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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Density gradient calculation in a class of multiphase lattice Boltzmann models

Mon, 10/21/2019 - 10:00

Author(s): Rongzong Huang, Huiying Wu, and Nikolaus A. Adams

The multiphase lattice Boltzmann (LB) models based on pairwise interactions show great potential for simulating multiphase flows due to the conceptual and computational simplicity. Although the dynamics of multiphase flows are reproduced by the pairwise interaction force, the gradient of density (or...

[Phys. Rev. E 100, 043306] Published Mon Oct 21, 2019

Axisymmetric compact finite-difference lattice Boltzmann method for blood flow simulations

Mon, 10/21/2019 - 10:00

Author(s): M. Sakthivel and Kameswararao Anupindi

An axisymmetric compact finite-difference lattice Boltzmann method is proposed to simulate both Newtonian and non-Newtonian flow of blood through a lumen. The curvature of the arteries could be accurately resolved using body-fitted mesh owing to the proposed finite-difference formulation. The axisym...

[Phys. Rev. E 100, 043307] Published Mon Oct 21, 2019

Conserved discrete unified gas-kinetic scheme with unstructured discrete velocity space

Fri, 10/18/2019 - 10:00

Author(s): Jianfeng Chen, Sha Liu, Yong Wang, and Chengwen Zhong

Discrete unified gas-kinetic scheme (DUGKS) is a multiscale numerical method for flows from continuum limit to free molecular limit, and is especially suitable for the simulation of multiscale flows, benefiting from its multiscale property. To reduce integration error of the DUGKS and ensure the con...

[Phys. Rev. E 100, 043305] Published Fri Oct 18, 2019

Efficient simulation protocol for determining the density of states: Combination of replica-exchange Wang-Landau method and multicanonical replica-exchange method

Thu, 10/17/2019 - 10:00

Author(s): Takuya Hayashi and Yuko Okamoto

By combining two generalized-ensemble algorithms, the replica-exchange Wang-Landau (REWL) method and the multicanonical replica-exchange method (MUCAREM), we propose an effective simulation protocol to determine the density of states with high accuracy. The new protocol is referred to as REWL-MUCARE...

[Phys. Rev. E 100, 043304] Published Thu Oct 17, 2019

Modeling cell migration regulated by cell extracellular-matrix micromechanical coupling

Fri, 10/11/2019 - 10:00

Author(s): Yu Zheng, Hanqing Nan, Yanping Liu, Qihui Fan, Xiaochen Wang, Ruchuan Liu, Liyu Liu, Fangfu Ye, Bo Sun, and Yang Jiao

Cell migration in fibrous extracellular matrix (ECM) is crucial to many physiological and pathological processes such as tissue regeneration, immune response, and cancer progression. During migration, individual cells can generate active pulling forces via actomyosin contraction, which are transmitt...

[Phys. Rev. E 100, 043303] Published Fri Oct 11, 2019

Hybridized method of pseudopotential lattice Boltzmann and cubic-plus-association equation of state assesses thermodynamic characteristics of associating fluids

Fri, 10/04/2019 - 10:00

Author(s): Mohammad Bagher Asadi and Sohrab Zendehboudi

It is crucial to properly describe the associating fluids in terms of phase equilibrium behaviors, which are needed for design, operation, and optimization of various chemical and energy processes. Pseudopotential lattice Boltzmann method (LBM) appears to be a reliable and efficient approach to stud...

[Phys. Rev. E 100, 043302] Published Fri Oct 04, 2019

Self-learning projective quantum Monte Carlo simulations guided by restricted Boltzmann machines

Wed, 10/02/2019 - 10:00

Author(s): S. Pilati, E. M. Inack, and P. Pieri

The projective quantum Monte Carlo (PQMC) algorithms are among the most powerful computational techniques to simulate the ground-state properties of quantum many-body systems. However, they are efficient only if a sufficiently accurate trial wave function is used to guide the simulation. In the stan...

[Phys. Rev. E 100, 043301] Published Wed Oct 02, 2019

Implicit atomistic viscosities in smoothed dissipative particle dynamics

Mon, 09/30/2019 - 10:00

Author(s): Morgane Borreguero, Deniz Bezgin, Stefan Adami, and Nikolaus A. Adams

We apply a standard nonequilibrium dynamics microscopic analysis of transport coefficients to the smoothed dissipative particle dynamics (SDPD) method of steady-shear flow conditions. Extending the research of Ellero et al. [Phys. Rev. E 82, 046702 (2010)] for smoothed particle hydrodynamics (SPH), ...

[Phys. Rev. E 100, 033318] Published Mon Sep 30, 2019

Laser speckle imaging of flowing blood: A numerical study

Thu, 09/26/2019 - 10:00

Author(s): Kevin van As, Jorne Boterman, Chris R. Kleijn, Sasa Kenjeres, and Nandini Bhattacharya

Laser speckle imaging can be used to study dynamic processes in turbid media, such as blood flow embedded in tissue, but it is difficult to obtain quantitative information from this technique. This paper presents a computational model for simulating the imaging process, which will be useful to further develop it as a quantitative tool for biomedical and other applications.

[Phys. Rev. E 100, 033317] Published Thu Sep 26, 2019

Tight focusing of electromagnetic fields by large-aperture mirrors

Wed, 09/25/2019 - 10:00

Author(s): D. E. Shipilo, I. A. Nikolaeva, V. Yu. Fedorov, S. Tzortzakis, A. Couairon, N. A. Panov, and O. G. Kosareva

We derive nonparaxial input conditions for simulations of tightly focused electromagnetic fields by means of unidirectional nonparaxial vectorial propagation equations. The derivation is based on the geometrical optics transfer of the incident electric field from significantly curved reflecting surf...

