Acta Mechanica Sinica最新文献

{"title":"A unified framework based on implicit finite volume method for fluid-thermal coupling simulations on unstructured mesh","authors":"Jia Yan \u0000 (,&nbsp;),&nbsp;Jianan Hu \u0000 (,&nbsp;),&nbsp;Liyue Wang \u0000 (,&nbsp;),&nbsp;Jue Ding \u0000 (,&nbsp;),&nbsp;Xiaoquan Yang \u0000 (,&nbsp;)","doi":"10.1007/s10409-026-51193-x","DOIUrl":"10.1007/s10409-026-51193-x","url":null,"abstract":"<div><p>A computational framework based on the implicit finite volume method for simulating fluid-thermal coupling problems is presented in this paper. The framework solves the Navier-Stokes equations in the fluid domain and the heat conduction equation in the solid domain, with coupled information exchange across coupled interfaces. The governing equations are discretized using the finite volume method, maintaining consistency between the fluid and solid formulations. A methodology that has been proven to exhibit excellent robustness and computational efficiency in flow field simulations has been applied to heat conduction calculations, incorporating the direct discontinuous Galerkin method, generalized minimal residual linear solver, exact Jacobian computation, and adaptive time step. Furthermore, a novel interpolation method for non-matching interfaces in fluid-thermal coupling is developed. By utilizing a polygon clipping algorithm combined with an area-weighted interpolation scheme, accurate data transfer at the coupling boundary is achieved. Numerical results demonstrate that this methodology significantly enhances the stability and efficiency of both fluid field simulation and heat conduction simulation, while maintaining high accuracy in predicting heat transfer characteristics.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Linear stability analysis of a collapsible channel flow","authors":"Danyang Wang \u0000 (,&nbsp;),&nbsp;Hao Gao,&nbsp;Zishun Liu \u0000 (,&nbsp;)","doi":"10.1007/s10409-026-51244-x","DOIUrl":"10.1007/s10409-026-51244-x","url":null,"abstract":"<div><p>Linear stability analysis, which evaluates a system’s behaviour near its steady state, is widely used to investigate stability in various dynamic systems. However, when applied to fluid-structure interaction systems with flexible interfaces, special consideration is required due to the complexity introduced by moving boundaries. In order to establish a theoretically rigorous and mathematically precise framework for linearising fluid-structure interaction systems characterised by flexible interfaces, this study develops a methodology that incorporates the contributions of flexible interfaces into the linearisation by applying a Taylor expansion about the system’s steady state. In addition, a widely adopted linearisation approach that approximates variables directly on the steady-state interface is also considered. We present a systematic comparison of these two linearisation methods in terms of their theoretical development and numerical results. In particular, we use a collapsible channel flow model as an illustrative example to examine these linearisation approaches for both flux-driven and pressure-driven systems. Our results show that both the Taylor-based mapping and direct mapping linearisation methods accurately predict the critical parameters characterising the system’s neutral stability. Moreover, the more rigorous Taylor-based linearisation captures perturbation flow field details that the simplified direct mapping approach fails to resolve. This improved resolution provides a more robust foundation for further investigation of perturbation mechanisms, such as perturbation energy analyses that require precise numerical evaluation of perturbation velocity and pressure.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 11","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Crossflow effect on flow control of swept-back multi-element wing by synthetic jets","authors":"Jiaxing Li \u0000 (,&nbsp;),&nbsp;Lihao Feng \u0000 (,&nbsp;),&nbsp;Yanan Gong \u0000 (,&nbsp;)","doi":"10.1007/s10409-026-51167-x","DOIUrl":"10.1007/s10409-026-51167-x","url":null,"abstract":"<div><p>In response to the future demand for efficient and simplified high-lift configuration in civil aircraft, this study numerically investigates flow control on a swept-back multi-element wing using synthetic jets. To elucidate the differences in control mechanisms between two-dimensional and three-dimensional flows, we focus on the crossflow effect on the flow control mechanism by comparing the results on straight