Numerical modeling of dynamic response and microcracking in shock-loaded polycrystalline transparent ceramic

2021 ◽  
Vol 129 (20) ◽  
pp. 205103
Author(s):  
Tong Li ◽  
Xiuxia Cao ◽  
Qian Wang ◽  
Yuanyuan Li ◽  
Hongliang He ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Dynamic Response ◽  
Transparent Ceramic

Numerical Modeling of Dynamic Stability Events on a High Speed Catamaran

2010 ◽  
Author(s):  
Sean Kery ◽  
Michael Webster ◽  
Janelle Prange
Keyword(s):  
Numerical Modeling ◽  
Dynamic Response ◽  
Wave Field ◽  
Dynamic Stability ◽  
High Speed ◽  
Model Testing ◽  
Model Tests ◽  
Numerical Analyses ◽  
Ship Motions ◽  
Transverse Stability

A dynamic stability event— not to be confused with ordinary or damaged transverse stability—is a sudden and seldom occurring event that can result from an unusual dynamic response in some combinations of speed, heading, ship motions phase and wave field. This paper defines several dynamic stability events and describes a process developed to investigate them. The process involves model tests, numerical analyses, and a high speed catamaran test vessel. The strengths and weaknesses of model testing are compared to numerical analyses, and the overall validity of the results are discussed.

Numerical modeling of liquid sloshing in flexible tank with FSI approach

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lydia Khouf ◽  
Mustapha Benaouicha ◽  
Abdelghani Seghir ◽  
Sylvain Guillou
Keyword(s):  
Numerical Modeling ◽  
Dynamic Response ◽  
Large Amplitude ◽  
Stokes Equations ◽  
Liquid Interface ◽  
Liquid Sloshing ◽  
Added Value ◽  
Two Phase ◽  
Content Type ◽  
Air Liquid Interface

Purpose The paper aims to present a numerical modeling procedure for the analysis of liquid sloshing in a flexible tank subjected to an external excitation, with taking into account the effects of fluid–structure interaction (FSI). Design/methodology/approach A numerical model based on coupling a two-phase flow solver and an elastic solid solver is developed in OpenFOAM code. The Arbitrary Lagrangian–Eulerian formulation is adopted for the two-phase Navier–Stokes equations in a moving domain. The volume of fluid (VOF) method is applied for the air–liquid interface tracking. The finite volume method is used for the spatial discretization of both the fluid and the structure dynamics equations. The FSI coupling problem is solved by an explicit coupling scheme. The model is validated for linear and nonlinear sloshing cases. Then, it is used to analyze the effects of the liquid sloshing on the dynamic response of the tank and the effects of the tank flexibility on the liquid sloshing. Findings The obtained results show that the flexibility of the tank walls amplifies the amplitude of the sloshing and increases the fluctuation period of the air–liquid interface. Furthermore, it is found that the bending moment acting on the tank walls may be underestimated when rigid walls assumption is adopted as usually done in sloshing tank modeling. Also, tank walls flexibility causes a phase shift in the free surface dynamic response. Originality/value A review of previous studies on liquid sloshing in flexible tanks revealed that FSI effects have not been clearly and comprehensively analyzed for large-amplitude liquid sloshing. Many physical and numerical aspects of this problem still require clarifications and enhancements. The added value of the present work and its originality lie in the investigation of large-amplitude liquid sloshing in flexible tanks by using a staggered coupling approach. This approach is carried out by an original combination of a linear solid solver with a two phase fluid solver in OpenFOAM code. In addition, FSI effects on some response quantities, identified and analyzed herein, have not been found in the previous works.

Dynamic response of transparent ceramic MgAl2O4 spinel

2011 ◽  
Vol 65 (9) ◽  
pp. 830-833 ◽  
Author(s):  
J. Kimberley ◽  
K.T. Ramesh
Keyword(s):  
Dynamic Response ◽  
Transparent Ceramic ◽  
Mgal2o4 Spinel

Numerical Modeling of Damping Characteristics in a Torsional Micro-Resonator

2012 ◽  
Author(s):  
Tathagata Acharya ◽  
Michael J. Martin
Keyword(s):  
Numerical Modeling ◽  
Phase Shift ◽  
Aspect Ratio ◽  
Dynamic Response ◽  
Dynamic Behavior ◽  
Ambient Air ◽  
Damping Characteristics ◽  
Micro Resonator ◽  
Parameters Of Interest

The dynamic behavior of torsional micro-resonators with dimensions, 100 μm × 20 μm, 100 μm × 10 μm, 100 μm × 5 μm, and 100 μm × 2.5 μm are modeled under continuum conditions in ambient air and different liquids and at angular frequencies of 1000 Hz and 5000 Hz respectively. The dynamic response in terms of energy lost per cycle, torsional amplitude and the phase shift are calculated and non-dimensionalized suitably. Finally efforts have been made to establish a relationship between the parameters of interest and the aspect ratio.

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