“…In the present study, the above integrals are computed by the analytical expressions introduced in Morino et al [40]. For brevity, the potential and its normal derivative on the hull surfaces are labelled as φ H and φ H n , and those on the free surface as φ F and φ F n .…”

Section: Numerical Implementation Of the Umspm (A) The Surface Integrmentioning

confidence: 99%

Experimental and numerical study of ship-to-ship interactions in overtaking manoeuvres

Yu¹,

Wang²,

Yeung³

2019

Proc. R. Soc. A.

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The study on close-quarter manoeuvring of vessels is of great importance for the safety and efficiency of maritime operations. In this paper, the hydrodynamic interactions between two vessels in moderate-speed overtaking manoeuvres are studied. Computational investigation by free-surface panel method is performed, and the results are assessed against experimental measurements from towing-tank model tests. The influences of overtaking speed and the speed difference between vessels on the hydrodynamic loads are studied. It is found that the free-surface deformation, on account of the blockage effects of the bodies, wave-making properties of the vessels, and the interference of unsteady wave patterns between the vessels, considerably affects the hydrodynamic interactions. In addition, it is also discovered that the influence from the unsteady heave and pitch motions of the hulls on the hydrodynamic loads can be non-negligible. Furthermore, it is found that the slower vessel to be overtaken generally experiences larger loads with more variation than the overtaking vessel. The loads on both vessels become more similar to those of a steady-state di-hull system when the speed difference between vessels is small.

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“…Theodorsen (1897Theodorsen ( -1978 trabalhou na instabilidade oscilatória de um aerofólio (flutter) independentemente de Birnbaum (1924), Wagner (1925), Bairstow (1925), Lamb (1927) e Glauert (1929. Em 1935, ele completou o manuscrito da NACA TR 496 (THEODORSEN, 1935), um dos mais citados relatórios da NACA de todos os tempos (MUKHOPADHYAY, 2003). Este relatório consiste na peça central da contribuição de Theodosen para a aeroelasticidade.…”

Section: Aspetos Gerais E Históricos Da Aeroelasticidadeunclassified

Aeroelasticidade transônica de aerofólio com arqueamento variável

Silva¹

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Primeiramente a Deus por todas as bênçãos que Ele me concedeu, pelo seu amor, sua graça e força. Pela sua orientação e por sua presença constante em minha vida. Ao Prof. Assoc. Flávio Donizeti Marques pela orientação, confiança, paciência e sobretudo pela dedicação com que se envolveu neste projeto tornando possível a realização das atividades deste trabalho. Ao Prof. Dr. João L. F. Azevedo e ao grupo do CTA/IAE, em São José dos Campos, por cooperarem diretamente nas atividades do trabalho fornecendo o código CFD e as informações necessárias para utilização e desenvolvimento deste. Ao Prof. Paulo Greco pela estimada ajuda durante o projeto. A todos os amigos, professores e funcionários do Departamento de Engenharia dos Materiais Aeronáutica e Automobilística pela ajuda, paciência e sabedoria, em especial: Claudio, Mauricio, Vinícius, Glauco, Edson, Elizangela... A minha mãe Cristina, meu pai Edmilson e minha irmã Talita pelo amor, apoio, compreensão, carinho e paciência ao longo de todos esses anos. A minha namorada Mariane pela ajuda e incentivo em momentos difíceis. Aos amigos e irmãos da república Dracovolans Mateus Bonamigo, Marcus Vinicius, Thiago Macedo e Luiz Homero pela colaboração, incentivo e auxilio. Ao amigo Diego pela revisão do trabalho. v vi Agradecimentos Aos Irmãos do L&H pelos momentos que compartilhamos e que compreenderam a importância deste trabalho em minha vida, em especial o Pastor Marco, Fernando, Kátia, Walter, Rodrigo e Renato. Ao CNPq pelo apoio financeiro. E por fim a todos aqueles que de alguma forma contribuíram para que este trabalho se tornasse realidade, meu MUITO OBRIGADO. "Porque dEle, por meio dEle e para Ele são todas as coisas. A Ele, pois, a glória eternamente. Amem" (Romanos 11:36).

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Steady and Oscillatory Subsonic and Supersonic Aerodynamics around Complex Configurations

Cited by 188 publications

References 7 publications

Modelling a Propeller Using Force and Mass Rate Density Fields

Modelling a Propeller Using Force and Mass Rate Density Fields

Experimental and numerical study of ship-to-ship interactions in overtaking manoeuvres

Aeroelasticidade transônica de aerofólio com arqueamento variável

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