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Optimizations and applications in large-scale scenes of Monte Carlo geometry conversion code CMGC

Nuclear Science and Techniques 2025年第4期36卷 220-232页

作者： Xin Wang Ling-Yu Zhang Xue-Ming Shi Zhen Wu Jun-Li Li Gui-Ming Qin Yuan-Guang Fu CAEP Software Center for High Performance Numerical Simulation Beijing 100088China Institute of Applied Physics and Computational Mathematics Beijing 100088China Department of Engineering Physics Tsinghua UniversityBeijing 100084China

In response to the demand for rapid geometric modeling in Monte Carlo radiation transportation calculations for large-scale and complex geometric scenes,functional improvements,and algorithm optimizations were performed using CAD-to-Monte Carlo geometry conversion(CMGC)*** representation(BRep)to constructive solid geometry(CSG)conversion and visual CSG modeling were combined to address the problem of non-convertible geometries such as spline *** splitting surface assessment method in BRep-to-CSG conversion was optimized to reduce the number of Boolean operations using an Open ***,in turn,reduced the probability of CMGC conversion *** auxiliary surface generation algorithm was optimized to prevent the generation of redundant auxiliary surfaces that cause an excessive decomposition of CAD geometry *** optimizations enhanced the usability and stability of the CMGC model *** was applied successfully to the JMCT transportation calculations for the conceptual designs of five China Fusion engineering Test Reactor(CFETR)*** rapid replacement of different blanket schemes was achieved based on the baseline CFETR *** geometric solid number of blankets ranged from hundreds to tens of *** correctness of the converted CFETR models using CMGC was verified through comparisons with the MCNP calculation *** CMGC supported radiation field evaluations for a large urban scene and detailed ship *** enabled the rapid conversion of CAD models with thousands of geometric solids into Monte Carlo CSG *** analysis of the JMCT transportation simulation results further demonstrated the accuracy and effectiveness of the CMGC.

关键词： Monte Carlo CAD BRep to CSG CMGC

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Multi-perception large kernel convnet for efficient image super-resolution

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四川大学学报(自然科学版) 2025年第1期62卷 67-78页

作者： MIAO Xuan LI Zheng XU Wen-Zheng College of Computer Science(College of Software) Sichuan UniversityChengdu 610065China Tianfu Engineering-Oriented Numerical Simulation&Software Innovation Center Sichuan UniversityChengdu 610207China

Significant advancements have been achieved in the field of Single Image Super-Resolution(SISR)through the utilization of Convolutional Neural Networks(CNNs)to attain state-of-the-art *** efforts have explored the incorporation of Transformers to augment network performance in ***,the high computational cost of Transformers makes them less suitable for deployment on lightweight ***,the majority of enhancements for CNNs rely predominantly on small spatial convolutions,thereby neglecting the potential advantages of large kernel *** this paper,the authors propose a Multi-Perception Large Kernel convNet(MPLKN)which delves into the exploration of large kernel ***,the authors have architected a Multi-Perception Large Kernel(MPLK)module aimed at extracting multi-scale features and employ a stepwise feature fusion strategy to seamlessly integrate these *** addition,to enhance the network's capacity for nonlinear spatial information processing,the authors have designed a Spatial-Channel Gated Feed-forward Network(SCGFN)that is capable of adapting to feature interactions across both spatial and channel *** results demonstrate that MPLKN outperforms other lightweight image super-resolution models while maintaining a minimal number of parameters and FLOPs.

