Dynamics最新文献_第3页

Non-Symmetry in the Shock Refraction at a Closed Interface as a Recovery Mechanism 封闭界面上冲击折射的非对称性是一种恢复机制

Dynamics Pub Date : 2024-01-10 DOI: 10.3390/dynamics4010004

A. Markhotok

引用次数: 0

Multiplicative Renormalization of Stochastic Differential Equations for the Abelian Sandpile Model 阿贝尔沙堆模型随机微分方程的乘法重正化

Dynamics Pub Date : 2024-01-04 DOI: 10.3390/dynamics4010003

Dimitri Volchenkov

引用次数: 0

Implementation and Validation of Explicit Immersed Boundary Method and Lattice Boltzmann Flux Solver in OpenFOAM 在 OpenFOAM 中实现和验证显式沉浸边界法和晶格玻尔兹曼通量求解器

Dynamics Pub Date : 2024-01-03 DOI: 10.3390/dynamics4010002

Yangyang Liu, Ziying Zhang, Hua Zhang, Yaguang Liu

{"title":"Implementation and Validation of Explicit Immersed Boundary Method and Lattice Boltzmann Flux Solver in OpenFOAM","authors":"Yangyang Liu, Ziying Zhang, Hua Zhang, Yaguang Liu","doi":"10.3390/dynamics4010002","DOIUrl":"https://doi.org/10.3390/dynamics4010002","url":null,"abstract":"In this work, the explicit boundary-condition-enforced immersed boundary method (EIBM) and the lattice Boltzmann flux solver (LBFS) are integrated into OpenFOAM to efficiently solve incompressible flows with complex geometries and moving boundaries. The EIBM applies the explicit technique to greatly improve the computational efficiency of the original boundary-condition-enforced immersed boundary method. In addition, the improved EIBM inherits the accurate interpretation of the no-slip boundary condition and the simple implementation from the original one. The LBFS uses the finite volume method to discretize the recovered macroscopic governing equations from the lattice Boltzmann equation. It enjoys the explicit relationship between the pressure and density, which avoids solving the pressure Poisson equation and thus saves much computational cost. Another attractive feature of the LBFS lies in its simultaneous evaluation of the inviscid and viscous fluxes. OpenFOAM, as an open-source CFD platform, has drawn increasing attention from the CFD community and has been proven to be a powerful tool for various problems. Thus, implementing the EIBM and LBFS into such a popular platform can advance the practical application of these two methods and may provide an effective alternative for complicated incompressible flow problems. The performance of the integrated solver in OpenFOAM is comprehensively assessed by comparing it with the widely used numerical solver in OpenFOAM, namely, the Pressure-Implicit with Splitting of Operators (PISO) algorithm with the IBM. A series of representative test cases with stationary and moving boundaries are simulated. Numerical results confirm that the present method does not have any streamline penetration and achieves the second-order accuracy in space. Therefore, the present method implemented in the open-source platform OpenFOAM may have good potential and can serve as a powerful tool for practical engineering problems.","PeriodicalId":507568,"journal":{"name":"Dynamics","volume":"47 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139389023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamics of Fricke–Painlevé VI Surfaces Fricke-Painlevé VI 曲面的动力学特性

Dynamics Pub Date : 2024-01-02 DOI: 10.3390/dynamics4010001

Michel Planat, David Chester, K. Irwin

引用次数: 0

Cooperative Robot Manipulators Dynamical Modeling and Control: An Overview 合作机器人机械手动态建模与控制：概述

Dynamics Pub Date : 2023-12-11 DOI: 10.3390/dynamics3040045

Amin Ghorbanpour

{"title":"Cooperative Robot Manipulators Dynamical Modeling and Control: An Overview","authors":"Amin Ghorbanpour","doi":"10.3390/dynamics3040045","DOIUrl":"https://doi.org/10.3390/dynamics3040045","url":null,"abstract":"Robot manipulators possess the capability to autonomously execute complex sequences of actions. Their proficiency in handling challenging and hazardous tasks has led to their widespread adoption across diverse sectors, including industry, business, household appliances, rehabilitation, and many more. However, certain tasks prove to be challenging for individual robots, primarily due to constraints in their structure and limited degrees of freedom. Cooperative robot manipulators (CRMs) emerge as a compelling solution when dealing with large, heavy, or flexible payloads. The utilization of CRMs offers a host of benefits, including enhanced manipulation performance achieved through the synergy of sensing and actuation capabilities or by tapping into increased redundancy. Numerous techniques have been devised for the control and dynamical modeling of CRMs. Nevertheless, the field continues to present technical challenges and scientific inquiries. To inspire and facilitate further research and development in this realm, this review aims to consolidate the current body of knowledge pertaining to CRMs kinematics, dynamics modeling, and various control methodologies used for payload manipulation via CRMs.","PeriodicalId":507568,"journal":{"name":"Dynamics","volume":"16 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139184013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Alignment-Free Explanation for Collective Predator Evasion in Moving Animal Groups 移动动物群体集体躲避捕食者的无对准解释

Dynamics Pub Date : 2023-11-15 DOI: 10.3390/dynamics3040043

Daniel Strömbom, Catherine Futterman

{"title":"An Alignment-Free Explanation for Collective Predator Evasion in Moving Animal Groups","authors":"Daniel Strömbom, Catherine Futterman","doi":"10.3390/dynamics3040043","DOIUrl":"https://doi.org/10.3390/dynamics3040043","url":null,"abstract":"Moving animal groups consist of many distinct individuals but can operate and function as one unit when performing different tasks. Effectively evading unexpected predator attacks is one primary task for many moving groups. The current explanation for predator evasion responses in moving animal groups require the individuals in the groups to interact via (velocity) alignment. However, experiments have shown that some animals do not use alignment. This suggests that another explanation for the predator evasion capacity in at least these species is needed. Here we establish that effective collective predator evasion does not require alignment, it can be induced via attraction and repulsion alone. We also show that speed differences between individuals that have directly observed the predator and those that have not influence evasion success and the speed of the collective evasion process, but are not required to induce the phenomenon. Our work here adds collective predator evasion to a number of phenomena previously thought to require alignment interactions that have recently been shown to emerge from attraction and repulsion alone. Based on our findings we suggest experiments and make predictions that may lead to a deeper understanding of not only collective predator evasion but also collective motion in general.","PeriodicalId":507568,"journal":{"name":"Dynamics","volume":"17 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139273666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0