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Progress in Computational Fluid Dynamics最新文献

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Aerodynamic design and computational fluid dynamic analysis of radial outflow turbines for steam Rankine cycle and supercritical carbon dioxide Brayton cycle 蒸汽朗肯循环和超临界二氧化碳布雷顿循环径向流出涡轮气动设计与计算流体动力学分析
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-02-16 DOI: 10.1504/PCFD.2021.10035697
Vijayaraj Kunniyoor, Punit Singh, Karthik Nadella
{"title":"Aerodynamic design and computational fluid dynamic analysis of radial outflow turbines for steam Rankine cycle and supercritical carbon dioxide Brayton cycle","authors":"Vijayaraj Kunniyoor, Punit Singh, Karthik Nadella","doi":"10.1504/PCFD.2021.10035697","DOIUrl":"https://doi.org/10.1504/PCFD.2021.10035697","url":null,"abstract":"The first part of this paper presents the design of a radial outflow steam turbine for a micro steam power pump block of 200 kW capacity based on a unique Ljungstrom turbine design methodology. Computational fluid dynamic (CFD) simulations were carried out for the 18-stage radial outflow steam turbine at design and off-design points, and results proved the validity of the undertaken design methodology. The design point CFD simulation showed a total to total efficiency of 74.4% for the steam turbine. Specific speed and specific diameter values for the radial outflow steam turbine stages were calculated and superimposed on the Balje's specific speed-specific diameter chart, thus identifying a unique radial outflow turbine zone in the chart. The second part of this paper presents a new design methodology based on specific speed and specific diameter values for designing a supercritical carbon dioxide radial outflow turbine for a 1 MW supercritical carbon dioxide (SCO2) Brayton cycle. CFD simulations were carried out at design and off-design points for the SCO2 turbine. The total to total efficiency from the CFD simulation at the design point for the SCO2 turbine is 84.6%.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42207048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficiency of particle search methods in smoothed particle hydrodynamics: a comparative study (part I) 光滑粒子流体力学中粒子搜索方法的效率比较研究(第一部分)
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-01-06 DOI: 10.1504/pcfd.2021.10034692
E. Plaza, L. Sigalotti, Luis Pérez, J. Troconis, Wilfredo Angulo, M. Castro
{"title":"Efficiency of particle search methods in smoothed particle hydrodynamics: a comparative study (part I)","authors":"E. Plaza, L. Sigalotti, Luis Pérez, J. Troconis, Wilfredo Angulo, M. Castro","doi":"10.1504/pcfd.2021.10034692","DOIUrl":"https://doi.org/10.1504/pcfd.2021.10034692","url":null,"abstract":"Nearest neighbour searching is central to the efficiency of smoothed particle hydrodynamics (SPH). Here the performance of the brute force (BF) or direct search (DS), the cell-linked list (CLL), and the KD-tree (KDT) methods in vectorised form are analysed. The results indicate that the efficiency of the SPH calculations is improved with the vectorised cell-linked list (VCLL) and the vectorised KD-tree (VKDT). However, the VKDT approach is more efficient than the VCLL method for N ≤ 105 in two dimensions (2D) and N ≤ 106 in three dimensions (3D). For larger N, the time duration of the SPH calculations with the VKDT method grows steeply while a linear trend is maintained with the VCLL. The complexity here is measured not only for early events but also close to the point of hardware limit, in which the complexity has a different behaviour, which can be measured and compared using a power fit.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41816823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical simulation on heat transfer of nanofluid in conical spiral heat exchanger 纳米流体在锥形螺旋换热器中的传热数值模拟
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-01-06 DOI: 10.1504/pcfd.2021.10034691
A. Davoudi, S. Daneshmand, V. Monfared, K. Mohammadzadeh
{"title":"Numerical simulation on heat transfer of nanofluid in conical spiral heat exchanger","authors":"A. Davoudi, S. Daneshmand, V. Monfared, K. Mohammadzadeh","doi":"10.1504/pcfd.2021.10034691","DOIUrl":"https://doi.org/10.1504/pcfd.2021.10034691","url":null,"abstract":"In this research article, the performance of a conical spiral heat exchanger with rectangular cross sections is numerically investigated by using two different nanofluids, aluminium oxide/water (Al2O3/water) and copper oxide/water (CuO/water) nanofluid. For this purpose, the effects of nanofluid concentration on the secondary flow, pressure drop, heat transfer and figure of merit (FOM) (the ratio of total heat transfer to the required fluid for pumping) are investigated. On the structured grid, the continuity, momentum, and energy equations are solved by employing a finite volume method. Results indicate that by enhancing the concentration of a nanofluid, the formed secondary flow gains more power. Based on the obtained results, the pressure drop increases with enhancing the nanofluid concentration along the tube. The heat transfer rate is slightly increased by adding nanoparticles to the base water fluid in very low concentrations, but with increasing the concentration of nanofluids, the heat transfer rate reduces. Moreover, FOM decreases with increasing nanofluid concentration. This variation is higher for copper oxide compared to alumina nanofluids at lower concentrations, while it is higher for alumina nanofluid at higher concentrations.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42136151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Supercritical carbon dioxide turbomachinery development using scaling methodology, computational fluid dynamics and experimental testing in aeroloop 利用标度法、计算流体动力学和空气循环试验开发超临界二氧化碳涡轮机械
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-01-06 DOI: 10.1504/PCFD.2021.10034689
Vijayaraj Kunniyoor, Punit Singh
