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Automated regression test method for scientific computing libraries:Illustration with SPHinXsys

Journal of Hydrodynamics 2024年第3期36卷 466-478页

作者： Bo Zhang Chi Zhang xiangyu hu TUM School of Engineering and Design Technical University of MunichMunichGermany

Scientific computing libraries,whether in-house or open-source,have witnessed enormous progress in both engineering and scientific ***,it is important to ensure that modifications to the source code,prompted by bug fixing or new feature development,do not compromise the accuracy and functionality that have been already validated and *** paper introduces a method for establishing and implementing an automatic regression test environment,using the open-source multi-physics library SPHinXsys as an illustrative ***,a reference database for each benchmark test is generated from observed data across multiple *** comprehensive database encapsulates the maximum variation range of metrics for different strategies,including the time-averaged,ensemble-averaged,and dynamic time warping *** accounts for uncertainties arising from parallel computing,particle relaxation,physical instabilities,and ***,new results obtained after source code modifications undergo testing based on a curve-similarity comparison against the reference *** the source code is updated,the regression test is automatically executed for all test cases,providing a comprehensive assessment of the validity of the current *** regression test environment has been successfully implemented in all dynamic test cases within SPHinXsys,including fluid dynamics,solid mechanics,fluid-structure interaction,thermal and mass diffusion,reaction-diffusion,and their multi-physics couplings,and demonstrates robust capabilities in testing different *** is noted that while the current test environment is built and implemented for a particular scientific computing library,its underlying principles are generic and can be easily adapted for use with other libraries,achieving equal effectiveness.

关键词： Scientific computing open-source library verification and validation regression test automatic test environment curve similarity comparison smoothed particle hydrodynamics

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基于逻辑回归算法的大学生乡村创业研究

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科技创新与生产力 2024年第8期45卷 75-78页

作者：胡湘雨湖南环境生物职业技术学院湖南衡阳421005

本文针对新时代背景下大学生乡村创业意愿展开了问卷调查,并采用Logistic二元回归模型进行了回归分析,以探讨个人特质、家庭特征、创业环境感知(社会资源)、创业动机4个因素对大学生乡村创业意愿的影响。研究结果表明,性别、年级、创业... 详细信息

本文针对新时代背景下大学生乡村创业意愿展开了问卷调查,并采用Logistic二元回归模型进行了回归分析,以探讨个人特质、家庭特征、创业环境感知(社会资源)、创业动机4个因素对大学生乡村创业意愿的影响。研究结果表明,性别、年级、创业能力、父母支持、亲朋好友支持、政策、创业教育等因素对大学生乡村创业意愿具有显著影响。

关键词：大学生乡村创业创业意愿 Logistic二元回归模型

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SPH modeling of fluid-structure interaction

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Journal of Hydrodynamics 2018年第1期30卷 62-69页

作者： Luhui Han xiangyu hu Department of Mechanical Engineering Technical University of Munich

This work concerns numerical modeling of fluid-structure interaction（FSI） problems in a uniform smoothed particle hydrodynamics（SPH） framework. It combines a transport-velocity SPH scheme, advancing fluid motions, with a total Lagrangian SPH formulation dealing with the structure deformations. Since both fluid and solid governing equations are solved in SPH framework, while coupling becomes straightforward, the momentum conservation of the FSI system is satisfied strictly. A well-known FSI benchmark test case has been performed to validate the modeling and to demonstrate its potential.

关键词： Fluid-structure interaction(FSI) smoothed particle hydrodynamics(SPH) total Lagrangian formulation

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An efficient multi-resolution SPH framework for multi-phase fluid-structure interactions

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Science China(Physics,Mechanics & Astronomy) 2023年第10期66卷 92-113页

作者： Chi Zhang Yujie Zhu xiangyu hu TUM School of Engineering and Design Technical University of MunichGarching 85748Germany huawei Technologies Munich Research Center Munich 80992Germany Xi'an Research Institute of Hi-Tech Xi'an 710025China

Applying different spatial and temporal resolutions for different sub-systems is an effective approach to increase computational efficiency for particle-based methods. However, it still has many challenges in terms of achieving an optimized computational efficiency and maintaining good numerical robustness and accuracy for the simulation of multi-phase flows involving large density ratio and interacting with rigid or flexible structures. In the present work, based on the multi-resolution smoothed particle hydrodynamics(SPH) method [Zhang et al., JCP 429, 110028(2021)], an efficient multi-resolution SPH framework for multi-phase fluid-structure interactions(FSI) is proposed. First, an efficient multi-phase model, exploiting different density reinitialization strategies instead of applying different formulations to implement mass conservation to the light and heavy phases, respectively,is developed and the same artificial speed of sound for both phases can be used. Then, the transport velocity formulation is rewritten by applying temporal local flow state dependent background pressure to eliminate the unnatural voids, unrealistic phase separation and decrease the numerical dissipation. Finally, the one-sided Riemann-based solid boundary condition is modified to handle the FSI coupling in both single-and multi-resolution scenarios in the triple point. A set of examples involving multi-phase flows with high density ratio, complex interface and multi-phase FSI are studied to demonstrate the efficiency, accuracy and robustness of the present method.