and swept wing configurations. The results show that the crossflow effect plays a crucial role in flow control. The swept wing achieves a lift gain of 10.7% under low-frequency excitation (<i>F</i>⁺ = 1), with relatively uniform spanwise distribution. In contrast, the straight wing exhibits only a 2.3% gain, and its control effect remains localized near the orifice. This limitation can be mitigated through high-frequency excitation at <i>F</i>⁺ = 10, which improves spanwise control effectiveness. Further analysis of the vortex dynamics reveals the underlying mechanism. The background crossflow on the swept wing effectively stretches and tilts the jet-induced vortex structures, promoting a robust spanwise transport of momentum that enables global control. In contrast, vortex structures on the straight wing primarily convect downstream, lacking this inherent spanwise spreading mechanism. These findings offer direct design guidelines for the design of three-dimensional flow control strategies. For the straight wing, the actuators require closely spaced arrangements to achieve global lift enhancement; for the swept wing, a sparse actuator arrangement can enable efficient large-area flow control by utilizing the crossflow effect.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the hydrodynamic similarities between Dujiangyan, an ancient Chinese irrigation system, and human aorta","authors":"Yuheng Yang \u0000 (,&nbsp;),&nbsp;Xiaoning Zhang \u0000 (,&nbsp;),&nbsp;Hongyan Kang \u0000 (,&nbsp;),&nbsp;Zengsheng Chen \u0000 (,&nbsp;),&nbsp;Xiaoyan Deng \u0000 (,&nbsp;),&nbsp;Yubo Fan \u0000 (,&nbsp;),&nbsp;Anqiang Sun \u0000 (,&nbsp;)","doi":"10.1007/s10409-026-51199-x","DOIUrl":"10.1007/s10409-026-51199-x","url":null,"abstract":"<div><p>The unique riverbed profiles and bending reaches of the more than 2000-year-old Dujiangyan Irrigation System (DIS) guarantee relatively stable water supply to the Chengdu Plain, China, with minimal sediment. Similarly, the human aorta buffers the cardiac-induced pulsatile flow through Windkessel effect and reduces the thrombus transport to cerebral vessels through swirling effect of blood flow. This study employs computational simulations and <i>in vitro</i> experiments to analyze the shared hydrodynamic principles between both systems. A three-dimensional (3D) model of the Inner River of DIS was constructed based on data obtained with large-scale prototype observation system. In parallel, 3D aorta models were reconstructed based on medical images, incorporating lumped parameter models as boundary conditions. Both flow pulsatility and helicity-dependent mass transport (sediment in DIS vs. thrombus in aorta) were quantitatively compared. The results have, for the first time, confirmed the amazing similarities in flow characteristics between the DIS and human aorta. The findings provide novel insights for advancing aortic disease therapies and endovascular device design, while opening new perspectives for addressing challenges in flood and sediment management.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 8","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uncertainty quantification and optimization design: theory and applications","authors":"Xu Han,&nbsp;Libin Zhao","doi":"10.1007/s10409-026-60048-x","DOIUrl":"10.1007/s10409-026-60048-x","url":null,"abstract":"<div><div>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 8","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Data-driven deep learning for the inverse problem of thermal quench in HTS tapes","authors":"Denghui Huang \u0000 (,&nbsp;),&nbsp;Shaoyu Zheng \u0000 (,&nbsp;),&nbsp;Peifeng Gao \u0000 (,&nbsp;),&nbsp;Xingzhe Wang \u0000 (,&nbsp;)","doi":"10.1007/s10409-026-51033-x","DOIUrl":"10.1007/s10409-026-51033-x","url":null,"abstract":"<div><p>Predicting and understanding quench in high-temperature superconducting (HTS) materials pose significant challenges due to strong nonlinearity from extreme multifield coupling at cryogenic temperatures, as well the phase transition from the superconducting state to the normal one. Accurately determining the occurrence and location of a quench in HTS tapes, triggered by thermal disturbances, is crucial for advancing superconducting applications, as it requires solving a complex inversion problem. This study develops a deep learning framework to solve this inverse problem for predicting quench phenomena in YBCO tapes. We first construct a coupled forward model based on thermoelastic quench theory to simulate the quench onset and generate