{"title":"Supercritical carbon dioxide turbomachinery development using scaling methodology, computational fluid dynamics and experimental testing in aeroloop","authors":"Vijayaraj Kunniyoor, Punit Singh","doi":"10.1504/PCFD.2021.10034689","DOIUrl":"https://doi.org/10.1504/PCFD.2021.10034689","url":null,"abstract":"Supercritical carbon dioxide (SCO2) turbomachinery design experience is limited. This paper examines similarity-based scaling strategy to develop a radial inflow turbine and a centrifugal compressor from existing proven designs for a 50 kWe SCO2 Brayton cycle. The SCO2 turbine and compressor are developed from well-established NASA 1730 air turbine and NASA 4613 radial pump, respectively. Computational fluid dynamic (CFD) simulations with air and SCO2 and experimental testing in aeroloop are carried out for the developed turbomachinery. The results are compared with original NASA test data. For the turbine, the CFD simulation and experimental results were in good agreement with NASA data. For the compressor, CFD simulation results with SCO2 showed good conformance especially the efficiency values, which were much lower for air. The compressor experimental results were well away from the NASA data when head rise coefficient was considered, but the flow coefficient zone coincided with that of simulation.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42316594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fluid-structure interaction analysis of the return pipeline in the high-pressure and large-flow-rate hydraulic power system 高压大流量液压动力系统回路流固耦合分析
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-01-06 DOI: 10.1504/pcfd.2021.10034687
Y. Sang, Pengkun Liu, W. Xudong, Weiqi Sun, Jianlong Zhao
{"title":"Fluid-structure interaction analysis of the return pipeline in the high-pressure and large-flow-rate hydraulic power system","authors":"Y. Sang, Pengkun Liu, W. Xudong, Weiqi Sun, Jianlong Zhao","doi":"10.1504/pcfd.2021.10034687","DOIUrl":"https://doi.org/10.1504/pcfd.2021.10034687","url":null,"abstract":"This paper aims to investigate the dynamic characteristic of the return pipeline in the high-pressure and large-flow-rate hydraulic power system. First, the geometry model of the pipeline is established, and a one-way coupling fluid structure method is introduced. The modal analyses with empty and filled pipelines are performed and compared. Then, the pipeline resonance phenomenon is investigated, and the response frequency is achieved by the fast Fourier transformation (FFT) analysis, the results are inconsistent with the experiments. Besides, the dynamic response of the pipeline is simulated. Dynamic mesh and user define function (UDF) are adopted, and the pipeline vibration and water hammer phenomenon are observed. Finally, the dynamic characteristics of the pipeline under different fluid velocities and wall thickness are investigated. The results show that the pipeline valve-induced vibration cannot be lightened by reducing the fluid inlet velocity but can be significantly mitigated by increasing the wall thickness.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48902276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Numerical and experimental investigation of sloshing in a water tank with a fully coupled fluid-structure interaction method 基于完全耦合流固耦合方法的水箱晃动数值与实验研究
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-01-01 DOI: 10.1504/PCFD.2021.10035698
A. Demir, A. Dinçer, Şevki Öztürk, lker Kazaz
{"title":"Numerical and experimental investigation of sloshing in a water tank with a fully coupled fluid-structure interaction method","authors":"A. Demir, A. Dinçer, Şevki Öztürk, lker Kazaz","doi":"10.1504/PCFD.2021.10035698","DOIUrl":"https://doi.org/10.1504/PCFD.2021.10035698","url":null,"abstract":"","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66709988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Numerical simulations of the transverse injection and mixing with a Mach 3 supersonic cross-flow 3马赫超音速横流横向喷射与混合的数值模拟
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-01-01 DOI: 10.1504/pcfd.2021.10039612
Sagarika Iyyer, V. Babu
{"title":"Numerical simulations of the transverse injection and mixing with a Mach 3 supersonic cross-flow","authors":"Sagarika Iyyer, V. Babu","doi":"10.1504/pcfd.2021.10039612","DOIUrl":"https://doi.org/10.1504/pcfd.2021.10039612","url":null,"abstract":"","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66710679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of ground on the shape optimisation of a symmetric aerofoil at low angles of attack 地面对低迎角对称翼型优化的影响
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-01-01 DOI: 10.1504/PCFD.2021.10037998
J. P. Narayanan, Dennis Joseph, Ajith Kumar Arumugham Achari
{"title":"Effect of ground on the shape optimisation of a symmetric aerofoil at low angles of attack","authors":"J. P. Narayanan, Dennis Joseph, Ajith Kumar Arumugham Achari","doi":"10.1504/PCFD.2021.10037998","DOIUrl":"https://doi.org/10.1504/PCFD.2021.10037998","url":null,"abstract":"","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66710615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
DNS of wake from perforated plates: aspect ratio effects 穿孔板尾迹的DNS:纵横比效应
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-01-01 DOI: 10.1504/pcfd.2021.10042801
Abhinav Singh, V. Narasimhamurthy
{"title":"DNS of wake from perforated plates: aspect ratio effects","authors":"Abhinav Singh, V. Narasimhamurthy","doi":"10.1504/pcfd.2021.10042801","DOIUrl":"https://doi.org/10.1504/pcfd.2021.10042801","url":null,"abstract":"","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66710782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Coupled natural convection and radiation in a cubic cavity filled with an air - H_2O mixture in the presence of a heated obstacle 在充满空气- h2o混合物的立方腔中，在加热障碍物存在的情况下，自然对流和辐射的耦合
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-01-01 DOI: 10.1504/pcfd.2021.10042895
D. Lemonnier, D. Saury, X. Nguyen
{"title":"Coupled natural convection and radiation in a cubic cavity filled with an air - H_2O mixture in the presence of a heated obstacle","authors":"D. Lemonnier, D. Saury, X. Nguyen","doi":"10.1504/pcfd.2021.10042895","DOIUrl":"https://doi.org/10.1504/pcfd.2021.10042895","url":null,"abstract":"","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66710824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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