[Phys. Rev. E 100, 033316] Published Wed Sep 25, 2019

Phase-field-based lattice Boltzmann model for liquid-gas-solid flow

Tue, 09/24/2019 - 10:00

Author(s): Qiang He, Yongjian Li, Weifeng Huang, Yang Hu, and Yuming Wang

Based on phase-field theory, we develop a lattice Boltzmann (LB) model for liquid-gas-solid flow from multiphase and particle dynamics algorithms. A modified bounce-back method is developed for the velocity-based LB approach. A curved boundary treatment with second-order accuracy based on velocity i...

[Phys. Rev. E 100, 033314] Published Tue Sep 24, 2019

Development of multicomponent lattice Boltzmann flux solver for simulation of compressible viscous reacting flows

Tue, 09/24/2019 - 10:00

Author(s): Tianpeng Yang, Jiangfeng Wang, Liming Yang, and Chang Shu

In this paper, the multicomponent lattice Boltzmann flux solver (LBFS) is developed for simulation of two-dimensional compressible viscous reacting flows. This work is based on the existing LBFS for simulation of single-component compressible flows. The present solver applies the finite volume metho...

[Phys. Rev. E 100, 033315] Published Tue Sep 24, 2019

Model discovery for studies of surface morphological modifications based on Kuramoto-Sivashinsky dynamics

Mon, 09/23/2019 - 10:00

Author(s): D. Reiser

A wide range of observations in studies of surfaces exposed to ion beams can be explained and analyzed successfully by continuum models of the Kuramoto-Sivashinsky type. Despite certain progress in the theoretical understanding of the model parameters on the basis of atomistic models, much of the ap...

[Phys. Rev. E 100, 033312] Published Mon Sep 23, 2019

Lattice Boltzmann method for thin-liquid-film hydrodynamics

Mon, 09/23/2019 - 10:00

Author(s): S. Zitz, A. Scagliarini, S. Maddu, A. A. Darhuber, and J. Harting

We propose an approach to the numerical simulation of thin-film flows based on the lattice Boltzmann method. We outline the basic features of the method, show in which limits the expected thin-film equations are recovered, and perform validation tests. The numerical scheme is applied to the viscous ...

[Phys. Rev. E 100, 033313] Published Mon Sep 23, 2019

Toward an artificial intelligence physicist for unsupervised learning

Thu, 09/19/2019 - 10:00

Author(s): Tailin Wu and Max Tegmark

We investigate opportunities and challenges for improving unsupervised machine learning using four common strategies with a long history in physics: divide and conquer, Occam's razor, unification, and lifelong learning. Instead of using one model to learn everything, we propose a paradigm centered a...

[Phys. Rev. E 100, 033311] Published Thu Sep 19, 2019

Conservative discrete-velocity method for the ellipsoidal Fokker-Planck equation in gas-kinetic theory

Wed, 09/18/2019 - 10:00

Author(s): Sha Liu, Ruifeng Yuan, Usman Javid, and Chengwen Zhong

A conservative discrete velocity method (DVM) is developed for the ellipsoidal Fokker-Planck (ES-FP) equation in prediction of nonequilibrium neutral gas flows in this paper. The ES-FP collision operator is solved in discrete velocity space in a concise and quick finite difference framework. The con...

[Phys. Rev. E 100, 033310] Published Wed Sep 18, 2019

Mesoscale simulation of soft particles with tunable contact angle in multicomponent fluids

Tue, 09/17/2019 - 10:00

Author(s): Maarten Wouters, Othmane Aouane, Timm Krüger, and Jens Harting

Soft particles at fluid interfaces play an important role in many aspects of our daily life, such as the food industry, paints and coatings, and medical applications. Analytical methods are not capable of describing the emergent effects of the complex dynamics of suspensions of many soft particles, ...

[Phys. Rev. E 100, 033309] Published Tue Sep 17, 2019

Reconstruction of porous media from extremely limited information using conditional generative adversarial networks

Mon, 09/16/2019 - 10:00

Author(s): Junxi Feng, Xiaohai He, Qizhi Teng, Chao Ren, Honggang Chen, and Yang Li

Porous media are ubiquitous in both nature and engineering applications. Therefore, their modeling and understanding is of vital importance. In contrast to direct acquisition of three-dimensional (3D) images of this type of medium, obtaining its subregion (s) such as 2D images or several small areas...

[Phys. Rev. E 100, 033308] Published Mon Sep 16, 2019

Modeling of nonequilibrium surface growth by a limited-mobility model with distributed diffusion length

Thu, 09/12/2019 - 10:00

Author(s): Thomas Martynec and Sabine H.L. Klapp

Kinetic Monte Carlo (KMC) simulations are a well-established numerical tool to investigate the time-dependent surface morphology in molecular beam epitaxy experiments. In parallel, simplified approaches such as limited mobility (LM) models characterized by a fixed diffusion length have been studied....

[Phys. Rev. E 100, 033307] Published Thu Sep 12, 2019

Explicit and viscosity-independent immersed-boundary scheme for the lattice Boltzmann method

Wed, 09/11/2019 - 10:00

Author(s): Simon Gsell, Umberto D'Ortona, and Julien Favier

Viscosity independence of lattice-Boltzmann methods is a crucial issue to ensure the physical relevancy of the predicted macroscopic flows over large ranges of physical parameters. The immersed-boundary (IB) method, a powerful tool that allows one to immerse arbitrary-shaped, moving, and deformable ...

[Phys. Rev. E 100, 033306] Published Wed Sep 11, 2019

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