Volume 2: Computational Fluid Dynamics最新文献_第4页

A Robust Aerodynamic Optimization Design for Airfoil Based on Interval Uncertainty Analysis Method 基于区间不确定性分析法的翼型鲁棒气动优化设计

Volume 2: Computational Fluid Dynamics Pub Date : 2019-07-28 DOI: 10.1115/ajkfluids2019-5426

Xin Song, Guannan Zheng, Guowei Yang

{"title":"A Robust Aerodynamic Optimization Design for Airfoil Based on Interval Uncertainty Analysis Method","authors":"Xin Song, Guannan Zheng, Guowei Yang","doi":"10.1115/ajkfluids2019-5426","DOIUrl":"https://doi.org/10.1115/ajkfluids2019-5426","url":null,"abstract":"\u0000 Uncertainties will make aircraft deviate from the designed condition, resulting in the decrease in aerodynamic performance and even destruction. This paper presents a fast nonlinear interval analysis method considering geometric uncertainties. DFFD method is used to parameterize the airfoil shape, and the Kriging model for aerodynamic force and uncertainty variables is optimized by PSO algorithm to find the upper and lower bounds of the objective interval. The effects of geometric uncertainties on NACA0012 airfoil are analyzed using the above method. And then, a robust optimization design method is established based on the interval analysis method. FFD method is used to produce the deterministic design variables and the order relation of interval number is employed to transform the uncertain optimization to deterministic multi-objective optimization which is solved by MOPSO based on Pareto entropy. The robust optimization design is implemented for the symmetrical airfoil with the drag objective under geometric uncertainties and thickness constraint, and the results are compared with the deterministic optimization to validate the effectiveness of the developed method.","PeriodicalId":346736,"journal":{"name":"Volume 2: Computational Fluid Dynamics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122207933","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

Reservoir Geomechanical Modeling and Ground Uplift During CO2 Injection Into Khuff Reservoir Khuff储层地质力学建模与CO2注入地层隆升

Volume 2: Computational Fluid Dynamics Pub Date : 2019-07-28 DOI: 10.1115/ajkfluids2019-4809

Sikandar Khan, Y. Khulief, A. Al-Shuhail

引用次数: 1

Wingtip Vortex Stability and Control Using Mean Flow Perturbation 利用平均流摄动控制翼尖涡稳定性

Volume 2: Computational Fluid Dynamics Pub Date : 2019-07-28 DOI: 10.1115/ajkfluids2019-5473

Andrew Bodling, D. Garmann

{"title":"Wingtip Vortex Stability and Control Using Mean Flow Perturbation","authors":"Andrew Bodling, D. Garmann","doi":"10.1115/ajkfluids2019-5473","DOIUrl":"https://doi.org/10.1115/ajkfluids2019-5473","url":null,"abstract":"\u0000 Wingtip vortices generated by aircraft are the source of induced drag. Therefore, flow control devices such as winglets have been created to reduce the impact of tip vortices and consequently improve the wings performance. To use other flow control devices such as periodic heat-flux sources, the receptivity to the actuator must be fully optimized to be effective. The optimization process includes actuator placement, frequency selection and spatial modulation. The Mean Flow Perturbation (MFP) technique is a linear stability analysis that can be used to understand the receptivity of base flows to small perturbations. Its advantage over other linear stability analyses is that it can be applied fairly easily to complex 3-D flows in a relatively efficient manner, embedded within traditional flow-solver frameworks. This technique can help in gaining a better understanding of the receptivity of a flow control actuator that is used to control a complex 3-D flow. The current study seeks to apply the MFP technique to the author’s previous work on unsteady tip vortices. The aspect-ratio-four, rounded-tip wing has a NACA0012 section and operates at a Reynolds number of Re = 2 × 105 and incidence of α = 12°. The objective is to uncover the least stable mode shapes and frequencies of the structure using MFP in hopes of informing future flow control design techniques. At these conditions, the MFP shows a dominant least stable frequency and mode shape that occurs near the trailing edge of the wingtip. A region near the incipient separation of the vortex also showed with a definitive spatial wavelength that may be susceptible to tailored control.","PeriodicalId":346736,"journal":{"name":"Volume 2: Computational Fluid Dynamics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123484104","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

