Numerical simulation of oscillating flow field including a droplet

Watanabe, Tadashi

doi:10.1260/1750-9548.7.1.19

Cited by 3 publications

(7 citation statements)

References 19 publications

(39 reference statements)

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“…The finite element model of the magnetic field in MR damper was established in the multiphysics simulation software COMSOL/ Multiphysics, and the calculation of electromagnetic field was based on Maxwell's equations [6], as shown in (6)…”

Section: Static Magnetic Field Fe Modelingmentioning

confidence: 99%

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Performance Evaluation of Dampers Under Dynamic Impact Based on Magnetic Field FE and CFD

Liu

2020

IEEE Access

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It is necessary to install a damping energy absorbing structure for a certain type of naval gun test shell without projectile belt. Applicable high-performance dampers currently include viscoelastic colloidal damper and magnetorheological damper, and two kinds of special dampers for test shells have been designed and manufactured. In order to evaluate the mechanical properties of these two dampers under dynamic impact, a one-way coupling numerical method was proposed for simulation and analysis. Quasistatic experiments were used to verify the model based on magnetic field finite element (FE) and computational fluid dynamics (CFD). The model is also characterized by passive dynamic mesh and userdefined functions (UDF) based on C language. The results showed that the CFD models of both dampers were accurate. Though the colloidal damper is simpler in structure and lower in the cost, the MR damper has more significant damping and higher energy absorption ratio under impact. Compared with colloidal damper, MR damper is characterized by long working time, multiple vortices, chaotic streamlines and more uniform temperature distribution. When the power was continuously applied, the velocity of the impacted MR damper dropped to zero within 80ms, and the piston finally stopped at a stroke of 1.3mm. The colloidal damper reset within 8ms, and the reset velocity was 1.1m/s. In this study, the performance evaluation results of the two dampers were obtained, and the latest numerical methods for the mechanical performance analysis of colloidal dampers and MR dampers under dynamic impact were provided.

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Section: Static Magnetic Field Fe Modelingmentioning

confidence: 99%

“…Compared with colloidal dampers and other dampers, MR dampers feature larger hysteresis loop range [4]. Currently, MR dampers are being developed rapidly and widely used in vehicle engineering [5], medical equipment [6], aircraft [7] and weapon industries [8].…”

mentioning

confidence: 99%

Performance Evaluation of Dampers Under Dynamic Impact Based on Magnetic Field FE and CFD

Liu

2020

IEEE Access

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“…To solve the initial value problem applying the fourth-order Runge-Kutta algorithm, we rewrite the ordinary eqns (6) as a system of six first-order coupled differential equations by setting: (1) . Hence, the six first-order coupled differential equations and the initial conditions are presented as follows:…”

Section: Numerical Strategymentioning

confidence: 99%

“…In other words, in seeking the required values of the three guesses, we minimize the following function (11) For computing the zeros α 1 *, α 2 *, α 3 * of function F, we apply an algorithm based on the Newton's generalized technique which enables to update the initial guesses as follows: (12) where n denotes the iteration index and [J ] -1 is the inverted Jacobian matrix. The Jacobian itself is given by: (13) The quantities F 1 , F 2 and F 3 are defined as follows: (14) The new functions u j and q j , j = 1, 2, 3, are derived as : (15) It follows that the components of the Jacobian matrix are the values of functions u j , u j (1) and q j at the endpoint x = 1. In fact, functions u j and q j are solutions of three sets of coupled (1)…”

Section: Numerical Strategymentioning

confidence: 99%

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Viscous flow and heat transfer through two coaxial porous cylinders

Hona

Pemha

Nyobe

2015

The International Journal of Multiphysics

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Conjugate Heat Transfer Model Based on SIMPLE and Coupled Energy and Heat Equations

2021

IJM

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In this study, a numerical weak coupling strategy for the modeling of a conjugate heat transfer phenomenon is considered. Where the incompressible Navier Stokes equations are solved using the Semi-Implicit Method for Pressure Linked Equations (SIMPLE) as a first step, and then the heat conduction equation for solid is solved in a second step considering the convective velocity field resulting from the first step. A finite-difference approach is used for both discretized time and spatial operators. In this paper, a two-dimensional simulation case study of a steady uniform stream wise flow around heated rectangular and triangle solids is presented. The simulation is forward in time until the steady-state regime is reached as the residuals converge and tend to zero. The spatial analysis of the temperature is obtained through the numerical resolution of the incompressible Navier Stokes, energy equation, and the heat diffusion equation for the fluid and solid media, respectively. The results show the temperature, velocity, and pressure fields in the space domain. The coding is conducted in MATLAB®, and the flow chart of the method is provided. It was noted that the convection was more dominant than the diffusion.

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Numerical simulation of oscillating flow field including a droplet

Cited by 3 publications

References 19 publications

Performance Evaluation of Dampers Under Dynamic Impact Based on Magnetic Field FE and CFD

Performance Evaluation of Dampers Under Dynamic Impact Based on Magnetic Field FE and CFD

Viscous flow and heat transfer through two coaxial porous cylinders

Conjugate Heat Transfer Model Based on SIMPLE and Coupled Energy and Heat Equations

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