a high-fidelity dataset. A convolutional neural network is then designed to directly map temperature and strain distributions to the characteristics of the thermal disturbance, including its location, average power, and duration. The model, trained solely on physics-based simulation data, achieves exceptional performance with a mean relative error of less than 3% and demonstrates strong robustness. Through a transfer learning strategy, the trained network effectively generalizes to challenging scenarios involving noisy and time-series data while maintaining high accuracy, highlighting its superior fault tolerance and feature extraction capability. By integrating the predictive power of deep learning with physically grounded training data, this work provides an accurate and efficient tool for real-time quench prediction, offering a promising pathway to enhance the reliability and performance of superconducting systems.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 11","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bioinspired gradient interfaces in heterogeneous thin films for enhanced robustness and stability of directional adhesion","authors":"Bingzhan Zhu \u0000 (,&nbsp;),&nbsp;Yuan Liu \u0000 (,&nbsp;),&nbsp;Zuoqi Zhang \u0000 (,&nbsp;)","doi":"10.1007/s10409-026-51180-x","DOIUrl":"10.1007/s10409-026-51180-x","url":null,"abstract":"<div><p>Heterogeneous thin films inherently exhibit directional adhesion, where the peeling force increases when peeled in the soft-to-stiff direction and decreases when peeled in the opposite direction compared to their homogeneous counterparts. This unique property offers a basis for designing smart adhesion systems requiring both strong attachment and easy detachment. However, heterogeneous thin films with sharp interfaces suffer from poor adhesion stability and robustness. The maximum peeling force is highly sensitive to the cohesive zone between the thin film and substrate, reducing adhesion robustness. Moreover, a sudden big drop in peeling force happens immediately after the sharp interface, reflecting its poor adhesion stability. Inspired by the gradient designs in adhesive microstructures of beetles and geckos, we propose a bioinspired gradient-interface design for the heterogeneous thin films. A theoretical model is developed to describe the peeling behavior of the gradient-interface heterogeneous thin films. Our results show that gradient interfaces maintain the directional adhesion property while significantly mitigating the impact of cohesive zones on the maximum peeling force, thus enhancing adhesion robustness. With analogy to the redundant design in engineering, three indices are introduced to quantitatively characterize the adhesion strength and stability of practical interest: the half-peak peeling force, the half-peak peeling-zone length, and the half-peak fracture energy. Comparative analysis reveals that the optimal gradient magnitude depends on the gradient form and interface energy. This study uncovers the mechanisms behind robust and stable directional adhesion with gradient-interface heterogeneous thin films and provides valuable insights for the design of smart adhesion systems with strong attachment and easy detachment.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 11","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel magnet-array quasi-zero stiffness energy-harvesting vibration isolator","authors":"Zhaozhao Ma \u0000 (,&nbsp;),&nbsp;Yonghua Yu \u0000 (,&nbsp;),&nbsp;Ruiping Zhou \u0000 (,&nbsp;),&nbsp;Qingchao Yang \u0000 (,&nbsp;),&nbsp;Heow Pueh Lee,&nbsp;Kai Chai \u0000 (,&nbsp;)","doi":"10.1007/s10409-026-25623-x","DOIUrl":"10.1007/s10409-026-25623-x","url":null,"abstract":"<div><p>The vibration issues in various mechanical equipment and architectural structures have gradually developed into two directions: vibration control and vibration utilization. Developing better engineering structures and system models is a crucial step in realizing vibration control and utilization. A novel magnet-array quasi-zero stiffness energy-harvesting vibration isolator (MQZS EVI) is proposed; it mainly consists of three parallel negative stiffness mechanisms (NSMs), three series-connected electromagnetic shunt damping, and three parallel spring positive stiffness mechanisms. Firstly, the magnetic force analytical model of the electromagnetic NSM is established using the filament method and the finite element method. Structural parameter optimization analysis is then conducted for the NSM. Secondly, the dynamic equations of the MQZS EVI system are formulated. The vibration isolation performance and energy-harvesting characteristics of the MQZS EVI system are evaluated using the harmonic balance method and the pseudo-arc length continuation method. Finally, a prototype is manufactured and tested. The experimental results demonstrate that the MQZS EVI system can effectively isolate ultra-low-frequency vibrations while simultaneously capturing energy from low-frequency vibrations.