A Mixed Zero-equation and One-equation Turbulence Model in Fluid-film Thrust Bearings

IF 2.2 3区 工程技术 Q2 ENGINEERING, MECHANICAL Journal of Tribology-transactions of The Asme Pub Date : 2023-10-30 DOI:10.1115/1.4063945
Xin Deng
{"title":"A Mixed Zero-equation and One-equation Turbulence Model in Fluid-film Thrust Bearings","authors":"Xin Deng","doi":"10.1115/1.4063945","DOIUrl":null,"url":null,"abstract":"Abstract A thrust bearing is a rotary bearing that facilitates rotational movement between components and is specifically engineered to provide support for a load that is parallel to the axis of rotation. The generation of the inter-surface film pressure is attributed to the relative motion (rotation) of the surfaces, which results in the lubricant being drawn into the converging wedge formed between them. The interface between the unmovable and moving parts is demarcated by a slender layer of lubricating fluid, including but not limited to oil, water, air, or other process fluid. The conventional zero-equation model can be enhanced to achieve higher precision in forecasting and reduce dependence on empirical data, owing to its inherent limitations. A novel turbulence model that combines zero-equation and one-equation approaches has been developed and implemented in the recently introduced modeling tool package for thrust bearings. In the Prandtl one-equation turbulence model, the length scale is a necessary but undetermined term. A novel mixed model has been implemented utilizing the Prandtl one equation along with a novel length scale. The tool package is a Thermo-hydrodynamic (THD) code that involves iterative computations between the Reynolds' equation, turbulence equation, energy equation within the film, and conduction equation in pad and runner. The new model yields an eddy viscosity that exhibits a substantial level of proximity to both Eddy Viscosity Transport (EVT) and Direct Numerical Simulation (DNS), and exhibits significant enhancements in comparison to the traditional Ng-Pan zero-equation turbulence model.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":"719 ","pages":"0"},"PeriodicalIF":2.2000,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Tribology-transactions of The Asme","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1115/1.4063945","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0

Abstract

Abstract A thrust bearing is a rotary bearing that facilitates rotational movement between components and is specifically engineered to provide support for a load that is parallel to the axis of rotation. The generation of the inter-surface film pressure is attributed to the relative motion (rotation) of the surfaces, which results in the lubricant being drawn into the converging wedge formed between them. The interface between the unmovable and moving parts is demarcated by a slender layer of lubricating fluid, including but not limited to oil, water, air, or other process fluid. The conventional zero-equation model can be enhanced to achieve higher precision in forecasting and reduce dependence on empirical data, owing to its inherent limitations. A novel turbulence model that combines zero-equation and one-equation approaches has been developed and implemented in the recently introduced modeling tool package for thrust bearings. In the Prandtl one-equation turbulence model, the length scale is a necessary but undetermined term. A novel mixed model has been implemented utilizing the Prandtl one equation along with a novel length scale. The tool package is a Thermo-hydrodynamic (THD) code that involves iterative computations between the Reynolds' equation, turbulence equation, energy equation within the film, and conduction equation in pad and runner. The new model yields an eddy viscosity that exhibits a substantial level of proximity to both Eddy Viscosity Transport (EVT) and Direct Numerical Simulation (DNS), and exhibits significant enhancements in comparison to the traditional Ng-Pan zero-equation turbulence model.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
流体膜推力轴承的混合零方程和单方程湍流模型
推力轴承是一种旋转轴承,它促进了部件之间的旋转运动,并专门设计用于支持平行于旋转轴的负载。表面间膜压力的产生是由于表面的相对运动(旋转),导致润滑剂被吸入它们之间形成的会聚楔形。不可移动部件和活动部件之间的界面由一细长的润滑流体层划分,润滑流体包括但不限于油、水、空气或其他工艺流体。传统的零方程模型由于其固有的局限性,可以提高预测精度,减少对经验数据的依赖。在最近推出的推力轴承建模工具包中,开发了一种结合零方程和单方程方法的新型湍流模型。在Prandtl单方程湍流模型中,长度尺度是一个必要但不确定的项。利用普朗特一方程和新的长度尺度实现了一种新的混合模型。该工具包是一个热流体动力学(THD)代码,包括雷诺方程、湍流方程、膜内能量方程以及垫层和流道内的传导方程之间的迭代计算。新模型产生的涡流黏度与涡流黏度输运(EVT)和直接数值模拟(DNS)相当接近,与传统的Ng-Pan零方程湍流模型相比有显著增强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
Journal of Tribology-transactions of The Asme
Journal of Tribology-transactions of The Asme 工程技术-工程:机械
CiteScore
4.20
自引率
12.00%
发文量
117
审稿时长
4.1 months
期刊介绍: The Journal of Tribology publishes over 100 outstanding technical articles of permanent interest to the tribology community annually and attracts articles by tribologists from around the world. The journal features a mix of experimental, numerical, and theoretical articles dealing with all aspects of the field. In addition to being of interest to engineers and other scientists doing research in the field, the Journal is also of great importance to engineers who design or use mechanical components such as bearings, gears, seals, magnetic recording heads and disks, or prosthetic joints, or who are involved with manufacturing processes. Scope: Friction and wear; Fluid film lubrication; Elastohydrodynamic lubrication; Surface properties and characterization; Contact mechanics; Magnetic recordings; Tribological systems; Seals; Bearing design and technology; Gears; Metalworking; Lubricants; Artificial joints
期刊最新文献
Experimental investigations on the development of hybrid metal matrix composite of Al7075 on microstructural, mechanical, and dry sliding aspects Structural optimization of the main bearing in a tunnel boring machine considering clearance Improved wear profile modelling of planetary roller screw mechanism with thread optimization Nano Magnesium silicate hydroxide as synergistic lubricant additive with micro carbon sphere for enhanced tribological properties Recent progress on the tribological applications of solid lubricants
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1