关键词： multi-resolution method smoothed particle hydrodynamics multi-phase flows multi-phase FSI

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A CAD-compatible body-fitted particle generator for arbitrarily complex geo-metry and its application to wave-structure interaction

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Journal of Hydrodynamics 2021年第2期33卷 195-206页

作者： Yujie Zhu Chi Zhang Yongchuan Yu xiangyu hu Department of Mechanical Engineering Technical University of MunichGarchingGermany Department of Aerospace and Geodesy Technical University of MunichTaufkirchenGermany

Generating body-fitted particle distribution for arbitrarily complex geometry underpins the applications of particle-based method to engineering and bioengineering and is highly challenging,and thus hinders the potential of particle *** this paper,we present a new computer-aided design(CAD)compatible body-fitted particle generator,termed as CAD-BPG,for arbitrarily complex 3-D *** parsing a CAD model,the present method can accurately tackle arbitrarily complex geometry representation and describe the corresponding geometry surface by constructing an implicit zero level-set function on Cartesian background *** achieve a body-fitted and isotropic particle distribution,physics-driven relaxation process with surface bounding governed by the transport-velocity formulation of smoothed particle hydrodynamics(SPH)methodology is conducted to characterize the particle evolution.A set of examples,ranging from propeller,stent structures and anatomical heart models,show simplicity,accuracy and versatility of the present CAD-BPG for generating body-fitted particle distribution of arbitrarily complex 3-D *** but not least,the present CAD-BPG is applied for modeling wave-structure interaction,where wave interaction with an oscillating wave surge converter is studied,and the results show that the present method not only provides an efficient and easy-to-implement pre-processing tool for particle-based simulation but also improves the numerical accuracy compared with lattice particle ***,the propose CAD-BPG sheds light on simulating real-world applications by particle-based methods for researchers and engineers.

关键词： CAD-compatible body-fitted particle distribution level-set

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A Differentially Private Auction Mechanism in Online Social Networks

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Journal of Systems Science and Systems Engineering 2021年第4期30卷 386-399页

作者： xiangyu hu Dayong Ye Tianqing Zhu huan huo University of Technology SydneyAustralia

The growing popularity of users in online social network gives a big opportunity for online *** famous Information Diffusion Mechanism(IDM)is an excellent method even meet the incentive compatibility and individual *** the existing auction in online social network has considered the buyers’information which is not known by the seller,current mechanism still can not preserve the privacy information of users in online social *** this paper,we propose a novel mechanism based on the IDM and differential *** mechanism can successfully process the auction and at the same time preserve clients’price information from *** achieved these by adding virtual nodes to each node and Laplace noise for its price in the auction *** also formulate this mechanism on the real network and the random network,scale-free network to show the feasibility and effectiveness of the proposed *** evaluation shows that the result of our methods only depend on the noise added to the *** is independent from the agents’original price.

关键词： Online social network auction privacy preserving differential privacy

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预测全球电离层的多通道ConvLSTM模型

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导航定位学报 2024年第5期12卷 125-131页

作者：陈鑫鑫李淑慧陈栋胡翔宇中国地质大学(北京)土地科学技术学院北京100083

为了进一步提升导航高精度实时定位的精度,提出一种预测全球电离层的多通道ConvLSTM模型:根据全球电离层地图(GIM)时空变化非线性的特征以及电离层总电子含量(TEC)与太阳活动和地磁活动的相关性,提出以行星际三小时磁情指数(Kp)、太阳... 详细信息

为了进一步提升导航高精度实时定位的精度,提出一种预测全球电离层的多通道ConvLSTM模型:根据全球电离层地图(GIM)时空变化非线性的特征以及电离层总电子含量(TEC)与太阳活动和地磁活动的相关性,提出以行星际三小时磁情指数(Kp)、太阳黑子数(SSN)以及TEC作为多通道输入的基于编码器-解码器的卷积-长短期记忆神经网络(ConvLSTM)模型;然后将2018-2020年的电离层TEC及相关数据作为数据集,提前1 d预测GIM。结果表明,基于多通道输入的模型在预测任务上具有显著优势,且不同输入的ConvLSTM模型皆优于欧洲定轨中心1 d预报GIM(C1PG)模型;在地磁平静期和磁暴期,多通道输入的模型表现良好。

