The Added Mass Coefficient computation of sphere, ellipsoid and marine propellers using Boundary Element Method

Ghassemi, Hassan; Yari, Ehsan

doi:10.2478/v10012-011-0003-1

Cited by 47 publications

(24 citation statements)

References 8 publications

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“…, which is in agreement with those experimentally obtained [e.g., Pantaleone and Messer, 2011;Ghassemi and Yari, 2011;Tuveri et al, 2014].…”

Section: Virtual Mass Coefficientsupporting

confidence: 93%

“…Coefficients linked to rotation about an axis in the equatorial plane have not been included since the rotation was assumed as negligible. If d = e = f , then the projectile is a sphere and

C_{V}^{normalx normalx} = C_{V}^{normaly normaly} = C_{V}^{normalz normalz} = 0.5

, which is in agreement with those experimentally obtained [e.g., Pantaleone and Messer , ; Ghassemi and Yari , ; Tuveri et al , ].…”

Section: Ballistic Modelsupporting

confidence: 90%

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3‐D ballistic transport of ellipsoidal volcanic projectiles considering horizontal wind field and variable shape‐dependent drag coefficients

Bertin¹

2017

JGR Solid Earth

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An innovative 3‐D numerical model for the dynamics of volcanic ballistic projectiles is presented here. The model focuses on ellipsoidal particles and improves previous approaches by considering horizontal wind field, virtual mass forces, and drag forces subjected to variable shape‐dependent drag coefficients. Modeling suggests that the projectile's launch velocity and ejection angle are first‐order parameters influencing ballistic trajectories. The projectile's density and minor radius are second‐order factors, whereas both intermediate and major radii of the projectile are of third order. Comparing output parameters, assuming different input data, highlights the importance of considering a horizontal wind field and variable shape‐dependent drag coefficients in ballistic modeling, which suggests that they should be included in every ballistic model. On the other hand, virtual mass forces should be discarded since they almost do not contribute to ballistic trajectories. Simulation results were used to constrain some crucial input parameters (launch velocity, ejection angle, wind speed, and wind azimuth) of the block that formed the biggest and most distal ballistic impact crater during the 1984–1993 eruptive cycle of Lascar volcano, Northern Chile. Subsequently, up to 106 simulations were performed, whereas nine ejection parameters were defined by a Latin‐hypercube sampling approach. Simulation results were summarized as a quantitative probabilistic hazard map for ballistic projectiles. Transects were also done in order to depict aerial hazard zones based on the same probabilistic procedure. Both maps combined can be used as a hazard prevention tool for ground and aerial transits nearby unresting volcanoes.

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“…, which is in agreement with those experimentally obtained [e.g., Pantaleone and Messer, 2011;Ghassemi and Yari, 2011;Tuveri et al, 2014].…”

Section: Virtual Mass Coefficientsupporting

confidence: 93%

“…Coefficients linked to rotation about an axis in the equatorial plane have not been included since the rotation was assumed as negligible. If d = e = f , then the projectile is a sphere and

C_{V}^{normalx normalx} = C_{V}^{normaly normaly} = C_{V}^{normalz normalz} = 0.5

, which is in agreement with those experimentally obtained [e.g., Pantaleone and Messer , ; Ghassemi and Yari , ; Tuveri et al , ].…”

Section: Ballistic Modelsupporting

confidence: 90%

3‐D ballistic transport of ellipsoidal volcanic projectiles considering horizontal wind field and variable shape‐dependent drag coefficients

Bertin¹

2017

JGR Solid Earth

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“…This effect originates from the mass of fluid moved by the body under consideration while accelerating. Since its discovery, various methods have been developed to extract the added-mass coefficients [14][15] [16].…”

Section: Estimation Of Added Mass Coefficientsmentioning

confidence: 99%

“…The boundary element method (BEM) algorithm based on the work of Ghassemi and Yari [14] was used on a Tryphon cube meshed with a progressively increasing number of patches n p and the results for the addedmass and added-inertia coefficients are summarized in Tab. 2.…”

Section: Estimation Of Added Mass Coefficientsmentioning

confidence: 99%

“…Subsequently, triplets can be specifically composed for the performances, in order to match the general ambiance sought by the artistic team. The latest version of the triplet extraction software is integrated in a ROS node and is based on the aubio 14 library for Linux. The basic principle of the software is to detect the different notes of the short song.…”

Section: Song Tripletsmentioning

confidence: 99%

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Control, localization and human interaction with an autonomous lighter-than-air performer

St-Onge

Brèches

Sharf

et al. 2017

Robotics and Autonomous Systems

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Due to the recent technological progress, Human-Robot Interaction (HRI) has become a major field of research in both engineering and artistic realms, particularly so in the last decade. The mainstream interests are, however, extremely diverse: challenges are continuously shifting, the evolution of robot skills, as well as the advances in methods for understanding their environment radically impact the design and implementation of research prototypes. When directly deployed in a public installation or artistic performances, robots help foster the next level of understanding in HRI. To this effect, this paper presents a successful interdisciplinary art-science-technology project, the Aerostabiles, leading to a new way of conducting HRI research. The project consists of developing a mechatronic, intelligent platform embodied in multiple geometric blimps-cubes-that hover and move in the air. The artistic context of this project required a number of advances in engineering on the aspects of localization and control systems, flight dynamics, as well as interaction strategies, and their evolution through periods of collective activities called "research-creation residencies". These events involve artists, engineers, and performers working in close collaboration, sometimes, over several weeks at a time. They generate fruitful exchanges between all researchers, but most of all, they present a unique and creative way to direct and focus the robotics development. This paper represents an overview of the technical contributions from a range of expertise through the artistic drive of the Aerostabiles project.

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Increasing the Operational Stability of Vortex Frequency Transducers in Contact-Conductometric Vortex Flowmeters for Wastewater from Pulp and Paper Production

Lur’e,

Frolov

2023

Meas Tech

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The Added Mass Coefficient computation of sphere, ellipsoid and marine propellers using Boundary Element Method

Abstract: Added mass is an important and effective dynamic coefficient in accelerating, non uniform motion as a result

Cited by 47 publications

References 8 publications

3‐D ballistic transport of ellipsoidal volcanic projectiles considering horizontal wind field and variable shape‐dependent drag coefficients

3‐D ballistic transport of ellipsoidal volcanic projectiles considering horizontal wind field and variable shape‐dependent drag coefficients

Control, localization and human interaction with an autonomous lighter-than-air performer

Increasing the Operational Stability of Vortex Frequency Transducers in Contact-Conductometric Vortex Flowmeters for Wastewater from Pulp and Paper Production

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