Physical Review E (Computational physics)

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Recently published articles in Phys. Rev. E in the Table of Content section "Computational physics"
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Efficient lattice Boltzmann method for electrohydrodynamic solid-liquid phase change

Fri, 07/12/2019 - 10:00

Author(s): Kang Luo, Alberto T. Pérez, Jian Wu, Hong-Liang Yi, and He-Ping Tan

Melting in the presence of electrohydrodynamic (EHD) flow driven by the Coulomb force in dielectric phase change material is numerically studied. A model is developed for the EHD flow in the solid-liquid phase change process. The fully coupled equations including mechanical equations, electrical equ...

[Phys. Rev. E 100, 013306] Published Fri Jul 12, 2019

Lanczos-boosted numerical linked-cluster expansion for quantum lattice models

Thu, 07/11/2019 - 10:00

Author(s): Krishnakumar Bhattaram and Ehsan Khatami

Numerical linked-cluster expansions allow one to calculate finite-temperature properties of quantum lattice models directly in the thermodynamic limit through exact solutions of small clusters. However, full diagonalization is often the limiting factor for these calculations. Here we show that a par...

[Phys. Rev. E 100, 013305] Published Thu Jul 11, 2019

Computing resonant modes of circular cylindrical resonators by vertical mode expansions

Mon, 07/08/2019 - 10:00

Author(s): Hualiang Shi and Ya Yan Lu

Open subwavelength cylindrical resonators of finite height are widely used in various photonics applications. Circular cylindrical resonators are particularly important in nanophotonics, since they are relatively easy to fabricate and can be designed to exhibit different resonance effects. In this p...

[Phys. Rev. E 100, 013303] Published Mon Jul 08, 2019

Direct-forcing fictitious domain method for simulating non-Brownian active particles

Mon, 07/08/2019 - 10:00

Author(s): Zhaowu Lin and Tong Gao

We present a direct-forcing fictitious domain method for simulating non-Brownian squirmer particles with both the hydrodynamic interactions and collisions being fully resolved. In this method, we solve the particle motion by distributing collocation points inside the particle interior domain that ov...

[Phys. Rev. E 100, 013304] Published Mon Jul 08, 2019

Temperature-scaled collision process for the high-order lattice Boltzmann model

Tue, 07/02/2019 - 10:00

Author(s): Xuhui Li (李旭晖), Yangyang Shi (师羊羊), and Xiaowen Shan (单肖文)

We postulate that the relaxations of the distribution function in the lattice Boltzmann model should be self-similar under temperature scaling. Based on this postulation, a multiple-relaxation-time collision model in the relative, temperature-scaled reference frame is devised with Hermite expansion....

[Phys. Rev. E 100, 013301] Published Tue Jul 02, 2019

Monte Carlo algorithms are very effective in finding the largest independent set in sparse random graphs

Tue, 07/02/2019 - 10:00

Author(s): Maria Chiara Angelini and Federico Ricci-Tersenghi

The effectiveness of stochastic algorithms based on Monte Carlo dynamics in solving hard optimization problems is mostly unknown. Beyond the basic statement that at a dynamical phase transition the ergodicity breaks and a Monte Carlo dynamics cannot sample correctly the probability distribution in t...

[Phys. Rev. E 100, 013302] Published Tue Jul 02, 2019

Interaction pressure tensor on high-order lattice Boltzmann models for nonideal fluids

Fri, 06/28/2019 - 10:00

Author(s): C. S. From, E. Sauret, S. A. Galindo-Torres, and Y. T. Gu

In this work we address the application of pseudopotentials directly on high-order lattice Boltzmann models. We derive a general expression for the pressure tensor on high-order lattices considering all nonideal interactions, including intra- and intermolecular interactions, following the discrete l...

[Phys. Rev. E 99, 063318] Published Fri Jun 28, 2019

Multiparticle collision dynamics for tensorial nematodynamics

Fri, 06/28/2019 - 10:00

Author(s): Shubhadeep Mandal and Marco G. Mazza

In this work, the authors generalize the particle-based multiparticle collision dynamics method to describe nematic liquid crystals. Their results agree with the existing literature and point the way to tackling topics under current investigation such as swimmers in nematic liquid crystals.

[Phys. Rev. E 99, 063319] Published Fri Jun 28, 2019

Denoising scheme based on singular-value decomposition for one-dimensional spectra and its application in precision storage-ring mass spectrometry

Fri, 06/28/2019 - 10:00

Author(s): X. C. Chen, Yu. A. Litvinov, M. Wang, Q. Wang, and Y. H. Zhang

This work concerns noise reduction for one-dimensional spectra in the case that the signal is corrupted by an additive white noise. The proposed method starts with mapping the noisy spectrum to a partial circulant matrix. In virtue of singular-value decomposition of the matrix, components belonging ...

[Phys. Rev. E 99, 063320] Published Fri Jun 28, 2019

Mixed bounce-back boundary scheme of the general propagation lattice Boltzmann method for advection-diffusion equations

Thu, 06/27/2019 - 10:00

Author(s): Xiuya Guo, Zhenhua Chai, Shengyong Pang, Yong Zhao, and Baochang Shi

In this work, a mixed bounce-back boundary scheme of general propagation lattice Boltzmann (GPLB) model is proposed for isotropic advection-diffusion equations (ADEs) with Robin boundary condition, and a detailed asymptotic analysis is also conducted to show that the present boundary scheme for the ...

