Nonlinear modelling of a rotating multi-component dusty plasma

AbstractIn this paper, a simple and practitioners-friendly calibration strategy to consistently link target panel-scale mechanical properties (that can be found in national standards) to model material-scale mechanical properties is presented. Simple masonry panel geometries, with various boundary conditions, are utilized to test numerical models and calibrate their mechanical properties. The calibration is successfully conducted through five different numerical models (most of them available in commercial software packages) suitable for nonlinear modelling of masonry structures, using nonlinear static analyses. Firstly, the panel stiffness calibration is performed, focusing the attention to the shear stiffness. Secondly, the panel strength calibration is conducted for several axial load ratios by attempts using as reference the target panel strength deduced by well-known analytical strength criteria. The results in terms of panel strength for the five different models show that this calibration strategy appears effective in obtaining model properties coherent with Italian National Standard and Eurocode. Open issues remain for the calibration of the post-peak response of masonry panels, which still appears highly conventional in the standards.

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Propagation of dust-ion-acoustic solitary waves for damped modified Kadomtsev–Petviashvili–Burgers equation in dusty plasma with a q-nonextensive nonthermal electron velocity distribution

SeMA Journal ◽

10.1007/s40324-021-00242-5 ◽

2021 ◽

Author(s):

Santanu Raut ◽

Kajal Kumar Mondal ◽

Prasanta Chatterjee ◽

Ashim Roy

Keyword(s):

Velocity Distribution ◽

Dusty Plasma ◽

Solitary Waves ◽

Burgers Equation ◽

Electron Velocity ◽

Nonthermal Electron ◽

Electron Velocity Distribution ◽

Ion Acoustic Solitary Waves ◽

Ion Acoustic

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A numerical study of gravity-driven instability in strongly coupled dusty plasma. Part 1. Rayleigh–Taylor instability and buoyancy-driven instability

Journal of Plasma Physics ◽

10.1017/s0022377821000349 ◽

2021 ◽

Vol 87 (2) ◽

Author(s):

Vikram S. Dharodi ◽

Amita Das

Keyword(s):

Dusty Plasma ◽

Numerical Study ◽

Fluid Model ◽

Density Region ◽

Strongly Coupled ◽

Rising Bubble ◽

Inhomogeneous Density ◽

Gravity Driven ◽

The Individual ◽

Strongly Coupled Dusty Plasma

Rayleigh–Taylor (RT) and buoyancy-driven (BD) instabilities are driven by gravity in a fluid system with inhomogeneous density. The paper investigates these instabilities for a strongly coupled dusty plasma medium. This medium has been represented here in the framework of the generalized hydrodynamics (GHD) fluid model which treats it as a viscoelastic medium. The incompressible limit of the GHD model is considered here. The RT instability is explored both for gradual and sharp density gradients stratified against gravity. The BD instability is discussed by studying the evolution of a rising bubble (a localized low-density region) and a falling droplet (a localized high-density region) in the presence of gravity. Since both the rising bubble and falling droplet have symmetry in spatial distribution, we observe that a falling droplet process is equivalent to a rising bubble. We also find that both the gravity-driven instabilities get suppressed with increasing coupling strength of the medium. These observations have been illustrated analytically as well as by carrying out two-dimensional nonlinear simulations. Part 2 of this paper is planned to extend the present study of the individual evolution of a bubble and a droplet to their combined evolution in order to understand the interaction between them.

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