Journal of the Indian Institute of Science最新文献_第9页

A Review of Computational Modeling of Fluid-Immersed Flexible Filaments 流体浸没柔性纤维计算建模综述

IF 2.3 4区综合性期刊

Journal of the Indian Institute of Science Pub Date : 2024-04-25 DOI: 10.1007/s41745-024-00423-x

Divyaprakash, Mohit Garg, Ajeet Kumar, Amitabh Bhattacharya

引用次数: 0

A Review of the Accuracy of Direct Numerical Simulation Tools for the Simulation of Non-Spherical Bubble Collapses 非球形气泡坍塌模拟的直接数值模拟工具精度评述

IF 2.3 4区综合性期刊

Journal of the Indian Institute of Science Pub Date : 2024-04-25 DOI: 10.1007/s41745-024-00427-7

Mandeep Saini, Lucas Prouvost, Stephane Popinet, Daniel Fuster

{"title":"A Review of the Accuracy of Direct Numerical Simulation Tools for the Simulation of Non-Spherical Bubble Collapses","authors":"Mandeep Saini, Lucas Prouvost, Stephane Popinet, Daniel Fuster","doi":"10.1007/s41745-024-00427-7","DOIUrl":"10.1007/s41745-024-00427-7","url":null,"abstract":"<div><p>Numerical methods for the simulation of cavitation processes have been developed for more than 50 years. The rich variety of physical phenomena triggered by the collapse of a bubble has several applications in medicine and environmental science but requires the development of sophisticated numerical methods able to capture the presence of sharp interfaces between fluids and solid/elastic materials, the generation of shock waves and the development of non-spherical modes. One important challenge faced by numerical methods is the important temporal and scale separation inherent to the process of bubble collapse, where many effects become predominant during very short time lapses around the instant of minimum radius when the simulations are hardly resolved. In this manuscript, we provide a detailed discussion of the parameters controlling the accuracy of direct numerical simulation in general non-spherical cases, where a new theoretical analysis is presented to generalize existing theories on the prediction of the peak pressures reached inside the bubble during the bubble collapse. We show that the ratio between the gridsize and the minimum radius allows us to scale the numerical errors introduced by the numerical method in the estimation of different relevant quantities for a variety of initial conditions.</p></div>","PeriodicalId":675,"journal":{"name":"Journal of the Indian Institute of Science","volume":"104 1","pages":"205 - 227"},"PeriodicalIF":2.3,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140654132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Computational Models of the Fluid Mechanics of the Stomach 胃流体力学计算模型

IF 2.3 4区综合性期刊

Journal of the Indian Institute of Science Pub Date : 2024-04-25 DOI: 10.1007/s41745-024-00421-z

Sharun Kuhar, Rajat Mittal

{"title":"Computational Models of the Fluid Mechanics of the Stomach","authors":"Sharun Kuhar, Rajat Mittal","doi":"10.1007/s41745-024-00421-z","DOIUrl":"10.1007/s41745-024-00421-z","url":null,"abstract":"<div><p>In the last 2 decades, the interest in developing computational fluid dynamics (CFD) models of the stomach has grown steadily. This bean-shaped organ plays a key role in our digestive system by chemically and physically processing food before emptying it into the intestines. The stomach walls drive the flow of the contents to achieve mixing, grinding, and emptying of the contents. Most computational models prescribe the motion of the walls and solve for the flow field inside the lumen, but some recent models also incorporate fluid–structure interaction between the muscles and the contents. Some models employ a simplified two-dimensional or axisymmetric geometry, while others use anatomically realistic stomach shapes. The emptying mechanism employed by the model and the inclusion, or lack thereof, of the pylorus further add to the nonconformity among the different models. In this review, we summarise these different CFD models of the stomach available in the literature. A comparison between these models with regard to their complexity, validation, and specificity is presented. While there has been rapid progress in the past few years, computational models are still far behind their other physiological counterparts, such as cardiovascular flows.</p></div>","PeriodicalId":675,"journal":{"name":"Journal of the Indian Institute of Science","volume":"104 1","pages":"65 - 76"},"PeriodicalIF":2.3,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140654712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Volume of Fluid Method: A Brief Review 流体体积法：简要回顾

IF 2.3 4区综合性期刊

Journal of the Indian Institute of Science Pub Date : 2024-04-16 DOI: 10.1007/s41745-024-00424-w

