A5100694019- Fluid Dynamics Simulations and Interactions
- Laser-Plasma Interactions and Diagnostics
- Advanced Machining and Optimization Techniques
- Advanced Surface Polishing Techniques
- Numerical methods in engineering
- Structural Health Monitoring Techniques
- Computational Geometry and Mesh Generation
- Structural Engineering and Vibration Analysis
- Railway Engineering and Dynamics
- Advanced machining processes and optimization
- Particle Accelerators and Free-Electron Lasers
- 3D Shape Modeling and Analysis
- Particle accelerators and beam dynamics
- Lattice Boltzmann Simulation Studies
- Advanced Numerical Analysis Techniques
- Fatigue and fracture mechanics
- Space Technology and Applications
- Aluminum Alloy Microstructure Properties
- Fluid Dynamics and Heat Transfer
- Railway Systems and Energy Efficiency
- Pancreatitis Pathology and Treatment
- Elasticity and Material Modeling
- Geotechnical Engineering and Underground Structures
- Mechanical stress and fatigue analysis
- Computer Graphics and Visualization Techniques
Shanghai University of Engineering Science
2009-2024
University of Pennsylvania
2020-2023
University of California, Los Angeles
2021-2023
University of America
2023
Tsinghua University
2009-2021
Adobe Systems (United States)
2021
California University of Pennsylvania
2019-2020
Hunan Provincial People's Hospital
2020
Harbin Institute of Technology
2002-2016
Hunan City University
2016
In this paper, we introduce the Moving Least Squares Material Point Method (MLS-MPM). MLS-MPM naturally leads to formulation of Affine Particle-In-Cell (APIC) [Jiang et al. 2015] and Polynomial [Fu 2017] in a way that is consistent with Galerkin-style weak form discretization governing equations. Additionally, it enables new stress divergence effortlessly allows all MPM simulations run two times faster than before. We also develop Compatible (CPIC) algorithm on top MLS-MPM. Utilizing colored...
We present two new approaches for animating dynamic fracture involving large elastoplastic deformation. In contrast to traditional mesh-based techniques, where sharp discontinuity is introduced split the continuum at crack surfaces, our methods are based on Continuum Damage Mechanics (CDM) with a variational energy-based formulation evolution. Our first approach formulates resulting material damage evolution Ginzburg-Landau type phase-field equation and discretizes it Material Point Method...
Harnessing the power of modern multi-GPU architectures, we present a massively parallel simulation system based on Material Point Method (MPM) for simulating physical behaviors materials undergoing complex topological changes, self-collision, and large deformations. Our makes three critical contributions. First, introduce new particle data structure that promotes coalesced memory access patterns GPU eliminates need atomic operations hierarchy when writing to grid. Second, propose kernel...
Background: Hypertriglyceridemia (HTG) is the most common etiology of acute pancreatitis (AP) after alcohol and gallstone-induced disease. Elevation serum triglyceride (TG) levels to ≥1000 mg/dl in a patient with AP strongly indicates HTG as cause. The absolute risk based on TG ≤1000 has not been clearly defined. aims this study were address role elevated between 500 1000 clinical course (HTGP); assess relationship level disease severity. Methods: A total 224 HTGP patients 2007 2011 divided...
Simulating viscoelastic polymers and polymeric fluids requires a robust accurate capture of elasticity viscosity. The computation is known to become very challenging under large deformations high Drawing inspirations from return mapping based elastoplasticity treatment for granular materials, we present finite strain integration scheme general solids arbitrarily deformation non-equilibrated flow. Our on predictor-corrector exponential the principal strains gradient, which closely resembles...
Dynamic fracture surrounds us in our day-to-day lives, but animating this phenomenon is notoriously difficult and only further complicated by anisotropic materials---those with underlying structures that dictate preferred directions. Thus, we present AnisoMPM: a robust general approach for the dynamic of isotropic, transversely orthotropic materials. AnisoMPM has three core components: technique damage evolution, methods elastic response, coupling approach. For damage, adopt non-local...
We propose a novel scheme for simulating two-way coupled interactions between nonlinear elastic solids and incompressible fluids. The key ingredient of this approach is ghost matrix operator-splitting strongly elastica fluids through the weak form their governing equations. This leads to stable efficient method handling large time steps under CFL limit while using single monolithic solve pressure fields, even in case with highly solids. use Material Point Method (MPM) essential designing...
