scholarly journals A new analytical approach for modeling the added mass and hydrodynamic interaction of two cylinders subjected to large motions in a potential stagnant fluid

2018 ◽  
Vol 77 ◽  
pp. 102-114 ◽  
Author(s):  
Romain Lagrange ◽  
Xavier Delaune ◽  
Philippe Piteau ◽  
Laurent Borsoi ◽  
José Antunes
Keyword(s):  
Analytical Approach ◽  
Hydrodynamic Interaction ◽  
Added Mass ◽  
Stagnant Fluid

scholarly journals Hydrodynamic Coefficients of Simplified Subsea Structures

2018 ◽  
Author(s):  
Fredrik Mentzoni ◽  
Mia Abrahamsen-Prsic ◽  
Trygve Kristiansen
Keyword(s):  
Cross Section ◽  
Significant Interaction ◽  
Hydrodynamic Interaction ◽  
Forced Oscillation ◽  
Large Range ◽  
Circular Cross Section ◽  
Added Mass ◽  
Hydrodynamic Coefficients ◽  
Force Estimation ◽  
Damping Coefficients

Simplified two-dimensional models, representing components of complex subsea structures, are experimentally investigated. Individual as well as combinations of components in different configurations are tested, in order to study the effect of hydrodynamic interaction. The components include porous plates and cylindrical pipes with circular cross-section. Hydrodynamic added mass and damping coefficients, relevant for force estimation during lifting operations, are presented. The coefficients are obtained based on forced oscillation tests for a large range of Keulegan–Carpenter (KC) numbers and forcing periods, and compared to numerical source panel results for the low KC limit, as well as recommendations given by DNV GL, where relevant. Coefficients for all configurations are found to be highly amplitude dependent. Significant interaction effects are found for the assembled structures, causing either reduced or increased total added mass and damping coefficients compared to the super-position of the coefficients for individual members.

The Motions of Adjacent Floating Structures in Oblique Waves

1984 ◽  
Vol 106 (2) ◽  
pp. 199-205 ◽  
Author(s):  
N. Kodan
Keyword(s):  
Hydrodynamic Interaction ◽  
Diffraction Theory ◽  
Added Mass ◽  
Exciting Force ◽  
Irregular Waves ◽  
Two Dimensional ◽  
Oblique Waves ◽  
Floating Structures ◽  
The Relationship ◽  
Good Agreement

This paper describes the theory on the effects of hydrodynamic interaction between two parallel slender structures in oblique waves. The method is based on the two-dimensional diffraction theory including the interaction effect. According to Ohkusu’s theory, the sectional interaction effects on the added mass, damping coefficient and wave exciting force are evaluated by analyzing incoming waves generated by the oscillatory motion of corresponding sections. Numerical results of the wave exciting force and moment and motions for the case of a combination of a ship and a rectangular barge are presented and compared with the results from model experiments. The comparison shows good agreement. Finally, some attention is given to the relationship between the arrangement of the two structures and responses in irregular waves.

Added-Mass Effect in Modeling of Cilia-Based Devices for Microfluidic Systems

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
J. Kongthon ◽  
B. McKay ◽  
D. Iamratanakul ◽  
K. Oh ◽  
J.-H. Chung ◽  
...  
Keyword(s):  
Drag Force ◽  
Vibrational Frequency ◽  
Hydrodynamic Interaction ◽  
Substantial Reduction ◽  
Fluid Flows ◽  
Mass Effect ◽  
Added Mass ◽  
Hydrodynamic Drag ◽  
Vibrational Dynamics ◽  
Inertial Loading

This article shows that the added mass due to fluid-structure interaction significantly affects the vibrational dynamics of cilia-based (vibrating cantilever-type) devices for handling microscale fluid flows. Commonly, the hydrodynamic interaction between the cilia-based actuators and fluid is modeled as a drag force that results in damping of the cilia motion. Our main contribution is to show that such damping effects cannot explain the substantial reduction in the resonant-vibrational frequency of the cilia actuator operating in liquid when compared with the natural frequency of the cilia in air. It is shown that an added-mass approach (that accounts for the inertial loading of the fluid) can explain this reduction in the resonant-vibrational frequency when operating cantilever-type devices in liquids. Additionally, it is shown that the added-mass effect can explain why the cilia-vibration amplitude is not substantially reduced in a liquid by the hydrodynamic drag force. Thus, this article shows the need to model the added-mass effect, both theoretically and by using experimental results.

