Xiao-Peng Chen

Xiao-Peng Chen
Northwestern Polytechnical University | NWPU · Department of Engineering Mechanics

PhD

About

36
Publications
4,660
Reads
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447
Citations
Introduction
I'm now working on bubble dynamics, lattice Boltzmann simulation and moving contact line problems
Additional affiliations
May 2006 - present
Northwestern Polytechnical University
Position
  • Professor
May 2006 - present
Northwestern Polytechnical University
Position
  • Professor

Publications

Publications (36)
Preprint
Full-text available
A focused jet is generated from a concave free surface through an impact of a tube. Experimental and numerical studies were conducted to explore the viscous influences. The results show that a strong vorticity sheet is generated along the free surface just after impact, and the liquid bulk is initialized ($t\le$$10^{-4}$s). After the impact, the li...
Article
Full-text available
By impacting a concave dual-layer liquid (with the oil and the dyed water) surface in a test tube, a compound jet with a water core and an oil shell is generated. The velocities of the jet’s head ($V_j$) and the oil-water interface ($V_j^'$) are experimentally determined against the initial thickness and the viscosity of the upper layer liquid. The...
Article
Full-text available
Wetting states and processes attract plenty of interest of scientific and industrial societies. Air entrainment, i.e., wetting failure, on smooth plate in wetting process has been investigated carefully before. Liquid bath entries of "rough" silicon wafers are studied experimentally in the present work, and the air entrainment condition is analyzed...
Article
An extremely thin gas film was found between a sphere and a free surface when the sphere impacted onto a water pool. That might influence the generation and evolution of water entry cavity. However, it is quite difficult to be captured through normal numerical and experimental tests. In this work, by using a finite element method we investigate the...
Article
We conducted experimental and numerical studies on the vibrating modes of a dragon wash basin (DWB) and the free surface waves inside the DWB. Both the vibration of the DWB and the sound produced were studied carefully. It was found that the DWB can be excited at different intrinsic modes under different excitation, including striking and rubbing i...
Article
A two-dimensional drop sliding down a plate under the action of gravity is numerically studied. A lattice Boltzmann method coupled with the phase field method is utilized, which can well capture the motion of the three-phase contact line. The morphologies of the sliding drop and corresponding force balance during the process are considered. It is f...
Article
Full-text available
Drops impacting on a flat solid surface will spread until it reaches maximum contact with the substrate underneath. After that, it recoils. In the present work, the variations of energy components during the spreading are studied carefully, including kinetic, capillary, and dissipated energies. Our experimental and numerical results show that, when...
Article
In this work, we investigate how surface roughness influences contact line dynamics by simulating forced wetting in a capillary tube. The tube wall is decorated with microgrooves and is intrinsically hydrophilic. A phase-field method is used to capture the fluid interface and the moving contact line. According to the numerical results, a criterion...
Article
We present a numerical study of a moving contact line (CL) crossing the intersecting region of hydrophilic and hydrophobic patterns on a solid wall using lattice Boltzmann methods (LBMs). To capture the interface between the two phases properly, we applied a phase field model coupled with the LBM. The evolutions of the CL velocity, dynamic contact...
Article
In this paper, a method that combines the characteristic-based split finite element method (CBS-FEM) and the direct forcing immersed boundary (IB) method is proposed for the simulation of incompressible viscous flows. The structured triangular meshes without regarding the location of the physical boundary of the body is adopted to solve the flow, a...
Article
Acoustic waves (or oscillating flows) cause both periodic flow and steady streaming around an obstacle. The nonlinear characteristic of such flows further induces acoustic radiation forces exerting on the surface of the obstacle, which is efficient to levitate or manipulate small partials. Two dimensional lattice Boltzmann methods are applied to si...
Article
Full-text available
Homogeneous equilibrium model (HEM) has been widely used in cavitating flow simulations. The major feature of this model is that a single equation of state (EOS) is proposed to describe the thermal behavior of bubbly liquid, where both kinematic and thermal equilibrium is assumed between two phases. In this paper, the HEM was coupled with multi-rel...
Article
We develop a two-dimensional model to study the effects of the material viscoelasticity on the dynamics of a flag in flow. Two periodic states of an elastic flag are firstly identified with different dimensionless bending stiffness: a lower frequency state and a higher frequency state. The Scott–Blair model and the fractional Kelvin–Voigt model are...
Article
Full-text available
Wetting failure is of vital importance to many physical phenomena, such as industrial coating and drop emission. Here we show when and how the surface roughness promotes the destabilization of a moving contact line on a hydrophilic surface. Beyond the balance of the driving force and viscous resistance where a stable wetting interface is sustained,...
Article
Full-text available