Shape Optimization of a Trumpet-Tipped LVAD Inflow Cannula to Reduce Blood Damage Using a Genetic Algorithm 利用遗传算法优化小号尖头左心室辅助装置流入管形状以减少血液损伤

Volume 2: Computational Fluid Dynamics Pub Date : 2019-07-28 DOI: 10.1115/ajkfluids2019-4690

C. J. Nassau, R. Agarwal

{"title":"Shape Optimization of a Trumpet-Tipped LVAD Inflow Cannula to Reduce Blood Damage Using a Genetic Algorithm","authors":"C. J. Nassau, R. Agarwal","doi":"10.1115/ajkfluids2019-4690","DOIUrl":"https://doi.org/10.1115/ajkfluids2019-4690","url":null,"abstract":"\u0000 Use of computational fluid dynamics (CFD) in the field of blood-contacting medical device design and analysis has been growing in recent years. For example, the U.S. Food and Drug Administration (FDA) Center of Devices and Radiological Health (CDRH) has accelerated interest in industry and academia with nozzle and blood pump benchmarks to uncover best practices and to hopefully elevate the status of CFD to be applied as a safety analysis tool for medical devices. One area, not discussed as often as the pure simulation is the design optimization of hemodynamic devices. A systematic shape “optimization” should be distinguished from a simple “design improvement” by performing many flow field computations and design iterations to improve performance. In this paper, the shape optimization of a trumpet-tipped inflow cannula is presented using a single-objective genetic algorithm (GA) to minimize the blood damage. Many varying accounts in the literature have pointed to the advantages of the trumpet-tipped left ventricular assist device (LVAD) cannula for low blood damage and uniform velocity distribution with little to no backflow when compared to other shapes such as blunt, beveled and caged cannulas.","PeriodicalId":346736,"journal":{"name":"Volume 2: Computational Fluid Dynamics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123893298","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

Design and Development of a Small Multistage Flash Desalination System Using Aspen HYSYS 基于HYSYS的小型多级闪蒸脱盐系统的设计与开发

Volume 2: Computational Fluid Dynamics Pub Date : 2019-07-28 DOI: 10.1115/ajkfluids2019-4975

M. D. Islam, F. Banat, A. Baba, S. Abuyahya

{"title":"Design and Development of a Small Multistage Flash Desalination System Using Aspen HYSYS","authors":"M. D. Islam, F. Banat, A. Baba, S. Abuyahya","doi":"10.1115/ajkfluids2019-4975","DOIUrl":"https://doi.org/10.1115/ajkfluids2019-4975","url":null,"abstract":"\u0000 Fresh water demands are increasing day by day because of growing population, industrialization, and increased living standards. Desalination technology has become a significant solution of fresh drinking water for many parts of the world. Lack of fresh water resources in dry environments has encouraged the establishment of desalination processes and developed technology to compensate for water scarcity. The MSF (multistage flash) desalination technique has received wide spread acceptance due to low temperature heat source (waste heat/inexpensive energy), simple construction high process reliability and simple maintenance. MSF typically has the highest water production cost among available desalination technologies, which can be reduced with using solar energy/co-generation. Since Abu Dhabi is in the solar belt region and is blessed with huge solar energy, MSF desalination can be powered by solar power in addition to industrial waste/fossil fuel energy, which will significantly reduce the cost as well as carbon, footprint. In this research, multistage flash desalination is modelled using ASPEN HYSYS package V8. We have designed each components of the system, mostly heating source, vacuum/flash chambers, heat exchangers and developed the whole system. Some parametric study, i.e. feed rate, top brine temperature, heat input, pressure, productivity etc. of multistage flash desalination system has been conducted in this research. Two case studies have been conducted and found a relation between feed flow rate and water production rate as well as chamber pressure with vapor formation. This design will help to build the pilot plant, do experimental test and validate the model.","PeriodicalId":346736,"journal":{"name":"Volume 2: Computational Fluid Dynamics","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130013030","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

