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We regard the Cauchy problem for a particular Whitham-Boussinesq system modelling surface waves of an inviscid incompressible fluid layer. The system can be seen as a weak nonlocal dispersive perturbation of the shallow water system. The…

偏微分方程分析 · 数学 2020-06-24 Evgueni Dinvay

In this paper we study global existence of weak solutions for the Quantum Hydrodynamics System in 2-D in the space of energy. We do not require any additional regularity and/or smallness assumptions on the initial data. Our approach…

偏微分方程分析 · 数学 2015-05-20 Paolo Antonelli , Pierangelo Marcati

With the aim of investigating the stability conditions of biaxial nematic liquid crystals, we study the effect of adding a non-adsorbing ideal depletant on the phase behavior of colloidal hard boardlike particles. We take into account the…

软凝聚态物质 · 物理学 2015-06-03 Simone Belli , Marjolein Dijkstra , René van Roij

We present nonlinear dynamic equations for nematic and smectic $A$ liquid crystals in the presence of an alternating electric field and explain their derivation in detail. The local electric field acting in any liquid-crystalline system is…

软凝聚态物质 · 物理学 2023-06-30 E. S. Pikina , E. I. Kats , A. R. Muratov , V. V. Lebedev

We formulate a comprehensive hydrodynamic theory of two-dimensional liquid crystals with generic $p-$fold rotational symmetry, also known as $p-$atics, of which mematics $(p=2)$ and hexatics $(p=6)$ are the two best known examples. Previous…

软凝聚态物质 · 物理学 2022-08-17 Luca Giomi , John Toner , Niladri Sarkar

We prove short-time well-posedness and existence of global weak solutions of the Beris--Edwards model for nematic liquid crystals in the case of a bounded domain with inhomogeneous mixed Dirichlet and Neumann boundary conditions. The system…

偏微分方程分析 · 数学 2013-11-15 Helmut Abels , Georg Dolzmann , YuNing Liu

We consider a phenomenological continuum theory for an extensile, overdamped active nematic liquid crystal, applicable in the dense regime. Constructed from general principles, the theory is universal, with parameters independent of any…

软凝聚态物质 · 物理学 2015-06-12 Elias Putzig , Gabriel S. Redner , Arvind Baskaran , Aparna Baskaran

A nematic liquid crystal confined to the surface of a sphere exhibits topological defects of total charge $+2$ due to the topological constraint. In equilibrium, the nematic field forms four $+1/2$ defects, located at the corners of a…

软凝聚态物质 · 物理学 2020-07-22 Yi-Heng Zhang , Markus Deserno , Zhan-Chun Tu

The possible symmetries of the biaxial nematic phase are examined against the implications of the presently available experimental results. Contrary to the widespread notion that biaxial nematics have orthorhombic symmetry, our study shows…

软凝聚态物质 · 物理学 2010-04-15 Panagiota K. Karahaliou , Alexandros G. Vanakaras , Demetri J. Photinos

We prove probabilistic well-posedness for a 2D viscous nonlinear wave equation modeling fluid-structure interaction between a 3D incompressible, viscous Stokes flow and nonlinear elastodynamics of a 2D stretched membrane. The focus is on…

偏微分方程分析 · 数学 2022-06-07 Jeffrey Kuan , Tadahiro Oh , Sunčica Čanić

We prove local well-posedness in regular spaces and a Beale-Kato-Majda blow-up criterion for a recently derived stochastic model of the 3D Euler fluid equation for incompressible flow. This model describes incompressible fluid motions whose…

数学物理 · 物理学 2018-11-14 Dan Crisan , Franco Flandoli , Darryl D. Holm

Many questions related to well-posedness/ill-posedness in critical spaces for hydrodynamic equations have been open for many years. In this article we give a new approach to studying norm inflation (in some critical spaces) for a wide class…

偏微分方程分析 · 数学 2017-08-28 Tarek M. Elgindi , Nader Masmoudi

We derive the hydrodynamic equations for the supersolid and superhexatic phases of a neutral two-dimensional Bose fluid. We find, assuming that the normal part of the fluid is clamped to an underlying substrate, that both phases can sustain…

凝聚态物理 · 物理学 2009-10-28 H. T. C. Stoof , K. Mullen , M. Wallin , S. M. Girvin

We have calculated the phase diagrams of one--component fluids made of five types of biaxial particles differing in their cross sections. The orientation of the principal particle axis is fixed in space, while the second axis is allowed to…

软凝聚态物质 · 物理学 2009-11-13 Yuri Martinez-Raton , Szabolcs Varga , Enrique Velasco

In this paper, we will establish the global existence of a suitable weak solution to the Erickson--Leslie system modeling hydrodynamics of nematic liquid crystal flows with kinematic transports for molecules of various shapes in…

偏微分方程分析 · 数学 2021-07-07 Hengrong Du , Changyou Wang

We study the hydrodynamics of compressible flows of active liquid crystals in the Beris-Edwards hydrodynamics framework, using the Landau-de Gennes $Q$-tensor order parameter to describe liquid crystalline ordering. We prove the existence…

偏微分方程分析 · 数学 2017-11-15 Gui-Qiang G. Chen , Apala Majumdar , Dehua Wang , Rongfang Zhang

We propose several linear, fully decoupled numerical schemes with first- and second-order temporal accuracy for a novel Q-tensor-based two-phase hydrodynamic model describing the coupling of active nematic liquid crystal solutions with…

数值分析 · 数学 2026-05-26 Xuelong Gu , Guanghua Ji , Qi Wang

Nematic liquid crystals possess three different phases: isotropic, uniaxial, and biaxial. The ground state of most nematics is either isotropic or uniaxial, depending on the external temperature. Nevertheless, biaxial domains have been…

软凝聚态物质 · 物理学 2009-11-11 Paolo Biscari , Gaetano Napoli , Stefano Turzi

Liquid crystals consisting of biaxial particles can exhibit a much richer phase behavior than their uniaxial counterparts. Usually, one has to rely on simulation results to understand the phase diagram of these systems, since very few…

软凝聚态物质 · 物理学 2025-03-28 Anouar El Moumane , Michael te Vrugt , Hartmut Löwen , René Wittmann

We prove the local well-posedness for a two phase problem of magnetohydrodynamics with a sharp interface. The solution is obtained in the maximal regularity space: $H^1_p((0, T), L_q) \cap L_p((0, T), H^2_q)$ with $1 < p, q < \infty$ and…

偏微分方程分析 · 数学 2020-03-03 Elena Frolova , Yoshihiro Shibata