Self-Excited Sloshing due to the Fluid Discharge Over a Flexible Plate Weir

1999 ◽  
Vol 122 (2) ◽  
pp. 192-197 ◽  
Author(s):  
Hiroshi Nagakura ◽  
Shigehiko Kaneko
Keyword(s):  
Analytical Model ◽  
The Self ◽  
Flexible Plate ◽  
Structure Model ◽  
Fast Breeder Reactor ◽  
Instability Mechanism ◽  
Dynamic Effects ◽  
Fluid Level ◽  
Fluid Structure ◽  
Cooling Circuit

This paper presents an analytical model for the self-excited sloshing due to the fluid discharge over a flexible weir, as observed in the cooling circuit of the French fast breeder reactor, Super-Phenix-1. To clarify the instability mechanism, we analyzed the case in which a rectangular reservoir was divided into an upstream and a downstream plenum by a flexible plate weir. The kinematic and dynamic effects of the discharged fluid on downstream plenum sloshing are discussed in details. Calculations are presented for the rectangular fluid-structure model with successively increasing fluid level difference between the upstream and downstream plenums, and the instability mechanism is examined. [S0094-9930(00)00302-4]

Self-Excited Sloshing due to the Fluid Discharge Over a Flexible Cylindrical Weir

1999 ◽  
Vol 122 (1) ◽  
pp. 33-39 ◽  
Author(s):  
Hiroshi Nagakura ◽  
Shigehiko Kaneko
Keyword(s):  
Analytical Model ◽  
The Self ◽  
Structure Model ◽  
Fast Breeder Reactor ◽  
Instability Mechanism ◽  
Dynamic Effects ◽  
Fluid Level ◽  
Fluid Structure ◽  
Cooling Circuit ◽  
Level Difference

This paper presents an analytical model for the self-excited sloshing due to the fluid discharge over a flexible weir, as observed in the cooling circuit of the French fast breeder reactor, Super-Phenix-1. To clarify the instability mechanism, we analyzed the case in which an annular reservoir was divided into an upstream and a downstream plenum by a flexible cylindrical weir. The kinematic and dynamic effects of the discharged fluid on downstream plenum sloshing are discussed in details. Calculations are presented for the cylindrical fluid-structure model with successively increasing fluid level difference between the upstream and downstream plenums, and the instability mechanism is examined. [S0094-9930(00)00901-X]

Ion acceleration by multiple laser pulses and their spontaneous electromagnetic fields in plasma

2008 ◽  
Vol 74 (1) ◽  
pp. 111-118
Author(s):  
FEN-CE CHEN
Keyword(s):  
Magnetic Fields ◽  
Electric Field ◽  
Analytical Model ◽  
Electromagnetic Fields ◽  
Equations Of Motion ◽  
Charged Particles ◽  
Laser Pulses ◽  
The Self ◽  
Electric And Magnetic Fields ◽  
Relativistic Equations

AbstractThe acceleration of ions by multiple laser pulses and their spontaneously generated electric and magnetic fields is investigated by using an analytical model for the latter. The relativistic equations of motion of test charged particles are solved numerically. It is found that the self-generated axial electric field plays an important role in the acceleration, and the energy of heavy test ions can reach several gigaelectronvolts.

scholarly journals Analysis of a Coupled Fluid-Structure Model with Applications to Hemodynamics

2016 ◽  
Vol 54 (2) ◽  
pp. 994-1019 ◽  
Author(s):  
T. Chacón Rebollo ◽  
V. Girault ◽  
F. Murat ◽  
O. Pironneau
Keyword(s):  
Structure Model ◽  
Fluid Structure

An Analytical Model for Predicting the Self-Capacitance of Multi-Layer Circular-Section Induction Coils

2018 ◽  
Vol 54 (5) ◽  
pp. 1-7
Author(s):  
Bin Wu ◽  
Xiaodong Zhang ◽  
Xiucheng Liu ◽  
Cunfu He
Keyword(s):  
Analytical Model ◽  
The Self ◽  
Circular Section

Controllable magnetic roughness surface with sustainable superhydrophobicity based on magnetorheological colloid

2020 ◽  
pp. 1045389X2094283
Author(s):  
Honghui Zhang ◽  
Zejun Tao ◽  
Yunheng Xiao
Keyword(s):  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Influential Factors ◽  
The Self ◽  
Surface Microstructure ◽  
Strength Testing ◽  
Structure Model ◽  
Roughness Surface ◽  
Self Cleaning ◽  
Surface Superhydrophobicity

In this article, magnetorheological colloid was adopted to coat a stainless steel substrate, which was cured under magnetic field to form magnetic roughness surface. Superhydrophobicity had been verified in the experiments, and the influential factors on the hydrophobic performance had been explored. A regular sawtooth structure model was proposed to relate the hydrophobicity with the formed surface microstructure. With the self-cleaning and bonding strength testing, the magnetic roughness surface is promising to keep sustainable superhydrophobicity in the self-cleaning or drag reduction applications.

Benchmark numerical solutions for two-dimensional fluid–structure interaction involving large displacements with the deforming-spatial-domain/stabilized space–time and immersed boundary–lattice Boltzmann methods

2017 ◽  
Vol 232 (14) ◽  
pp. 2500-2514 ◽  
Author(s):  
Yuan-Qing Xu ◽  
Yan-Qun Jiang ◽  
Jie Wu ◽  
Yi Sui ◽  
Fang-Bao Tian
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Fluid Structure Interaction ◽  
Spatial Domain ◽  
Space Time ◽  
Immersed Boundary ◽  
Flexible Plate ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Boltzmann Method

Body-fitted and Cartesian grid methods are two typical types of numerical approaches used for modelling fluid–structure interaction problems. Despite their extensive applications, there is a lack of comparing the performance of these two types of approaches. In order to do this, the present paper presents benchmark numerical solutions for two two-dimensional fluid–structure interaction problems: flow-induced vibration of a highly flexible plate in an axial flow and a pitching flexible plate. The solutions are obtained by using two partitioned fluid–structure interaction methods including the deforming-spatial-domain/stabilized space–time fluid–structure interaction solver and the immersed boundary–lattice Boltzmann method. The deforming-spatial-domain/stabilized space–time fluid–structure interaction solver employs the body-fitted-grid deforming-spatial-domain/stabilized space–time method for the fluid motions and the finite-difference method for the structure vibrations. A new mesh update strategy is developed to prevent severe mesh distortion in cases where the boundary does not oscillate periodically or needs a long time to establish a periodic motion. The immersed boundary–lattice Boltzmann method uses lattice Boltzmann method as fluid solver and the same finite-difference method as structure solver. In addition, immersed boundary method is used in the immersed boundary–lattice Boltzmann solver to handle the fluid–structure interaction coupling. Results for the characteristic force coefficients, tail position, plate deformation pattern and the vorticity fields are presented and discussed. The present results will be useful for evaluating the performance and accuracy of existing and new numerical methodologies for fluid–structure interaction.

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