Assessment of Compressible RANS and LES Methods for Organic Vapor Flows Past a NACA4412 Airfoil 可压缩的RANS和LES方法的有机蒸汽流过NACA4412翼型的评估

Volume 2: Computational Fluid Dynamics Pub Date : 2019-07-28 DOI: 10.1115/ajkfluids2019-4843

K. Hasselmann, S. Wiesche, E. Kenig

{"title":"Assessment of Compressible RANS and LES Methods for Organic Vapor Flows Past a NACA4412 Airfoil","authors":"K. Hasselmann, S. Wiesche, E. Kenig","doi":"10.1115/ajkfluids2019-4843","DOIUrl":"https://doi.org/10.1115/ajkfluids2019-4843","url":null,"abstract":"\u0000 In this contribution, an assessment of compressible Reynolds Averaged Navier Stokes equations (RANS) and Large Eddy Simulation (LES) is presented using transonic organic vapor flow past a NACA4412 airfoil as a case study. The NACA4412 represents a canonical geometry, which, in case of air, has been well investigated numerically and experimentally. The results of the real gas simulations are compared with those of air simulations. For the real gas, the organic vapor Novec 649® is chosen as a representative fluid. The thermodynamic behavior of Novec 649® is modeled with the Peng-Robinson equation of state. Different inlet Mach numbers are applied, namely, a sub-critical, the critical, and a super-critical Mach number. It turns out, that the critical Mach number of the NACA4412 airfoil increases when Novec 649® is used as working fluid. Furthermore, it is shown that real gas flow simulations cause additional difficulties for the computational fluid dynamics (CFD) analysis. Although the speed of sound of Novec 649® is lower than the speed of sound of air, a finer grid resolution is required for the real gas simulations due to its high density. Based on an extensive simulation study, an assessment of different numerical modelling strategies and methods is given.","PeriodicalId":346736,"journal":{"name":"Volume 2: Computational Fluid Dynamics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129579945","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

Numerical Simulation of Supercritical Octane Flows in a Heated Circular Tube With Simple Thermal Cracking Model 用简单热裂模型模拟加热圆管内超临界辛烷值流动

Volume 2: Computational Fluid Dynamics Pub Date : 2019-07-28 DOI: 10.1115/ajkfluids2019-4797

Takashi Furusawa, Noriyuki Taki, Shuto Yatsuyanagi, S. Yamamoto, Takuto Miyaura, S. Tomioka

{"title":"Numerical Simulation of Supercritical Octane Flows in a Heated Circular Tube With Simple Thermal Cracking Model","authors":"Takashi Furusawa, Noriyuki Taki, Shuto Yatsuyanagi, S. Yamamoto, Takuto Miyaura, S. Tomioka","doi":"10.1115/ajkfluids2019-4797","DOIUrl":"https://doi.org/10.1115/ajkfluids2019-4797","url":null,"abstract":"\u0000 Supercritical octane flows that undergo thermal cracking in a heated circular tube were numerically investigated using our numerical methods based on the preconditioning method solving the compressible Navier–Stokes equations with the thermophyical properties from the Reference Fluid Thermodynamic and Transport Properties Database (REFPROP). The simple thermal-cracking model for octane was developed from the results calculated by KUCRS and Cantera software, assuming mild cracking condition and single-fluid flow. Supercritical octane flows were simulated under wall temperatures that would and would not encourage thermal cracking. Slight temperature differences affected the velocity distribution in the heated pipe because of the change in density. In low-wall-temperature conditions without thermal cracking, the simulated outlet temperatures were in good agreement with experimental results. Octane near the heated wall was decomposed by thermal cracking in the high wall temperature conditions. The wall temperature and the residual time affected the conversion rate of the thermal-cracking conversion rate. The present numerical methods underestimated the experimentally measured conversion rate, though the rough trends of the conversion rates were captured.","PeriodicalId":346736,"journal":{"name":"Volume 2: Computational Fluid Dynamics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128395339","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

A Computational Heat Transfer and Optimization Study of Drying of Peas and Rice in a Rotary Dryer 豌豆和水稻在旋转干燥机中干燥的传热计算及优化研究

Volume 2: Computational Fluid Dynamics Pub Date : 2019-07-28 DOI: 10.1115/ajkfluids2019-4949

