Aiguo Xu

Institute of Applied Physics and Computational Mathematics

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Guangcai Zhang

Southeast University

Yanbiao Gan

North China Institute of Aerospace Engineering

Yingjun Li

China University of Mining and Technology

Feng Chen

Shandong Jiaotong University

Yudong Zhang

North University of China

Chuandong Lin

Tsinghua University

Yudong Zhang

Zhengzhou University

Huilin Lai

Fujian Normal University

A Shayan

Australian Road Research Board

Guangrui Wang

Chinese Academy of Medical Sciences & Peking Union Medical College

Cooperative Institutions

Institute of Applied Physics and Computational Mathematics

Chinese Academy of Sciences

Peking University

Shanghai Jiao Tong University

Tsinghua University

Zhejiang University

Beijing Institute of Technology

China University of Mining and Technology

Chinese Academy of Medical Sciences & Peking Union Medical College

University of Chinese Academy of Sciences

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Attractive and repulsive contributions of localized excitability inhomogeneities and elimination of spiral waves in excitable media

Physical Review E (2013)

Guoyong Yuan Huan Zhang Aiguo Xu Guangrui Wang

The attracting and repelling of spiral waves in a two-dimensional excitable medium in the presence of localized excitability inhomogeneities are studied. The choice of two effects depends on the comparison of excitabilities inside and outside the localized obstacle. We inspect the changes in attracting and repelling behaviors with respect to the size of the obstacle and the initial distance between the center of the spiral core and the obstacle. To understand the occurrence of these phenomena, we investigated the small v-value areas near the tip and the function of the wave velocity as the excitability parameter ε. Considering the attributes of the attractive obstacle, an eliminating scheme of spiral waves is proposed in which the attractive obstacle is rapidly moved at several fixed times. This method can avoid the high-amplitude and high-frequency stimulus in most conventional methods.

Spiral wave

Stimulus (psychology)

10.1103/physreve.88.022920

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Citations (16)

Control of spiral-wave dynamics using feedback signals from line detectors

EPL (Europhysics Letters) (2010)

Guoyong Yuan Aiguo Xu Guangrui Wang Shigang Chen

We numerically study trajectories of spiral-wave-cores in excitable systems modulated proportionally to the integral of the activity on the straight line, several or dozens of equi-spaced measuring points on the straight line, the double-line and the contour-line. We show the single-line feedback results in the drift of core center along a straight line being parallel to the detector. An interesting finding is that the drift location in $y$ is a piecewise linear-increasing function of both the feedback line location and time delay. Similar trajectory occurs when replacing the feedback line with several or dozens of equi-spaced measuring points on the straight line. This allows to move the spiral core to the desired location along a chosen direction by measuring several or dozens of points. Under the double-line feedback, the shape of the tip trajectory representing the competition between the first and second feedback lines is determined by the distance of two lines. Various drift attractors in spiral wave controlled by square-shaped contour-line feedback are also investigated. A brief explanation is presented.

Line (geometry)

Line segment

Single line

10.1209/0295-5075/90/10013

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Citations (18)

Phase diagrams of two generalized FK models

Physics Letters A (1997)

Aiguo Xu Guangrui Wang X. T. He Bambi Hu

10.1016/s0375-9601(97)00431-3

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Citations (3)

A multi-feature predicting model of crown evolution involving material properties

AIP Advances (2022)

Tianyu Ma Yanchuang Cao Jun Liu Aiguo Xu Jie Chen

We propose a new model for the crown evolution after a single drop impacts on a thin film. In contrast with the existing models that mainly focus on the status of well-developed crown or the bottom radius evolution, multiple features are provided in our model, including the temporal evolution of the crown radius, height, velocity, and the characteristic time when the crown reaches its maximum height. Both the fluid viscosity and surface tension are considered in this work rather than ignoring one or both of them as in previous studies, resulting in improved accuracy for crown development prediction. The new model can be applied for droplets of various fluids impinging on relatively thin films (0.1 < δ < 0.67). The reliability of the model is validated via comparing results with five cases of droplet impact experiments.