关键词： Single Image Super-Resolution Lightweight model Deep learning Large kernel

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Prediction of New Functional Fluorooxoborates with Expected Anionic Framework:A Case of CaB_(3)O_(5)F

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Chinese Physics Letters 2025年第3期42卷 85-92页

作者： Ke-Wang Zhang Wen-Qi Jin Ke Li Abudukadi Tudi Lin-Lin Liu Cong-Wei Xie Yu Xie Research Center for Crystal Materials CAS Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Functional Crystal MaterialsXinjiang Technical Institute of Physics&ChemistryCASUrumqi 830011China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Materials Simulation Methods&Software of Ministry of Education International Center of Future ScienceKey Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education)College of PhysicsJilin UniversityChangchun 130012China

The prediction of new fluorooxoborates as ultraviolet(UV)/deep ultraviolet(DUV)opto-electronic functional materials from a largely unexplored chemical space is a challenging *** has been suggested that the anionic frameworks formed by B–O and B–O–F units significantly determine the physical properties of ***,the rational design of anionic frameworks could facilitate the materials discovery ***,we propose that a candidate anionic framework can be efficiently derived from an existing one by slightly altering its oxygen *** this idea,we hypothesized the existence of a 1D[B_(3)O_(5)F]_(∞)chain from the wellknown 2D[B_(6)O_(9)F_(2_)]_(∞)***,seven CaB_(3)O_(5)F structures with the expected anionic framework were successfully ***-principles calculations show that all these structures have potential in the UV/DUV birefringent or nonlinear optical(NLO)material field,indicating that the 1D[B_(3)O_(5)F]_(∞)chain is indeed a promising anionic framework for achieving UV/DUV birefringent and NLO performance.

关键词： process borate anionic

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Dynamic Interactions of Large-Scale Tandem Bubbles with a Rigid Wall

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International Journal of Mechanical sciences 2025年 297-298卷

作者： Liu, Rui Zhao, Zitong Rong, Jili School of Aerospace Engineering Beijing Institute of Technology Beijing 100081 China CAEP Software Center for High Performance Numerical Simulation Beijing 100088 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China

In natural phenomena and industrial applications, bubble evolution is often governed by complex inter-bubble interactions and boundary effects. However, the evolution of tandem bubbles near boundaries has not been thoroughly investigated in existing studies. The interface-sharpening six-equation multiphase model is capable of accurately capturing rapid topology evolution at gas–liquid interfaces, enabling the prediction of complex phenomena such as bubble coalescence and collapse. In this study, the accuracy of the numerical model is validated through free-field experiment and the unified bubble theory. The numerical model simulates the evolution of single bubbles, tandem bubbles, and out-of-phase tandem bubbles near a rigid wall. The effects of inter-bubble distance (γbb ∈ [0.5, 1.6]) and out-of-phase parameter (τ ∈ [0, 1]) on bubble dynamics and wall impact are investigated, with particular attention to their influence on bubble penetration. The impact load on the wall is primarily composed of bubble collapse pressure, water-jet impact pressure, and bubble pulsation pressure. As γbb increases, the collapse mechanism of upper bubble transitions from water-jet induced mechanism to a local high-pressure induced mechanism, reaching the highest impact intensity at γbb = 1.2. As τ increases, the collapse mechanism of upper bubble gradually shifts from low-pressure bubble suppression mechanism to a local high-pressure induced mechanism. When γbb ≤ 0.9, the impact enhancement effect on the wall can be induced by adjusting the parameter τ, with the optimal impact enhancement occurring at τ = 0.833. These transitions in collapse mechanisms are further explained by the Kelvin impulse theory. The analytical conclusions provide valuable insights into the complex evolution of tandem bubbles near boundaries. © 2025 Elsevier Ltd

关键词： Multiphase flow

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Fatigue reliability analysis of offshore wind turbines under combined wind-wave excitation via DPIM

arXiv

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arXiv 2025年

作者： Ding, Jingyi Chen, Hanshu Liu, Xiaoting Rashed, Youssef F. Fu, Zhuojia Center for Numerical Simulation Software in Engineering and Sciences College of Mechanics and Engineering Science Hohai University Jiangsu Nanjing211100 China Institute of Science and Technology Research China Three Gorges Corporation Beijing210098 China Department of Structural Engineering Cairo University Giza Egypt