Ananthan Mohan, Gaurav Tomar

{"title":"Volume of Fluid Method: A Brief Review","authors":"Ananthan Mohan, Gaurav Tomar","doi":"10.1007/s41745-024-00424-w","DOIUrl":"10.1007/s41745-024-00424-w","url":null,"abstract":"<div><p>Understanding and predicting multiphase flows is of great relevance due to the ubiquitous nature of such flows in both nature and in many industrial applications. Rapid development of high speed computers and problem-specific algorithms in the last 2 decades has enabled the study of multiphase flows through numerical simulations. In this paper, we give a brief overview of different methods used in direct numerical simulations of two-phase flows. In particular, we focus on the volume of fluid (VOF) method used for locating and advecting the interface. VOF method is a mesh based interface capturing method in which a scalar function called void fraction field (which is the ratio of tracked fluid to the cell volume) is advected in order to track the interface position. A geometric VOF algorithm is detailed in this work. which strikes a balance between accuracy, ease of implementation and volume conservation on a structured grid. Another challenge in two-phase flow simulations is the inclusion of surface tension forces accurately. Here, we give a brief overview of Eulerian surface tension models and detail an approach balancing computational cost, curvature estimation and imposed timestep restriction. Finally, we discuss the most recent advances in VOF methods and outline the various numerical challenges we expect to encounter.</p></div>","PeriodicalId":675,"journal":{"name":"Journal of the Indian Institute of Science","volume":"104 1","pages":"229 - 248"},"PeriodicalIF":2.3,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140615161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bio-inspired Flapping Wing Aerodynamics: A Review 受生物启发的拍翼空气动力学：综述

IF 2.3 4区综合性期刊

Journal of the Indian Institute of Science Pub Date : 2024-04-04 DOI: 10.1007/s41745-024-00420-0

M. De Manabendra, Y. Sudhakar, Srinidhi Gadde, Deepthi Shanmugam, S. Vengadesan

引用次数: 0

A Review of Interface-Driven Adaptivity for Phase-Field Modeling of Fluid–Structure Interaction 流固相互作用相场建模的界面驱动自适应性综述

IF 2.3 4区综合性期刊

Journal of the Indian Institute of Science Pub Date : 2024-04-04 DOI: 10.1007/s41745-024-00422-y

Biswajeet Rath, Xiaoyu Mao, Rajeev Jaiman

引用次数: 0

Social Insects: An Evolutionary Journey into Cooperation 社会性昆虫合作的进化之旅

IF 1.8 4区综合性期刊

Journal of the Indian Institute of Science Pub Date : 2023-12-21 DOI: 10.1007/s41745-023-00418-0

Anoushka Dasgupta

引用次数: 0

An Indian Tribute to William Morton Wheeler 印第安人向威廉-莫顿-惠勒致敬

IF 1.8 4区综合性期刊

Journal of the Indian Institute of Science Pub Date : 2023-12-18 DOI: 10.1007/s41745-023-00416-2

Raghavendra Gadagkar

引用次数: 0

Editor’s Desk 编辑台

IF 1.8 4区综合性期刊

Journal of the Indian Institute of Science Pub Date : 2023-12-12 DOI: 10.1007/s41745-023-00417-1

G. K. Ananthasuresh

引用次数: 0

A Tale of Two Wasps and Why We Should Listen to It 两只黄蜂的故事以及我们为什么要倾听它的声音

IF 1.8 4区综合性期刊

Journal of the Indian Institute of Science Pub Date : 2023-12-11 DOI: 10.1007/s41745-023-00415-3

Sujata Deshpande, Anindita Bhadra

{"title":"A Tale of Two Wasps and Why We Should Listen to It","authors":"Sujata Deshpande, Anindita Bhadra","doi":"10.1007/s41745-023-00415-3","DOIUrl":"10.1007/s41745-023-00415-3","url":null,"abstract":"<div><p>Hymenopterans present a fascinating diversity of social organisation, from solitary individuals building unprotected nests like the potter wasps to the very complex and highly organised societies of honey bees and most ants. A large number of paper wasps have intermediate levels of social complexity, and are designated as primitively eusocial, as they lack a morphologically distinct queen caste. Nevertheless, they have behaviourally distinct queens and workers, and are excellent model systems for understanding the intermediate steps in the process of social evolution, from solitary to complex social systems. Of the many facets of social organisation, the regulation of work in the colony and the establishment and maintenance of reproductive monopoly are the two aspects that are the most intriguing to sociobiologists<i>. Ropalidia marginata</i> and <i>Ropalidia cyathiformis</i> are two species of closely related paper wasps that are found in peninsular India, in the same habitat, and have much overlap in their ecology and ethology. However, this duo is also an interesting study in contrast in several aspects of social behaviour. Hence, together, they present an excellent opportunity for comparative study, to identify crucial steps in social evolution. In this article, we provide an overview of a series of studies that have been conducted by Prof. Raghavendra Gadagkar and his team over 4 decades at the Indian Institute of Science, Bengaluru, to unravel the evolutionary tale that these two species together elucidate.</p></div>","PeriodicalId":675,"journal":{"name":"Journal of the Indian Institute of Science","volume":"103 4","pages":"1065 - 1092"},"PeriodicalIF":1.8,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138573141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0