907 Establishment of Three-Dimensional Fluid-Structure Interaction Analysis for Flexible Body : Analysis of the Operation and Flow of Robot Emulating Aquatic Animal

2012 ◽  
Vol 2012.87 (0) ◽  
pp. _9-7_
Author(s):  
Toshinori OCHIAI ◽  
Takahumi OMICHI ◽  
Noboru FUKUZAKI ◽  
Yogo TAKADA
Keyword(s):  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Flexible Body ◽  
Aquatic Animal ◽  
Fluid Structure ◽  
Structure Interaction

Effect of Vertical Pipe Length on the Thermal Stratification in Nuclear Power Plant Surgeline

2008 ◽  
Author(s):  
Young-Jong Kim ◽  
Maan-Won Kim ◽  
Hyun-Soon Lee ◽  
Eunmi Ko
Keyword(s):  
Thermal Stratification ◽  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Pipe Length ◽  
Transient Model ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Vertical Part ◽  
Surge Line

During operating transients of the pressurizer, thermal stratification effect may occur especially in the horizontal parts of the surge line. US NRC requires consideration of thermal stratification in surge line as phenomenon that must be considered in the design basis of the surge line. Generally, the fatigue usage factor of the surge line is comparative high, due to its operating temperature and pressure transients and its thermal stratification loads. In this study we have performed some parametric fluid-structure interaction analyses with different length variables of the vertical part of the surge line to study the relationship between the magnitude of thermal stratification and the length of vertical part of the surge line. The conservativeness of the traditional finite element model for thermal stratification analysis based on the conservative assumption in the surge line was also discussed by comparison of the results of three-dimensional time transient fluid-structure interaction analysis of this study. Stresses calculated with three-dimensional time transient model were considerably reduced comparing with the traditional analysis.

Parameter analysis of batoid fin motions using fluid–structure interaction-based simulation and design of experiments

2011 ◽  
Vol 225 (8) ◽  
pp. 1863-1873 ◽  
Author(s):  
J Lee ◽  
D H Kwon
Keyword(s):  
Design Of Experiments ◽  
Marine Mammals ◽  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Parameter Analysis ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Cownose Ray ◽  
Underwater Movement

Recently, much attention has been focused on the development of bio-mimetic underwater vehicles with a view to emulate the characteristics and performances of fishes and marine mammals. This study examines the thrust motions of batoids, which have excellent cruise and manoeuvrability characteristics during underwater movement. Numerical results concerning moving distance and velocity derived from batoid fin motions are studied. The commercial software package ADINA is employed for three-dimensional time-dependent fluid–structure interaction analysis. Following the numerical identification of fin motion under the simplified model of an actual cownose ray, a parameter design is performed to predict the optimal levels of fin width, thickness, frequency, and amplitude, and the significant factor effects of these in the design of experiments are discussed. This study also shows that fin frequency has strong interaction with amplitude and width.

scholarly journals Fluid-Structure Interaction Analysis of Parachute Finite Mass Inflation

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Xinglong Gao ◽  
Qingbin Zhang ◽  
Qiangang Tang
Keyword(s):  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Navier Stokes ◽  
Finite Mass ◽  
Central Difference ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Mass Inflation ◽  
Opening Phase

Parachute inflation is coupled with sophisticated fluid-structure interaction (FSI) and flight mechanic behaviors in a finite mass situation. During opening, the canopy often experiences the largest deformation and loading. To predict the opening phase of a parachute, a computational FSI model for the inflation of a parachute, with slots on its canopy fabric, is developed using the arbitrary Lagrangian-Euler coupling penalty method. In a finite mass situation, the fluid around the parachute typically has an unsteady flow; therefore, a more complex opening phase and FSI dynamics of a parachute are investigated. Navier-Stokes (N-S) equations for uncompressible flow are solved using an explicit central difference method. The three-dimensional visualization of canopy deformation as well as the evolution of dropping velocity and overload is obtained and compared with the experimental results. This technique could be further applied in the airdrop test of a parachute for true prediction of the inflation characteristics.

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