关键词：电离层总电子含量多通道卷积网络长短期记忆神经网络预测

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Judicial Changes in Qing Beijing during the Shunzhi Period(1644-61)

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Frontiers of History in China 2020年第4期15卷 579-610页

作者： hu xiangyu Institute of Qing History Renmin University of ChinaBeijing 100872China

The judicial system in Qing Beijing integrated both Ming and Manchu *** the Ming judicial system,the first level of courts in Beijing included the Ministry of Justice and the Censorate,and on the second level was the Court of Judicial *** the Ming,however,this system became heavily disrupted by the intelligence security apparatuses,like the Eastern *** the Manchu system,on the first level of courts was the banner company captains and on the second level was the Ministry of *** 1644,the Ming^institutional legacies and lessons remained so important to Manchu rulers that they eventually created an integrated legal system that primarily drew from the Ming *** integration reflected the Qing dynasty’s endeavor to adopt Ming *** Regent Dorgon insisted upon judicial separation on the first level of the courts—Censors of the Five Wards could not settle cases involving banner people,nor could the banner system handle cases involving civilians—while the Shunzhi emperor and his successors wanted judicial unity in Beijing and ordinary banner people and civilians to be adjudicated by the same courts.

关键词： Beijing Qing judicial system Manchus Shunzhi Dorgon

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An Eulerian SPH method with WENO reconstruction for compressible and incompressible flows

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Journal of Hydrodynamics 2023年第2期35卷 210-221页

作者： Zhentong Wang Chi Zhang Oskar J.Haidn xiangyu hu TUM School of Engineering and Design Technical University of MunichMunichGermany huawei Technologies Munich Research Center MunichGermany

While Eulerian smoothed particle hydrodynamics(SPH)method has received increasing attention in scientific and industrial communities owing to its high spatial accuracy,it exhibits excessive numerical dissipation due to the fact that the flux is derived in particle pair *** this paper,we adopt a one-dimensional weighted essentially non-oscillatory(WENO)reconstruction to reduce the numerical dissipation and improve the overall accuracy particularly in capturing the contact *** underlying principle is to construct a 4-point stencil along the interacting line of each particle pair and then the WENO scheme is applied to reconstruct the initial states of the Riemann problem which determines the flow flux.A set of benchmark tests for both compressible and incompressible flows are studied to investigate the accuracy,robustness and versatility of the proposed Eulerian SPH method with the WENO reconstruction(ESPH-WENO).

关键词： Eulerian smoothed particle hydrodynamics(SPH) compressible flows incompressible flows Riemann problem

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The Power of M ercy:Amnesty Policies in Fugitive Cases in the Qing Dynasty

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Frontiers of Law in China-Selected Publications from Chinese Universities 2020年第1期15卷 4-19页

作者： hu xiangyu Institute of Qing History Renmin University of ChinaBeijing 100872China

A new statute.“Hiding New and Old Fugitive Slaves of Manchus,”was added to the First version of the Qing code in *** this statute surprisingly regulated that any offenders would be excluded from any *** is especially noteworthy because,according to both Ming and Qing codes,only severe crimes,such as treason and rebellion,were excluded from any *** scholars have not considered why the statute excluded any amnesties,nor have they analyzed how this amnesty policy was implemented in *** article contends that the exclusion did not arise from Manchu ***,it was an exceptional response to the norms of amnesties in the Ming and Qing *** the fugitive problem,involving slaves of Manchus fleeing from the banner system,endangered Manchus interests,the Qing court was compelled to exclude fugitive criminals from ***,the Qing court did not strictly apply the amnesty policy of this *** in fugitive cases were sometimes pardoned because of amnesties during the Dorgon regency ***,Shun/.***,and Kangxi all initially excluded those harboring fugitives from amnesties,but later changed their amnesty policies in this *** though the crime of harboring fugitives became a permanent symbol of Manchu rule and was recorded in every emperor's enthronement edict from Kangxi to *** Qing court gradually came to accept norms concerning amnesties as practiced in Han society and treated fugitive cases as ordinary court cases during and after the Kangxi emperor's reign.

关键词： amnesty policies fugitive slaves fugitive law Manchu Qing dynasty

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