Added-Mass Effect in Modeling of Cilia-Based (Vibrating Cantilever-Type) Devices for Microfluidic Systems

2007 ◽  
Author(s):  
B. McKay ◽  
D. Iamratanakul ◽  
K. Oh ◽  
J.-H. Chung ◽  
J. Riley ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Natural Frequency ◽  
Hydrodynamic Interaction ◽  
Substantial Reduction ◽  
Fluid Flows ◽  
Mass Effect ◽  
Added Mass ◽  
Drag Effect ◽  
Vibrational Dynamics ◽  
Structure Interaction

This article shows that the added mass due to fluid structure interaction significantly affects the vibrational dynamics of cilia-based (vibrating cantilever-type) devices for handling micro/nano-scale fluid flows. Commonly, the hydrodynamic interaction between the cilia-based actuator and fluid is modeled as a Stokes drag force that is proportional to the velocity. Our main contribution is to show that such a drag effect cannot explain the substantial reduction in the resonant frequency of the cilia actuator operating in liquid when compared to the natural frequency of the cilia in air. It is shown that an added-mass approach can explain this reduction in the resonant frequency when operating cantilever-type devices in fluid. Thus, this article shows the need to model the added-mass effect, both, theoretically and by using experimental results.

HYDRODYNAMIC INTERACTION OF TWO SPHERICAL BUBBLES RISING IN-LINE: A SEMI-ANALYTICAL APPROACH

2014 ◽  
Vol 201 (5) ◽  
pp. 674-687 ◽  
Author(s):  
Sergio A. Baz-Rodríguez ◽  
Jorge Ramírez-Muñoz ◽  
Alberto Soria ◽  
Julio C. Sacramento-Rivero
Keyword(s):  
Analytical Approach ◽  
Hydrodynamic Interaction ◽  
Spherical Bubbles

The Dynamics of TAT Process

2014 ◽  
Vol 35 (2) ◽  
pp. 103-133 ◽  
Author(s):  
Benoît Verdon ◽  
Catherine Chabert ◽  
Catherine Azoulay ◽  
Michèle Emmanuelli ◽  
Françoise Neau ◽  
...  
Keyword(s):  
Defense Mechanisms ◽  
Analytical Approach ◽  
Therapeutic Process ◽  
Practice Research ◽  
Rorschach Test ◽  
Mental Functioning ◽  
Projective Tests ◽  
The Subject ◽  
Latent Content ◽  
Rigorous Method

After many years of clinical practice, research and the teaching of projective tests, Shentoub and her colleagues (Debray, Brelet, Chabert & al.) put forward an original and rigorous method of analysis and interpretation of the TAT protocols in terms of psychoanalysis and clinical psychopathology. They developed the TAT process theory in order to understand how the subject builds a narrative. Our article will emphasize the source of the analytical approach developed by V. Shentoub in the 1950s to current research; the necessity of marking the boundary between the manifest and latent content in the cards; the procedure for analyzing the narrative, supported by an analysis sheet for understanding the stories' structure and identifying the defense mechanisms; and how developing hypotheses about how the mental functions are organized, as well as their potential psychopathological characteristics; and the formulation of a diagnosis in psychodynamic terms. In conjunction with the analysis and interpretation of the Rorschach test, this approach allows us to develop an overview of the subject's mental functioning, taking into account both the psychopathological elements that may threaten the subject and the potential for a therapeutic process. We will illustrate this by comparing neurotic, borderline, and psychotic personalities.