Feature (linguistics)

10.1063/5.0086420

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Prandtl number effects in MRT lattice Boltzmann models for shocked and unshocked compressible fluids

Theoretical and Applied Mechanics Letters (2011)

Feng Chen Aiguo Xu Guangcai Zhang Yingjun Li

This paper constructs a new multiple relaxation time lattice Boltzmann model which is not only for the shocked compressible fluids, but also for the unshocked compressible fluids. To make the model work for unshocked compressible fluids, a key step is to modify the collision operators of energy flux so that the viscous coefficient in momentum equation is consistent with that in energy equation even in the unshocked system. The unnecessity of the modification for systems under strong shock is analyzed. The model is validated by some well-known benchmark tests, including thermal Couette flow, Riemann problem. The first system is unshocked and the latter is shocked. In both systems, the Prandtl number effects are checked. Satisfying agreements are obtained between new model results and analytical ones.

Lattice Boltzmann methods

10.1063/2.1105204

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Citations (9)

Lattice Boltzmann model for combustion and detonation

Frontiers of Physics (2013)

Bo Yan Aiguo Xu Guangcai Zhang Yangjun Ying Hua Li

Lattice Boltzmann methods

10.1007/s11467-013-0286-z

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Citations (68)

Hepatitis B surface antigen (HBsAg) and core antigen (HBcAg) combine CpG oligodeoxynucletides as a novel therapeutic vaccine for chronic hepatitis B infection

Vaccine (2015)

Jianqiang Li Junwei Ge Sulin Ren Tong Zhou Ying Sun

HBcAg

Hepatitis B

10.1016/j.vaccine.2015.03.079

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Citations (36)

Simulation study on cavity growth in ductile metal materials under dynamic loading

Frontiers of Physics (2013)

Aiguo Xu Guangcai Zhang Yangjun Ying Xijun Yu

Coalescence (physics)

Free surface

10.1007/s11467-013-0348-2

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Citations (1)

Discrete Boltzmann trans-scale modeling of high-speed compressible flows

Physical review. E (2018)

Yanbiao Gan Aiguo Xu Guangcai Zhang Yudong Zhang Sauro Succi

We present a general framework for constructing trans-scale discrete Boltzmann models (DBMs) for high-speed compressible flows ranging from continuum to transition regime. This is achieved by designing a higher-order discrete equilibrium distribution function that satisfies additional nonhydrodynamic kinetic moments. To characterize the thermodynamic nonequilibrium (TNE) effects and estimate the condition under which the DBMs at various levels should be used, two measures are presented: (i) the relative TNE strength, describing the relative strength of the (N+1)th order TNE effects to the Nth order one; (ii) the TNE discrepancy between DBM simulation and relevant theoretical analysis. Whether or not the higher-order TNE effects should be taken into account in the modeling and which level of DBM should be adopted is best described by the relative TNE intensity and/or the discrepancy rather than by the value of the Knudsen number. As a model example, a two-dimensional DBM with 26 discrete velocities at Burnett level is formulated, verified, and validated.

Boltzmann constant

10.1103/physreve.97.053312

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Citations (77)

Discrete Boltzmann Method with Maxwell-Type Boundary Condition for Slip Flow

Communications in Theoretical Physics (2018)

Yudong Zhang Aiguo Xu Guangcai Zhang Zhihua Chen

The rarefied effect of gas flow in microchannel is significant and cannot be well described by traditional hydrodynamic models. It has been known that discrete Boltzmann model (DBM) has the potential to investigate flows in a relatively wider range of Knudsen number because of its intrinsic kinetic nature inherited from Boltzmann equation. It is crucial to have a proper kinetic boundary condition for DBM to capture the velocity slip and the flow characteristics in the Knudsen layer. In this paper, we present a DBM combined with Maxwell-type boundary condition model for slip flow. The tangential momentum accommodation coefficient is introduced to implement a gas-surface interaction model. Both the velocity slip and the Knudsen layer under various Knudsen numbers and accommodation coefficients can be well described. Two kinds of slip flows, including Couette flow and Poiseuille flow, are simulated to verify the model. To dynamically compare results from different models, the relation between the definition of Knudsen number in hard sphere model and that in BGK model is clarified.

Lattice Boltzmann methods

10.1088/0253-6102/69/1/77

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Citations (28)