Lattice Boltmzann method (LBM) has been developed as an important technique of computational fluid mechanics. Two-dimensional turbulent flow around NACA0012 airfoil, with Re=105 and AOA=4○ (angle of attack), is simulated with “multiple-relaxation time” lattice Boltzmann method incorporated with Spalart-Allmaras (SA) turbulence model. From the viewp...
Article
A combined method is proposed to determine the water entry acceleration at a low impact velocity through image processing. The procedure includes: (1) a sequence of images for water impact are recorded by a high speed camera, (2) the sub-pixel image processing method is employed to calculate the displacement with an accuracy on the “sub-pixel” leve...
Article
The wall-adapting local eddy-viscosity (WALE) and Vreman subgrid scale models for large eddy simulations are compared within the framework of a generalised lattice Boltzmann method. Fully developed turbulent flows near a flat wall are simulated with the two models for the shear (or friction) Reynolds number of 183.6. Compared to the direct numerica...
Article
Flow around a moving cylinder was simulated with interpolated bounce back scheme using the frame of multi-relaxation time lattice Boltzmann method. The flow variables on newly generated fluid grid due to cylinder moving were estimated with non-equilibrium extrapolation method: the density distributing populations were calculated according to cylind...
Article
In order to solve compressible turbulent flow problems, this study focuses on incorporating the Spalart–Allmaras turbulence model into gas-kinetic BGK (Bhatnagar–Gross–Krook) scheme. The Spalart–Allmaras turbulence model is solved using finite difference discretization. The variables on the cell interface are interpolated via the van Leer limiter i...
Article
From the point of comprehensive economic, this article established a distribution transformer capacity optimization model. The model is expressed by aimed at minimum sum of transformer life cycle costs and the planning capacity investment cost of higher power grid, constraints in power supply reliability. Fit the scatter of the relationship between...
Article
Numerical treatment of engineering application problems often eventually results in a solution of systems of linear or nonlinear equations. The solution process using digital computational devices usually takes tremendous time due to the extremely large size encountered in most real-world engineering applications. So, practical solvers for systems...
Article
Natural cavitation is defined as the formation of vapor bubbles in a flow due to the pressure falling below the liquid’s vapor pressure. The inception of the cavitation bubble is influenced by a lot of aspects, such as impurities, turbulence, liquid thermal properties, etc. In this paper, the exact difference method (EDM) and the Carnahan–Starling...
Article
Full-text available
In most of the emergency circumstances, the aircrew leaves the aircraft under unsatisfied conditions, such as too high relative velocity to the ambient air or low partial oxygen pressure. The aircrew must pass through this area as quickly as possible before opening the parachute safely, viz., free-fall. Numerical simulations are conducted in this p...
Article
Full-text available
The main goal of this paper is to develop the coupled double- distributionfunction (DDF) lattice Boltzmann method (LBM) for simulation of subsonic and transonic turbulent flows. In the present study, we adopt the second-order implicit-explicit (IMEX) Runge-Kutta schemes for time discretization and theNon-Oscillatory andNon- Free-Parameters Dissipat...
Article
To improve the efficiency and accuracy of simulating complex flow phenomena, an accelerated algorithm of Lattice-Boltzmann method based on CUDA on multi-GPUs desktop platform is proposed. The computational space is evenly divided into cells, which compose multiple sub-domains in accordance with the number of available GPUs. Each GPU stores only the...
Article
This article presents a method for the numerical solution of compressible viscid and inviscid flow with two dimensional body-fitted grids based on an improved gas-kinetic BGK (Bhatnagaar-Gross-Krook) scheme. This method has been improved in flux computation on a non-uniform grid. In the reconstruction stage, four cells around the cell interface are...
Article
Mn-doped ZnO nanorods (composition: Mn0.046Zn0.954O) were grown by a simple solvothermal technique. The morphological, structural and optical properties of the as-prepared nanorods were investigated by means of transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and photoluminescence. The results s...
Article
Zinc oxide polycrystalline films were prepared by electrostatic spray deposition using the dispersions of zinc oxide nanocrystals as solution precursors for ultraviolet luminescence device applications. The structure and properties of the films were studied by X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy and...
Article
Full-text available
Natural cavitation is defined as the phenomenon of the formation of vapor bubbles in a flow due to the pressure falls below the liquid's vapor pressure. The inception of the cavitation bubble is influenced by many factors, such as impurities, turbulence, liquid thermal properties etc. In this paper, we simulate a 2D cavitation "bubble" growth under...
Article
Flow focusing normally refers to two immiscible liquids (phase 1 and 2) are extracted into a small orifice while the liquid interface pinches off due to capillary instability or forces balance among driven pressure, interfacial tension etc [1]. The idea stimulated a mass of studies of flow focusing in microchannels [2], which show excellent control...

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Projects (2)
Project
Jetting process and droplet generation play key roles in various applications, where inkjet printing is the most significant one. We focused on the physics of jet generation and pinch-off process, which can provide theoretical fundamental for preparing droplets, etc.