Maxim Berezovsky C-dur symphony in a context of new biographical scenario of artist’s life-creativity

2018 ◽  
pp. 13-25
Author(s):  
Olha Shumilina
Keyword(s):  
Eighteenth Century ◽  
Instrumental Music ◽  
Analytical Approach ◽  
Spiritual Direction ◽  
Theoretical Research ◽  
Orchestral Music ◽  
Musical Life ◽  
Analysis And Synthesis ◽  
Mental Modeling ◽  
Independent Work

Relevance of the study. The article studies recently found symphony of the prominent Ukrainian composer of the second half of the eighteenth century Maxim Berezovsky. He is widely known now as the author of cyclic spiritual concerts written for the Orthodox worship, and is practically unknown as a musician instrumentalist associated with the imperial theater and the court musical life. The work of M. Berezovsky as a secular musician determined the creative interest in composing instrumental music intended for secular chamber and orchestral music. Main objective of the article is a clarification of M.Berezovsky symphony as one of secular field artworks in the light of new summaries about artist’s life-creativity. Methodology. Taking into account peculiarities of the material and the analytical approach to its study, the methods of theoretical research have been chosen(abstraction, analysis and synthesis, induction and deduction, mental modeling, ascension from abstract to concrete, etc.). Conclusions. As a result of a study the symphony analysis in a context of new authentic statements about M.Berezovsky’s life-creativity. It was stated that this artwork was written not accidentally and detects absolute awareness of the artist in all composer’s niceties – how to build a topic and build a homophonic construction based on it, in a technique of orchestral construction, form creations of that time and etc. From the beginning of his creative career, M. Berezovsky was well aware of the possibilities of the orchestra as a performer, attached to the Italian opera and instrumental music. Symphony enriches our imagination about the works of M. Berezovsky in the field of secular instrumental and operatic music and extends the range of works of the artist beyond the spiritual direction. Some signs indicate that the Symphony was not an independent work, but an overture to the opera Demofont.

Maxim Berezovsky C-dur symphony in a context of new biographical scenario of artist’s life-creativity

2018 ◽  
pp. 13-25
Author(s):  
Olha Shumilina
Keyword(s):  
Eighteenth Century ◽  
Instrumental Music ◽  
Analytical Approach ◽  
Spiritual Direction ◽  
Theoretical Research ◽  
Orchestral Music ◽  
Musical Life ◽  
Analysis And Synthesis ◽  
Mental Modeling ◽  
Independent Work

Relevance of the study. The article studies recently found symphony of the prominent Ukrainian composer of the second half of the eighteenth century Maxim Berezovsky. He is widely known now as the author of cyclic spiritual concerts written for the Orthodox worship, and is practically unknown as a musician instrumentalist associated with the imperial theater and the court musical life. The work of M. Berezovsky as a secular musician determined the creative interest in composing instrumental music intended for secular chamber and orchestral music. Main objective of the article is a clarification of M.Berezovsky symphony as one of secular field artworks in the light of new summaries about artist’s life-creativity. Methodology. Taking into account peculiarities of the material and the analytical approach to its study, the methods of theoretical research have been chosen(abstraction, analysis and synthesis, induction and deduction, mental modeling, ascension from abstract to concrete, etc.). Conclusions. As a result of a study the symphony analysis in a context of new authentic statements about M.Berezovsky’s life-creativity. It was stated that this artwork was written not accidentally and detects absolute awareness of the artist in all composer’s niceties – how to build a topic and build a homophonic construction based on it, in a technique of orchestral construction, form creations of that time and etc. From the beginning of his creative career, M. Berezovsky was well aware of the possibilities of the orchestra as a performer, attached to the Italian opera and instrumental music. Symphony enriches our imagination about the works of M. Berezovsky in the field of secular instrumental and operatic music and extends the range of works of the artist beyond the spiritual direction. Some signs indicate that the Symphony was not an independent work, but an overture to the opera Demofont.

Sign in / Sign up

Export Citation Format

Share Document