Physical review. E最新文献_第3页

Koopman reduced-order modeling and analysis of flag flapping in the wake of a cylinder. 圆柱尾迹中旗子扑动的Koopman降阶建模与分析。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-04-01 DOI: 10.1103/PhysRevE.111.045101

Haokui Jiang, Jean-Lou Pfister, Daniel Zhengyu Huang, Shunxiang Cao

{"title":"Koopman reduced-order modeling and analysis of flag flapping in the wake of a cylinder.","authors":"Haokui Jiang, Jean-Lou Pfister, Daniel Zhengyu Huang, Shunxiang Cao","doi":"10.1103/PhysRevE.111.045101","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.045101","url":null,"abstract":"We develop a Koopman reduced-order model (ROM) to analyze the instability mechanism and predict the hydrodynamic behavior for the flag flapping in the wake of a cylinder. The Koopman ROM is constructed using a kernel dynamic mode decomposition method and enhanced through a residual dynamical mode decomposition algorithm, which improves accuracy by identifying and eliminating spurious modes. Our analysis reveals a flow transition from the \"2S\" mode in the periodic phase to the \"2P\" mode in the quasiperiodic phase, with the main Koopman mode M_{1} providing insights into the instability mechanism. In the case of chaotic flapping at a Reynolds number of Re=1200, the Koopman ROM demonstrates high accuracy in predicting the chaotic fluid-structure interaction flow when comparing the fractal dimension d_{c} and the maximum Lyapunov exponent λ_{max} of the true and reconstructed flow. Additionally, we observe similar flag flapping and vortex shedding characteristics in the near-structure region throughout the investigated Reynolds number range Re∈[500,1200], leading to similar vorticity patterns for M_{1}. The flag flapping has a local minimum displacement at position x_{0}≈3.0 in the flag's displacement envelope. Notably, this position closely matches the critical position x_{c} obtained from global linear instability analysis at low Reynolds numbers. This conclusion aligns with the performance of the Koopman ROM using sparse measurement probes attached to the flag. The position of the probes influences the accuracy of the ROM, where higher accuracy corresponds to a larger displacement of the eigenfunction.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 4-2","pages":"045101"},"PeriodicalIF":2.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144136410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Physical meaning of principal component analysis for classical lattice systems with translational invariance. 经典格系平移不变性主成分分析的物理意义。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-04-01 DOI: 10.1103/PhysRevE.111.045301

Su-Chan Park

引用次数: 0

Quantum entanglement of linearly coupled quantum harmonic oscillators. 线性耦合量子谐振子的量子纠缠。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-04-01 DOI: 10.1103/PhysRevE.111.044140

D N Makarov, K A Makarova

引用次数: 0

Static and hydrodynamic periodic structures induced by ac electric fields in the antiferroelectric SmZ_{A} phase. 交流电场诱导的反铁电SmZ_{A}相静态和流体动力周期结构。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-04-01 DOI: 10.1103/PhysRevE.111.045420

K S Krishnamurthy, S Krishna Prasad, D S Shankar Rao, R J Mandle, C J Gibb, J Hobbs, N V Madhusudana

{"title":"Static and hydrodynamic periodic structures induced by ac electric fields in the antiferroelectric SmZ_{A} phase.","authors":"K S Krishnamurthy, S Krishna Prasad, D S Shankar Rao, R J Mandle, C J Gibb, J Hobbs, N V Madhusudana","doi":"10.1103/PhysRevE.111.045420","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.045420","url":null,"abstract":"We report the effect of AC electric fields in the range of 0.1-300 kHz on antiferroelectric SmZ_{A} layers of DIO in the bookshelf geometry. Significant results are (a) primary bifurcation into a quasistationary periodic instability with its voltage threshold U_{c} and wave vector q_{c} along the initial director being, respectively, quadratic and linear functions of f over 10-150 kHz, and with an azimuthal distortion of the director n which changes sign between adjacent stripes, (b) transition from the modulated state to a homogeneous state at higher voltages, and (c) third bifurcation into traveling wave periodic state on further rise in U in the region 10-40 kHz. We interpret these findings as follows. The low voltage instability is very similar to that seen in the higher temperature apolar nematic phase and is the electrohydrodynamic (EHD) instability possibly belonging to the region of dielectric inversion frequency. The azimuthal distortions of n result from an undulatory distortion of the SmZ_{A} layers in the book-shelf geometry. The intermediate homogeneous state of SmZ_{A} in which the periodic structure is absent results from a linear coupling between the layer polarization P and applied field E, giving rise to a scissoring type mutual P reorientation in adjacent layers. Finally, at even higher voltages, the medium goes over to a field-induced transition to the ferroelectric nematic, with the polarization following the AC field, and the periodic EHD instability being similar to that of the dielectric regime. The polar vector symmetry of the medium leads in general to traveling waves.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 4-2","pages":"045420"},"PeriodicalIF":2.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144136527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulating squirmers with smoothed particle dynamics. 用平滑粒子动力学模拟蠕动。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-04-01 DOI: 10.1103/PhysRevE.111.045401