We extend recent advances in the numerical time-integration of contacting elastodynamics [Li et al. 2020] to build a new framework, called Injective Deformation Processing (IDP), for robust solution wide range mesh deformation problems requiring injectivity. IDP solves challenging 3D (and 2D) geometry processing and animation tasks on meshes, via artificial time integration, with guarantees both non-inversion non-overlap. To our knowledge is first framework that can efficiently guarantee...
The temporal evolution of the magnetic field associated with electron thermal Weibel instability in optical-field ionized plasmas is measured using ultrashort (1.8 ps), relativistic (45 MeV) bunches from a linear accelerator. self-generated fields are found to self-organize into quasistatic structure consistent helicoid topology within few picoseconds and such lasts for tens underdense plasmas. growth rate agrees well that predicted by kinetic theory taking account collisions. Magnetic...
To overcome the contradiction between resolution and measurement cost, various algorithms for reconstructing sound field with sparse have been developed. However, limited attention is paid to computation efficiency. In this study, a fast reconstruction method proposed based on Bayesian compressive sensing. First, problem modeled by decomposition of via singular value decomposition. Then, sensing adapted reconstruct pressure. Numerical results demonstrate that applicable either spatially...
Abstract Spatially and temporally adaptive algorithms can substantially improve the computational efficiency of many numerical schemes in mechanics physics‐based animation. Recently, a crucial need for temporal adaptivity Material Point Method (MPM) is emerging due to potentially substantial variation material stiffness velocities multi‐material scenes. In this work, we propose novel symplectic Euler scheme MPM with regional time stepping (RTS), where different steps are used regions. We...
We propose Hierarchical Optimization Time Integration (HOT) for efficient implicit time-stepping of the Material Point Method (MPM) irrespective simulated materials and conditions. HOT is an MPM-specialized hierarchical optimization algorithm that solves nonlinear time step problems large-scale MPM systems near CFL-limit. provides convergent simulations "out-of-the-box" across widely varying computational resolutions without parameter tuning. As stepper accelerated by a custom-designed...
Plasma-based electron/positron wakefield acceleration has made great strides in the past decade. Currently, a major challenge to its application coherent light sources and linear colliders is relatively large beam-energy spread, dominated by energy chirp. The authors propose nearly ideal dechirper based on low-density hollow channel plasma reduce beam spread down 0.1% level or even lower, while maintaining emittance. This approach may significantly improve quality of plasma-based...
High-energy electron radiography is an emerging technique for imaging matter at high energy densities ($i.e.$ under extreme temperature and pressure) with spatiotemporal resolution, but its development hindered by the technical difficulty of creating advanced optics. This study explores combination state-of-the-art high-brightness sources innovative cascaded system to make progress on problem. Interestingly, spread source seems be main obstacle further improvement resolving power this technology.
Purpose The purpose of this paper is to introduce error ellipse into the bootstrap method improve reliability small samples and credibility S-N curve. Design/methodology/approach Based on original samples, two models are proposed. model reasonably predicts that discrete law expanded virtual obeys two-dimensional normal distribution. Findings By comparing parameters obtained by method, improved (normal distribution) methods, it found achieves expansion sampling range shortens confidence...
The vibration energy of the track slab can be converted into electric for wireless sensors by piezoelectric harvesters. A laminated circular plate harvester (TLCP harvester) is designed in this paper based on foundation excitation. central frequency 222 Hz, which matched with 222.8 Hz slab. stiffness curve, damping, equivalent capacitance, and electromechanical coupling coefficient are obtained through experiment. harmonic balance method Runge–Kutta's voltage results consistent experimental...
We propose an efficient cloth simulation method that combines the merits of two drastically different numerical procedures, namely subspace integration and parallelizable iterative relaxation. show those methods can be organically coupled within framework projective dynamics (PD), where both low- high-frequency motions are effectively efficiently computed. Our works seamlessly with state-of-the-art contact handling algorithm, incremental potential (IPC), to offer non-penetration guarantee...
High-energy electron radiography (HEER) is a promising diagnostic tool for high-energy-density physics, as an alternative to tools such X/γ-ray shadowgraphy and high-energy proton radiography. Impressive progress has been made in the development application of HEER past few years, its potential high-resolution imaging static opaque objects proved. In this study, by taking advantage short pulse duration tunable time structure probes, time-resolved measurements gold irradiated ultrashort...
We propose a novel asynchronous time integration scheme for the Material Point Method (MPM), which offers temporal adaptivity when objects of different stiffness or velocity coexist. show via multiple test scenes that our MPM leads to 6X speed up over traditional synchronous without sacrificing accuracy.