[Phys. Rev. E 99, 063316] Published Thu Jun 27, 2019

Simulating the nonlinear interaction of relativistic electrons and tokamak plasma instabilities: Implementation and validation of a fluid model

Thu, 06/27/2019 - 10:00

Author(s): V. Bandaru, M. Hoelzl, F. J. Artola, G. Papp, and G. T. A. Huijsmans

For the simulation of disruptions in tokamak fusion plasmas, a fluid model describing the evolution of relativistic runaway electrons and their interaction with the background plasma is presented. The overall aim of the model is to self-consistently describe the nonlinear coupled evolution of runawa...

[Phys. Rev. E 99, 063317] Published Thu Jun 27, 2019

Learning moment closure in reaction-diffusion systems with spatial dynamic Boltzmann distributions

Wed, 06/26/2019 - 10:00

Author(s): Oliver K. Ernst, Thomas M. Bartol, Terrence J. Sejnowski, and Eric Mjolsness

Many physical systems are described by probability distributions that evolve in both time and space. Modeling these systems is often challenging due to their large state space and analytically intractable or computationally expensive dynamics. To address these problems, we study a machine-learning a...

[Phys. Rev. E 99, 063315] Published Wed Jun 26, 2019

Fair sampling of ground-state configurations of binary optimization problems

Tue, 06/25/2019 - 10:00

Author(s): Zheng Zhu, Andrew J. Ochoa, and Helmut G. Katzgraber

Although many efficient heuristics have been developed to solve binary optimization problems, these typically produce correlated solutions for degenerate problems. Most notably, transverse-field quantum annealing—the heuristic employed in current commercially available quantum annealing machines—has...

[Phys. Rev. E 99, 063314] Published Tue Jun 25, 2019

Machine learning acceleration of simulations of Stokesian suspensions

Mon, 06/24/2019 - 10:00

Author(s): Gökberk Kabacaoğlu and George Biros

Particulate Stokesian flows describe the hydrodynamics of rigid or deformable particles in Stokes flows. Due to highly nonlinear fluid-structure interaction dynamics, moving interfaces, and multiple scales, numerical simulations of such flows are challenging and expensive. Here, we propose a generic...

[Phys. Rev. E 99, 063313] Published Mon Jun 24, 2019

Dynamic mode decomposition for multiscale nonlinear physics

Thu, 06/20/2019 - 10:00

Author(s): Daniel Dylewsky, Molei Tao, and J. Nathan Kutz

We present a data-driven method for separating complex, multiscale systems into their constituent timescale components using a recursive implementation of dynamic mode decomposition (DMD). Local linear models are built from windowed subsets of the data, and dominant timescales are discovered using s...

[Phys. Rev. E 99, 063311] Published Thu Jun 20, 2019

Tail-regression estimator for heavy-tailed distributions of known tail indices and its application to continuum quantum Monte Carlo data

Thu, 06/20/2019 - 10:00

Author(s): Pablo López Ríos and Gareth J. Conduit

Standard statistical analysis is unable to provide reliable confidence intervals on expectation values of probability distributions that do not satisfy the conditions of the central limit theorem. We present a regression-based estimator of an arbitrary moment of a probability distribution with power...

[Phys. Rev. E 99, 063312] Published Thu Jun 20, 2019

Deep neural networks for classifying complex features in diffraction images

Wed, 06/19/2019 - 10:00

Author(s): Julian Zimmermann, Bruno Langbehn, Riccardo Cucini, Michele Di Fraia, Paola Finetti, Aaron C. LaForge, Toshiyuki Nishiyama, Yevheniy Ovcharenko, Paolo Piseri, Oksana Plekan, Kevin C. Prince, Frank Stienkemeier, Kiyoshi Ueda, Carlo Callegari, Thomas Möller, and Daniela Rupp

Intense short-wavelength pulses from free-electron lasers and high-harmonic-generation sources enable diffractive imaging of individual nanosized objects with a single x-ray laser shot. The enormous data sets with up to several million diffraction patterns present a severe problem for data analysis ...

[Phys. Rev. E 99, 063309] Published Wed Jun 19, 2019

Phase-field-theory-based lattice Boltzmann equation method for $N$ immiscible incompressible fluids

Wed, 06/19/2019 - 10:00

Author(s): Lin Zheng and Song Zheng

From the phase field theory, we develop a lattice Boltzmann equation (LBE) method for N (N≥2) immiscible incompressible fluids, and the Cahn-Hilliard equation, which could capture the interfaces between different phases, is also solved by LBE for an N-phase system. In this model, the interface force...

[Phys. Rev. E 99, 063310] Published Wed Jun 19, 2019

Near-field thermal emission by periodic arrays

Tue, 06/18/2019 - 10:00

Author(s): Sheila Edalatpour

Near-field thermal emission can be engineered by using periodic arrays of subwavelength emitters. The array thermal emission is dependent on the shape, size, and material properties of the individual elements as well as the period of the array. Designing periodic arrays with desired properties requi...

[Phys. Rev. E 99, 063308] Published Tue Jun 18, 2019

Coupled molecular-dynamics and finite-element-method simulations for the kinetics of particles subjected to field-mediated forces

Mon, 06/17/2019 - 10:00

Author(s): Michele Cascio, Davide Baroli, Stephane Bordas, Ioannis Deretzis, Giuseppe Falci, Antonino Magliano, and Antonino La Magna

A computational approach that couples molecular-dynamics (MD) and the-finite-element-method (FEM) technique is here proposed for the theoretical study of the dynamics of particles subjected to electromechanical forces. The system consists of spherical particles (modeled as micrometric rigid bodies w...

[Phys. Rev. E 99, 063307] Published Mon Jun 17, 2019

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