Xinwei Cai, Kuiliang Wang, Gaojin Li, Xin Bian

{"title":"Simulating squirmers with smoothed particle dynamics.","authors":"Xinwei Cai, Kuiliang Wang, Gaojin Li, Xin Bian","doi":"10.1103/PhysRevE.111.045401","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.045401","url":null,"abstract":"Microswimmers play an important role in shaping the world around us. The squirmer is a simple model of a microswimmer whose cilia oscillations on its spherical surface induce an effective slip velocity to propel itself. The rapid development of computational fluid dynamics methods has markedly enhanced our capacity to study the behavior of squirmers in aqueous environments. Nevertheless, a unified methodology that can fully address the complexity of fluid-solid coupling at multiple scales and interface tracking for multiphase flows remains elusive, posing an outstanding challenge to the field. To this end, we investigate the potential of the smoothed particle dynamics (SPD) method as an alternative approach to simulating squirmers. The Lagrangian nature of the method allows it to effectively address the aforementioned difficulty. By introducing a novel treatment of the boundary condition and assigning appropriate slip velocities to the boundary particles, the SPD squirmer model is able to accurately represent a range of microswimmer types, including pushers, neutral swimmers, and pullers. We systematically validate the steady-state velocity of the squirmer, the resulting flow field, its hydrodynamic interactions with the surrounding environment, and the mutual collision of two squirmers. In the presence of Brownian motion, the model is also able to correctly calculate the velocity and angular velocity autocorrelation functions at the mesoscale. Finally, we simulate a squirmer within a multiphase flow by considering a droplet that encloses a squirmer and imposing a surface tension between the two flow phases. We find that the squirmer within the droplet exhibits different motion types. Since the proposed method is applicable to a wide range of complex scenarios, it has implications for a number of areas, including the design and application of micro and/or nano artificial swimmers, flow manipulation in microfluidic chips, and drug delivery in the biomedical field.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 4-2","pages":"045401"},"PeriodicalIF":2.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144136558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial organization of multiple species of active particles interacting with an interface. 与界面相互作用的多种活性粒子的空间组织。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-04-01 DOI: 10.1103/PhysRevE.111.045412

Love Grover, Rajeev Kapri, Abhishek Chaudhuri

引用次数: 0

Revisiting classical nucleation theory: Insights into heterogeneous ice nucleation on nanoscale substrates. 重温经典成核理论：对纳米尺度基底上非均相冰成核的见解。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-04-01 DOI: 10.1103/PhysRevE.111.044107

Yufeng Liu, Jincheng Zeng, Yu Zhang, Jianyang Wu, Zhisen Zhang

{"title":"Revisiting classical nucleation theory: Insights into heterogeneous ice nucleation on nanoscale substrates.","authors":"Yufeng Liu, Jincheng Zeng, Yu Zhang, Jianyang Wu, Zhisen Zhang","doi":"10.1103/PhysRevE.111.044107","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.044107","url":null,"abstract":"Heterogeneous nucleation plays a pivotal role in the ice nucleation process. Within the classical nucleation theory (CNT) framework, the heterogeneous nucleation rate is proportional to the substrate surface area, typically assuming infinite substrate surfaces. However, when the substrate size approaches the nanoscale, the nucleation rate deviates significantly from CNT predictions. This study presents a novel theoretical model that distinguishes the nanoscale substrate into central and edge regions, attributing different contributions to ice nucleation. We hypothesize that the edge width equals the critical size of the nucleus (r_{c}) and validate this hypothesis using molecular dynamics (MD) simulations with the coarse-grained water model (mW model) on circular and rectangular substrates of varying sizes. Our results demonstrate that the edge region impedes heterogeneous ice nucleation, with the MD calculated nucleation rates aligning well with our model. Furthermore, the statistical edge width matches the critical nucleus size r_{c}. By incorporating this refined model, our findings reconcile the nucleation rates with CNT predictions, offering new insights into heterogeneous ice nucleation at the nanoscale.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 4-1","pages":"044107"},"PeriodicalIF":2.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144136572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ring-shaped linear waves and solitons in a square lattice of acoustic waveguides. 声波导方形晶格中的环形线性波和孤子。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-04-01 DOI: 10.1103/PhysRevE.111.044201

I Ioannou Sougleridis, O Richoux, V Achilleos, G Theocharis, D J Frantzeskakis

引用次数: 0

Structural balance and evolution of cooperation in a population with hybrid interactions. 混合相互作用下群体合作的结构平衡与演化。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-04-01 DOI: 10.1103/PhysRevE.111.044309

Liming Zhang, Lan Zhang, Shun Gao, Changwei Huang, Qionglin Dai

{"title":"Structural balance and evolution of cooperation in a population with hybrid interactions.","authors":"Liming Zhang, Lan Zhang, Shun Gao, Changwei Huang, Qionglin Dai","doi":"10.1103/PhysRevE.111.044309","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.044309","url":null,"abstract":"This study explores the evolution of cooperation in populations with mixed pairwise and three-body interactions, investigating the impact of higher-order interaction density ρ and individual interaction preference α. Our results reveal that sparse higher-order interactions markedly boost cooperation, exhibiting two critical phase transitions as ρ changes. These transitions underscore the delicate equilibrium needed for optimal cooperation, as excessive higher-order interactions can diminish returns. The preference parameter α significantly influences cooperation sustainability, with intermediate values maximizing cooperative outcomes, particularly when the temptation to defect r is not strong. Crucially, our findings demonstrate that hybrid social dilemmas structurally encode emergent cooperation pathways that are unattainable within homogeneous interaction frameworks, emphasizing the importance of modeling mixed interactions to capture real-world complexity. These insights offer valuable guidance for designing systems aimed at promoting cooperative behavior across social, ecological, and artificial domains.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 4-1","pages":"044309"},"PeriodicalIF":2.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144136605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Swimming dynamics of a spheroidal microswimmer near a wall. 近壁球形微游泳者的游泳动力学。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-04-01 DOI: 10.1103/PhysRevE.111.045106

Yan Xia, Zhaosheng Yu, Minkang Zhang, Zhaowu Lin, Zhenyu Ouyang

引用次数: 0