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IEEE International Conference on Plasma Science (ICOPS)

作者： C. Xue C. Mao G. Wang X. Wang D. Xiao Institute of Applied Physics and Computational Mathematics Beijing China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

The electrical explosion process of metal wire in air and water has been calculated with a zero-dimensional dynamical model, and simulated by using two-dimensional MHD program SWEET, then the shock dynamics and energy transport processes are analyzed. The results show that for the total energy of the wire plasma, the Joule heat is a positive source term while the work from the magnetic pressure and pressure of the surrounding media, the heat conduction and radiation flow are loss terms; Changing the diameter and length of the wire can produce different discharge modes and get different deposition rates of electromagnetic energy. Optimizing the diameter of the wire can make the joule heat per unit length reach the maximum; Joule heating provides the energy for the increase of internal energy and temperature of the wire plasma, while the thermal pressure work in the expansion process will reduce internal energy and make the temperature drop; The thermal pressure is the source term of kinetic energy, while the surrounding pressure and magnetic pressure drag the expansion of wire plasma, and their work will reduce the kinetic energy. The kinetic energy of wire plasma in air takes a large proportion of total energy because of the pressure of shocked air is far more lower than the pressure of the wire, while the internal energy of wire plasma in water accounts for a large proportion of total energy for the water pressure is close to the wire pressure after the shock.

关键词： Thermal expansion Electromagnetic heating Electric shock Media Explosions Plasmas Performance analysis

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Investigation of Plasma Mixing Processes in the Context of Indirect Drive Inertial Confinement Fusion

arXiv

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arXiv 2025年

作者： Li, Xiaoran Qiu, Jie Zhang, Shuqing Hao, Liang Zou, Shiyang Institute of Applied Physics and Computational Mathematics Beijing100094 China

In inertial confinement fusion (ICF), the dynamics of plasma mixing in hohlraums critically influence laser-plasma instabilities (LPI) and implosion performance. This study investigates the mixing of hohlraum ablated Au plasmas and filling C5H12 plasmas using one-dimensional particle-in-cell (PIC) simulations. We find that ion-ion collisions slow the diffusion of ions, rendering Au ions sub-diffusive, while C and H ions remain super-diffusive. Due to their lower collisionality, H ions diffuse faster into Au regions than C ions, leading to a distinct separation between C and H ions at the interface. Although an electrostatic shock is still generated at the plasma interface in the presence of collisions, its electric field strength and propagation speed are notably reduced. To systematically explore plasma mixing in hohlraum environments, we evaluate the individual effects of incident laser irradiation, plasma flow, and inhomogeneous density profiles on ion mixing. We find that laser irradiation and plasma flow have a minor impact on ion mixing compared to diffusion-driven processes, while the inhomogeneous density profile restricts diffusion from low-density to high-density regions. By incorporating realistic hohlraum plasma conditions derived from radiation hydrodynamic models into the PIC simulations, we demonstrate that the diffusion of C and H ions continues to dominate ion mixing. Simple phenomenological fits are derived to describe the evolution of the mixing width in a hohlraum condition. Further theoretical calculations indicate that the penetration of H and C into Au plasmas suppresses stimulated Brillouin scattering (SBS) within the mixing layer. This finding underscores the importance of integrating ion mixing effects into LPI codes for more accurate modeling of ICF hohlraum dynamics. Copyright © 2025, The Authors. All rights reserved.

关键词： Stimulated Brillouin scattering

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JUSMAR-MANS: A platform software for compressible multimedium flow large-scale numerical simulation on JASMIN framework 3

JUSMAR-MANS: A platform software for compressible multimediu...

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3rd International Conference on Defence Technology, ICDT 2022

作者： Yu, Y.Q. Liu, N. Zhang, P. Zhang, A.Q. CAEP Software Center for High Performance Numerical Simulation Beijing China Institute of Applied Physics and Computational Mathematics Beijing China

A new platform software named JUSMAR-MANS based on JASMIN was developed for the massively parallel numerical simulation on compressible multimedia multiphase flow under complex conditions. Different from the traditional "chimney"program research and development (r & d) pattern, the MANS who adopted the "platform"r & d pattern provides a way by which the users can rapidly and conveniently customize personalized high-credibility program of multimedium without considering in numerical discrete and parallel computing. MANS has the following advantages: 1) Decoupling of disciplines: In architecture design, physical modeling, numerical discreting, parallel computing are separated from each other and concept shielding so that the high barriers of program r & d caused by interdisciplinary are broken down. 2) Expandability: enables to easily extend new physical models and numerical schemes based on single point/element interfaces. 3) Rapid customization: enable to quickly assemble personalized program based on various models and algorithms libraries integrated by MANS. Based on MANS, it only takes serial code within a few days to obtain a well-posed large - scale multimedium simulation, which greatly reduce the complexity of software r & d for compressible multimedium flow. © Published under licence by IOP Publishing Ltd.