As offshore wind turbines develop into deepwater operations, accurately quantifying the impact of stochastic excitations in complex sea environments on offshore wind turbines and conducting structural fatigue reliability analysis has become challenging. In this paper, based on long-term wind-wave reanalysis data from a site in the South China Sea, a novel direct probability integral method (DPIM) is developed for the stochastic response and fatigue reliability analyses of the key components for the floating offshore wind turbine structures under combined wind-wave excitation. A 5MW floating offshore wind turbine is considered as the research object, and a fully coupled dynamic response analysis of the wind turbine system is conducted to calculate the short-term fatigue damage value of tower base and blade root. The DPIM is applied to calculate the fatigue reliability of the wind turbine structure. The accuracy and efficiency of the proposed method are validated by comparing the obtained results with those of Monte Carlo simulations. Furthermore, the results indicate that the fatigue life of floating offshore wind turbine structures under combined wind-wave excitation meets the design requirements. Notably, the fatigue reliability of the wind turbine under aligned wind-wave condition is lower compared to misaligned wind-wave condition. Copyright © 2025, The Authors. All rights reserved.

关键词： Offshore wind turbines

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Stochastic dynamic analysis of multi-layer functionally graded material cylinders using direct probability integral method with improved smoothing technique

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Probabilistic engineering Mechanics 2025年 80卷

作者： Lu, Wen Wu, Zhigen Yang, Dixiong Meng, Zeng Chen, Hanshu School of Civil Engineering Hefei University of Technology Hefei230009 China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering Mechanics Dalian University of Technology Dalian116024 China Jianghuai Advance Technology Center Hefei230000 China Center for Numerical Simulation Software in Engineering and Sciences College of Mechanics and Engineering Science Hohai University Nanjing211100 China

Uncertainties are inherently inevitable in the application of functionally graded materials (FGMs) structures. Existing analysis methods face challenges in terms of accuracy and efficiency when addressing these uncertainties, especially for dynamic problems. To this end, this paper proposes a direct probability integral method with improved smoothing technique (DPIM-IST) for the stochastic dynamic analysis of FGM cylinders. Subsequently, an adaptive framework is constructed based on the maximum entropy principle to determine the variable smoothing parameters at each representative point. To search for the proper smoothing parameter vector, a hybrid grey wolf optimizer is employed, which combines the grey wolf optimizer and BFGS method. Moreover, the dynamic responses at each representative point are evaluated by utilizing the differential quadrature method and Newmark algorithm. Several numerical and multiphase and multi-layer FGM hollow cylinder examples, involving nonlinear performance functions with Gaussian and non-Gaussian parameters, are investigated to validate the accuracy of the proposed DPIM-IST. © 2025 Elsevier Ltd

关键词： Integral equations

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Effect of leading-edge and trailing-edge camber morphing on gust load for an elastic wing

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Chinese Journal of Aeronautics 2025年第4期 208-224页

作者： Yuting DAI Yating HU You WU Chen SONG Chao YANG School of Aeronautic Science and Engineering Beihang University Tianmushan Laboratory CAEP Software Center for High-Performance Numerical Simulation Institute of Applied Physics and Computational Mathematics

This paper investigates the influence of the spanwise-distributed trailing-edge camber morphing on the dynamic stall characteristics of a finite-span wing at Re=2×10～*** mathematical model of the spanwise-distributed trailing-edge camber morphing is established based on Chebyshev polynomials,and the deformed wing surface is modeled by a spline surface according to the rib's morphing in the chordwise *** Computational Fluid Dynamics(CFD)method is adopted to obtain flow-field results and aerodynamic *** SST-γ model is introduced and the overset mesh technique is *** numerical results show that the spanwisedistributed trailing-edge morphing obviously changes the aerodynamic and energy transfer characteristics of the dynamic *** when the phase difference between the trailing-edge motion and the wing pitch is-π/2,the interaction between the three-dimensional(3-D) Leading-Edge Vortex(LEV) and Trailing-Edge Vortex(TEV) is strengthened,and the work done by the aerodynamic force turns *** indicates that the trailing-edge deformation has the potential to suppress the oscillation amplitude of stall *** also found that as the trailing-edge camber morphing varies more complexly along the spanwise direction,the suppression effect decreases accordingly.