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 11","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ocular injury mechanics under blunt and shock wave impact: a review","authors":"Liwei Yang \u0000 (,&nbsp;),&nbsp;Jing Xie \u0000 (,&nbsp;),&nbsp;Yinze Lei \u0000 (,&nbsp;),&nbsp;Yue Liu \u0000 (,&nbsp;),&nbsp;Zhongkang Zhou \u0000 (,&nbsp;),&nbsp;Wenlong Xu \u0000 (,&nbsp;),&nbsp;Pengwan Chen \u0000 (,&nbsp;),&nbsp;Daniel Rittel","doi":"10.1007/s10409-026-51004-x","DOIUrl":"10.1007/s10409-026-51004-x","url":null,"abstract":"<div><p>This review summarizes the mechanical properties of key ocular structures (cornea, sclera, lens, and vitreous) and systematically evaluates the measurement techniques and data discrepancies. We review here experimental methods for ocular injury loading and three types of injury models: isolated eyeball model, orbit-eyeball model, and head-eyeball model. The construction of numerical ocular models and their application in simulation experiments are analyzed. Based on experimental and simulation results, for blunt eye injuries, the severity of the impact and the resulting damage are influenced by factors such as the mass of the impacting object, its velocity at the time of impact, and the contact area with the eye. For instance, larger masses, higher velocities, and smaller contact areas tend to cause more severe injuries, often extending to the posterior segment of the eye. Therefore, we categorized impactors into less than orbit (LOI) and greater than orbit (GOI), examining their distinct deformation patterns and injury characteristics during loading. For explosive impacts, we analyzed the shockwave propagation path and pressure distribution across structures to elucidate the corresponding injury mechanisms. We further established an eye injury assessment index based on speed and overpressure. The eye rupture thresholds for LOI and GOI are set at 60 and 30 m/s respectively; for shock wave loading, when the overpressure exceeds 0.25 MPa, it will cause relatively severe damage, while when the overpressure is greater than 0.6 MPa, it may lead to severe injuries such as eye rupture. Additionally, recommendations for optimizing measurement, experimental, and simulation methods are provided for future research.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multibody simulation of mechanical systems using the coordinate partitioning method","authors":"Li Zhang \u0000 (,&nbsp;),&nbsp;Suraj Jaiswal,&nbsp;Yongjun Pan \u0000 (,&nbsp;),&nbsp;Aki Mikkola","doi":"10.1007/s10409-026-25497-x","DOIUrl":"10.1007/s10409-026-25497-x","url":null,"abstract":"<div><p>This paper systematically investigates numerical strategies for updating dependent coordinates in multibody dynamics simulations, focusing on resolving the inherent conflict between computational efficiency and numerical accuracy within coordinate partitioning frameworks. Addresses this gap by evaluating three representative methods—Exact coordinate update, Newton increment, and Newton-Raphson—under a unified framework. Benchmark cases include planar two-bar and four-bar mechanisms as well as a spatial slider-crank mechanism. Computational efficiency, constraint violation, energy error, and kinematic accuracy are compared across varying time-step sizes. Results show that the exact update achieves the highest accuracy but at high computational cost, the increment update provides superior speed but deteriorates with larger steps, and the Newton-Raphson update offers a balanced trade-off suitable for general-purpose simulations. Furthermore, we identify dependent coordinate update operations as the dominant computational bottleneck (60%–90% of runtime). These findings provide practical guidelines for selecting update strategies in real-time versus high-accuracy simulations and highlight avenues for performance optimization in complex multibody systems.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 11","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10409-026-25497-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}