关键词： Numerical models

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Particle-in-cell simulation on the influences of ion-source parameters on flow and expansion characteristics of deuterium-titanium ions

Particle-in-cell simulation on the influences of ion-source ...

引用

IEEE International Conference on Plasma Science (ICOPS)

作者： Y. Dong Q. Zhou W. Yang Q. Sun Z. Dong Institute of Applied Physics and Computational Mathematics Beijing China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

By using a self-programmed cylindrical coordinate 2D3V-PIC (two dimensional, three velocity components, particle-in-cell) code, the influences of ion source parameters on flow and expansion characteristics of deuterium-titanium ions from ion source to expansion cup are numerically investigated in this article. The simulation results demonstrate as follows. The flow and expansion characteristics of deuterium-titanium ions will be influenced by plasma generation rate, electron temperature and kinetic energy of multi-component ion, which hardly influenced by ion proportions. Decreasing electron temperature or plasma generation rate will weaken radial diffusion capabilities of D + and Ti 2+ ions in expansion cup. Increasing kinetic energy of a certain component ion (D + or Ti 2+ ) will also weaken radial diffusion capabilities of this component ion in expansion cup. But, the influence mechanisms are not same. Decreasing electron temperature or plasma generation rate will weaken the electric intensity in plasma-sheath near ion source wall. This effect will weaken the radial accelerating capabilities of ions. Increasing kinetic energy of a certain component ion will cause the total velocity of this component ion deflection from radial to axial direction. Due to the mass of D + notably less than Ti 2+ , the radial diffusion capability of D + is stronger than Ti 2+ . The ion extraction efficiency of D + is notably lower than Ti 2+ . Compared with Ti 2+ , the flow and expansion characteristics of D + is sensitive to ion source parameters. In addition, the ion acceleration mechanisms are theoretically analyzed. The theoretical calculation results well verify the simulated electric-field intensity in plasma-sheath and expansion characteristics of deuterium-titanium ions. There are two ion-acceleration regions. One is sheath region, ions are accelerated by the electric field formed by plasma sheath near ion source wall. The other one is expansion

关键词： Temperature Codes Simulation Ion sources Plasmas Kinetic energy Plasma sheaths

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The Corrected Finite Volume Element Methods for Diffusion Equations Satisfying Discrete Extremum Principle

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Communications in computational physics 2022年第10期32卷 1437-1473页

作者： Ang Li Hongtao Yang Yonghai Li Guangwei Yuan School of Mathematics Jilin UniversityChangchun 130012JilinChina Institute of Applied Physics and Computational Mathematics Fenghaodong RoadHaidian DistrictBeijing 100094China

In this paper,we correct the finite volume element methods for diffusion equations on general triangular and quadrilateral ***,we decompose the numerical fluxes of original schemes into two parts,i.e.,the principal part with a twopoint flux structure and the defective *** then with the help of local extremums,we transform the original numerical fluxes into nonlinear numerical fluxes,which can be expressed as a nonlinear combination of two-point *** is proved that the corrected schemes satisfy the discrete strong extremum principle without restrictions on the diffusion coefficient and *** results indicate that the corrected schemes not only satisfy the discrete strong extremum principle but also preserve the convergence order of the original finite volume element methods.

关键词： Diffusion equations finite volume element flux-correct maximum principle

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Investigation on the scaling of magneto-Rayleigh-Taylor instability for single shell Z-pinches

Investigation on the scaling of magneto-Rayleigh-Taylor inst...

引用

IEEE International Conference on Plasma Science (ICOPS)

作者： X. Wang D. Xiao Institute of Applied Physics and Computational Mathematics Beijing China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

One of the applications of the Z-pinch technique is dynamic hohlraum driven inertial confinement fusion (ICF). This dynamic hohlraum is created by accelerating high-Z plasma to impact low-Z material through the magnetic field generated by pulse current. The interface between the high-Z plasma and the magnetic field is susceptible to Magneto-Rayleigh-Taylor (MRT) instability, which can lower the performance of the dynamic hohlraum. Understanding the relationship between the MRT instability and the rise time of the pulse current is crucial for achieving ignition in Z-pinch ICF. Initially, the scaling of MRT instability with the current rise time was investigated using theoretical and numerical methods. The study revealed that the perturbation amplitude of the instability increases linearly with the current rise time for the same implosion velocity when the Z-pinch constant coefficient is kept. To validate this finding, three types of wire-array experiments were conducted with similar implosion dynamics and nearly identical implosion velocities on an 8 MA pulse power generator. It is for the first time to achieve similar wire-array Z-pinch implosions while scaling up the current rise time to three times on the generator. The experimental outcomes, which included the shape of x-ray radiation and x-ray images of imploding plasmas, along with corresponding numerical analysis, confirmed that the MRT instability before stagnation indeed increases linearly with the rise time, consistent with the predictions of the theoretical model.