A. Singh, P. Ghoshdastidar

{"title":"A Computational Heat Transfer and Optimization Study of Drying of Peas and Rice in a Rotary Dryer","authors":"A. Singh, P. Ghoshdastidar","doi":"10.1115/ajkfluids2019-4949","DOIUrl":"https://doi.org/10.1115/ajkfluids2019-4949","url":null,"abstract":"\u0000 The paper reports a numerical simulation study of drying of peas and rice grains in a rotary dryer with superheated steam, dry air, and humid air (20%, 40%, 60% and 80% moisture content by volume) at 1 bar as the drying media. The initial water contents in peas and rice grains are 75% and 13% (by weight), respectively. The thermal model includes turbulent convection heat transfer from the gas to the refractory wall and solids, radiation exchange among the gas, refractory wall and the solid surface, conduction in the refractory wall, and mass and energy balances of the gas and the solids. In the absence of experimental data of food drying, the present model has been satisfactorily validated with the experimental and numerical results reported in Sass (1967, Sass, A., “Simulation of Heat-Transfer Phenomena in a Rotary Kiln”, Industrial & Engineering Chemistry Process Design and Development, 6(4), pp. 532–535) for iron ore and cement. It is found that for superheated steam there is an optimum kiln inner diameter at which the predicted kiln length is the highest. For dry air, the predicted kiln length monotonically decreases with a decrease in kiln inner diameter. A detailed parametric study lent a good physical insight into the drying process. An optimization study has been conducted for superheated steam as the drying medium using the Univariate Search method to minimize the length of the kiln with an upper limit on the inlet gas temperature as the constraint.","PeriodicalId":346736,"journal":{"name":"Volume 2: Computational Fluid Dynamics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131667410","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

A Dynamic Time Filtering Technique for Hybrid RANS-LES Simulation of Non-Stationary Turbulent Flow 一种用于非平稳湍流混合ranss - les模拟的动态时间滤波技术

Volume 2: Computational Fluid Dynamics Pub Date : 2019-07-28 DOI: 10.1115/ajkfluids2019-4696

Tausif Jamal, D. Keith Walters

{"title":"A Dynamic Time Filtering Technique for Hybrid RANS-LES Simulation of Non-Stationary Turbulent Flow","authors":"Tausif Jamal, D. Keith Walters","doi":"10.1115/ajkfluids2019-4696","DOIUrl":"https://doi.org/10.1115/ajkfluids2019-4696","url":null,"abstract":"\u0000 Unsteady turbulent wall bounded flows can produce complex flow physics including temporally varying mean pressure gradients, intermittent regions of high turbulence intensity, and interaction of different scales of motion. As a representative example, pulsating channel flow presents significant challenges for newly developed and existing turbulence models in computational fluid dynamics (CFD) simulations. The present study investigates the performance of the Dynamic Hybrid RANS-LES (DHRL) model with a newly proposed dynamic time filtering (DTF) technique, compared against an industry standard Reynolds-Averaged Navier-Stokes (RANS) model, Monotonically Integrated Large Eddy Simulation (MILES), and two conventional Hybrid RANS-LES (HRL) models. Model performance is evaluated based on comparison to previously documented Large Eddy Simulation (LES) results. Simulations are performed for a fully developed flow in a channel with time-periodic driving pressure gradient. Results highlight the relative merits of each model type and indicate that the use of a dynamic time filtering technique improves the accuracy of the DHRL model when compared to a static time filtering technique. A comprehensive evaluation of the results suggests that the DHRL-DTF method provides the most consistently accurate reproduction of the time-dependent mean flow characteristics for all models investigated.","PeriodicalId":346736,"journal":{"name":"Volume 2: Computational Fluid Dynamics","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130307416","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: 1

Computational Study of the Downpull Force on High-Head Slide Gates 高水头滑动闸门下拉力的计算研究

Volume 2: Computational Fluid Dynamics Pub Date : 2019-07-28 DOI: 10.1115/ajkfluids2019-4881

Juan C. Arango Escobar, David Calderon Villegas, A. Moran, Alejandro Molina Ochoa

引用次数: 0