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FREE VIBRATION ANALYSIS OF ARBITRARY SHAPED PLATES BY BOUNDARY KNOT METHOD

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Acta Mechanica Solida Sinica 2009年第4期22卷 328-336页

作者： Jisong Shi Wen Chen Chanyuan Wang Center for Numerical Simulation Software in Engineering and Sciences Department of Engineering Mechanics Hohai University Nanjing 210098 China

The boundary knot method （BKM） is a truly meshless boundary-type radial basis function （RBF） collocation scheme, where the general solution is employed instead of the fundamental solution to avoid the fictitious outside boundary of the physical domain of interest. In this study, the BKM is first used to calculate the free vibration of free and simply-upported thin plates. Compared with the analytical solution and ANSYS （a commercial FEM code） results, the present BKM is highly accurate and fast convergent.

关键词： boundary knot method radial basis function meshless eigenvalues vibration

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A novel numerical method for infinite domain potential problems

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Chinese Science Bulletin 2010年第16期55卷 1598-1603页

作者： CHEN Wen FU ZhuoJia Center for Numerical Simulation Software in Engineering and Sciences Department of Engineering Mechanics College of Civil EngineeringHohai University Nanjing 210098 China

The infinite domain potential problems arise in many branches of scientific and engineering fields, which by now still pose a great challenge to scientific computing *** study proposes a novel meshless singular boundary method (SBM) to solve infinite domain potential *** SBM is mathematically simple, easy-to-program, meshless and *** guar-antee the uniqueness of numerical solutions, this article adds a constant term into the SBM approximate *** effi-ciency and accuracy of the proposed technique are tested to the three infinite domain potential problems.

关键词：数值方法无限域边界无单元法管理无界域一体化无网格数值解

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Regulation of Shock Response in Cage-Like High-Energy-Density Materials: Competition between Strain Energy and Structural Symmetry

SSRN

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SSRN 2025年

作者： Song, Qingguan Meng, Li Jiang, Shengli Zhang, Lei Mo, Zeyao Institute of Applied Physics and Computational Mathematics Beijing100088 China CAEP Software Center for High Performance Numerical Simulation Beijing100088 China Institute of Chemical Materials China Academy of Engineering Physics Mianyang621999 China School of Materials Science & Engineering Beijing Institute of Technology Beijing100081 China State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of Technology Beijing100081 China

The cage-like structures provide a unique combination of strain energy for enhanced energy storage and hyperstatic constraints to stabilize the system, positioning them as promising pioneers in advancing high-energy-density materials (HEDMs). However, the shock response of cage-like HEDMs is highly complex and exhibits significant variability, posing a grand challenge in the underlying mechanisms. This study reveals that the shock response of cage-like HEDMs is regulated by the interplay between strain energy and structural symmetry, and introduces a physical model to quantitatively describe how they determine shock stability. The investigated systems include a comprehensive series of cage-like polynitrocubane HEDMs, with each carbon atom in the backbone progressively functionalized with nitro groups. Ab initio molecular dynamics (AIMD) simulations were employed to simulate dynamic and kinetic responses at shock velocities ranging from 8 km/s to 11 km/s, with validation provided by consistent Hugoniot curves that align with reported experimental data. Nitro substituents at the carbon-based cage structure, recognized as explosion functional groups, were found to substantially increase the system's strain energy. However, an increasing number of nitro substituents also intensified electrostatic repulsion among oxygen lone pairs, which weakens structural integrity and renders the material more susceptible to disassembly under shock conditions. Conversely, structural symmetry—including both the cage-like molecular conformation and spatial packing within the crystal lattice—was found to mitigate these destabilizing effects, effectively balancing the trade-off between energy storage and structural stability. Based on these findings, we propose a physical model that captures the essential factors driving shock initiation in cage-like HEDMs, offering new insights to inform the design and application of novel advanced HEDMs. © 2025, The Authors. All rights reserved.

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