关键词： Shape Magnetic resonance imaging Magnetic confinement Perturbation methods Predictive models Generators Plasmas

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Streamline Tracing Visualization Of Flow On Surfaces 17

Streamline Tracing Visualization Of Flow On Surfaces

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17th International Conference on Interfaces and Human Computer Interaction 2023, IHCI 2023, the 17th International Conference on Computer Graphics, Visualization, Computer Vision and Image Processing 2023, CGVCVIP 2023 and 16th International Conference on Game and Entertainment Technologies 2023, GET 2023

作者： Wu, Fukun Cao, Yi Dong, Qingli CAEP Software Center for High Performance Numerical Simulation Beijing China Institute of Applied Physics and Computational Mathematics Beijing China

ISBN: (纸本)9789898704498

To address the visualization problem of surface streamline on complex curved surfaces, we present and implement an efficient surface streamline generation method for visualizing vector field on arbitrary geometry. The intersection calculation on curved surfaces with complex topology is performed to achieve the high-precision underlying vector. Then, this approach adopts an extended Runge-Kutta streamline integration technology for performing streamline tracing on an unstructured mesh, where the adaptive stepsize strategy and intersection acceleration structure are presented for sake of simplicity and efficiency. Finally, this approach is integrated into a visualization software to enhance the visualizing capability. The experimental results demonstrate that our approach can efficiently and accurately generate continuous and consistent geometric surface streamlines on curved surfaces. © 2023 Proceedings of the International Conferences on Interfaces and Human Computer Interaction 2023, IHCI 2023;Computer Graphics, Visualization, Computer Vision and Image Processing 2023, CGVCVIP 2023;and Game and Entertainment Technologies 2023, GET 2023. All rights reserved.

关键词： Computer games

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Massively parallel numerical simulation of 3D shock wave propagation based on JASMIN framework 3

Massively parallel numerical simulation of 3D shock wave pro...

引用

3rd International Conference on Defence Technology, ICDT 2022

作者： Liu, N. Zhang, P. Li, K. Yu, Y.Q. CAEP Software Center for High Performance Numerical Simulation Beijing China Institute of Applied Physics and Computational Mathematics Beijing China

An efficient massively parallel computing program for shock wave propagation named Shock3d is developed for shock wave damage mechanism in complex scenes. With the finite volume method, the program is built upon JASMIN (J parallel Adaptive Structured Mesh applications INfrastructure) and employs a component-based hierarchical organization structure. Using the patch-based core algorithm, Shock3d enables high parallel efficiency and strong parallel scalability with a parallel domain decomposition method and an image domain-based communication mode. It not only considers gravity, real gas effects, and boundaries in complex scenes, but also supports dynamic load balancing (DLB) and three-dimensional structured meshes and allows the parallel solution of hundreds of millions of mesh problems. Typical examples were used to verify the validity, parallelism, and high-resolution simulation results of the program developed. In the scalability test, where the propagation of shock waves through hundreds of millions of mesh elements was simulated on 300,000 CPU cores, the program delivered parallel efficiency of 60.84%. © Published under licence by IOP Publishing Ltd.

关键词： Shock waves

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norm convergence of IMEX BDF2 scheme with variable-step for the incompressible Navier-Stokes equations

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Numerical Algorithms 2024年第4期98卷 1917-1942页

作者： Ji, Bingquan Zhao, Xuan Institute of Applied Physics and Computational Mathematics Beijing China School of Mathematics Southeast University Nanjing China

We present an $$L^2$$ norm convergence of the implicit-explicit BDF2 scheme with variable-step for the unsteady incompressible Navier-Stokes equations with an inf-sup stable FEM for the space discretization. Under a w...

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Htem: High-Throughput Toolkit for Elasticity Modeling

SSRN

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SSRN 2025年

作者： Yang, Zhen Xian, Jiawei Xu, Yuanji Lin, De-Ye Wang, Qingchun Gao, Xingyu Tian, Fuyang Song, Haifeng Institute for Applied Physics University of Science and Technology Beijing Beijing100083 China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing100094 China CAEP Software Center for High Performance Numerical Simulation Institute of Applied Physics and Computational Mathematics Beijing100094 China

The elasticity under varying temperatures and pressures is particularly significant for understanding mechanical properties and structural phase transitions. Consequently, there is an increasing demand for tools capable of determining elasticity across wide temperature and pressure ranges, either numerically or analytically. We propose HTEM, a comprehensive toolkit that automates the workflow for input generation, elastic calculations, modeling, and visualization within an integrated framework. HTEM performs simulations with four computational modes, allowing users to balance accuracy and efficiency. It incorporates a semi-analytic model for robust, high-precision elastic modeling with finite data combinations, even using sparse elasticity at high temperatures. To validate the workflows of calculation and modeling, we perform HTEM to study the elasticity of Si across wide temperature and pressure ranges. Results show the high precision and high efficiency of HTEM. And modeling mitigates noise from constant pressure ensemble simulations. Furthermore, HTEM provides detailed visualizations of elasticity and its anisotropy as functions of temperature and pressure, providing comprehensive insights into how the intrinsic properties of materials evolve under varying conditions. © 2025, The Authors. All rights reserved.

关键词： Elasticity

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