Computational Fluid Dynamics Simulations最新文献

The Multiphase Flow CFD Analysis in Journal Bearings Considering Surface Tension and Oil-Filler Port Flow 考虑表面张力和充油口流动的滑动轴承多相流CFD分析

Computational Fluid Dynamics Simulations Pub Date : 2020-07-21 DOI: 10.5772/intechopen.92421

M. Ochiai, F. Sakai, H. Hashimoto

{"title":"The Multiphase Flow CFD Analysis in Journal Bearings Considering Surface Tension and Oil-Filler Port Flow","authors":"M. Ochiai, F. Sakai, H. Hashimoto","doi":"10.5772/intechopen.92421","DOIUrl":"https://doi.org/10.5772/intechopen.92421","url":null,"abstract":"This chapter presents the multiphase computational fluid dynamics (CFD) analysis on oil-lubricated high-speed journal bearings considering the oil-filler port. Journal bearings are widely used for high-speed rotating machinery such as tur-bines, compressors, pumps, automobiles, and so on. They can support the rotating shaft utilizing the oil lubrication film wedge effects used in the bearing clearance. Previously, in the analysis of journal bearings, which clearance is very narrow compared with shaft diameter, the Reynolds equation has been used on journal bearing analysis because of its applicability on the narrow space calculation and its low calculation cost. However, the gaseous-phase area generated in the journal bearing and the effect of oil-filler port cannot be reproduced accurately using the method. Under these backgrounds, some researchers use the CFD analysis to calculate the journal bearing characteristics in recent years. In this chapter, the authors describe the multiphase flow CFD analysis on journal bearing based on our previous studies . At first, the multiphase CFD calculation model on journal bearing and the experimental method are explained. Then, four types of calculation results under flooded and starved lubrication conditions are compared to the experimental ones. Additionally, the effect of surface tension on journal bearing characteristics is discussed. Finally, the CFD thermal analysis results under two types of supply oil conditions are shown.","PeriodicalId":283514,"journal":{"name":"Computational Fluid Dynamics Simulations","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133145297","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

Scaling Investigation of Low Prandtl Number Flow and Double Diffusive Heat and Mass Transfer over Inclined Walls 斜壁上低普朗特数流动和双扩散传热传质的标度研究

Computational Fluid Dynamics Simulations Pub Date : 2020-05-11 DOI: 10.5772/INTECHOPEN.90896

Mubashir O. Quadri, Matthew N. Ottah, O. Adewumi, A. Oyediran

引用次数: 0

Development of the Flight Dynamic Model (FDM) Using Computational Fluid Dynamic (CFD) Simulations for an Unknown Aircraft 基于计算流体动力学(CFD)模拟的未知飞机飞行动力学模型(FDM)的开发

Computational Fluid Dynamics Simulations Pub Date : 2020-05-05 DOI: 10.5772/intechopen.91895

A. Loya, S. Arif, M. Arsalan, Siraj Anis, Arsalan Khan, Muhammad Saad Saeed, Abdul Hameed Siddiqui

引用次数: 1

Calibration Methodology for CFD Models of Rooms and Buildings with Mechanical Ventilation from Experimental Results 基于实验结果的机械通风房间和建筑物CFD模型标定方法

Computational Fluid Dynamics Simulations Pub Date : 2020-03-25 DOI: 10.5772/intechopen.89848

A. Casado, Magdalena Hajdukiewicz, F. S. D. L. Flor, Enrique Ángel Rodríguez Jara

{"title":"Calibration Methodology for CFD Models of Rooms and Buildings with Mechanical Ventilation from Experimental Results","authors":"A. Casado, Magdalena Hajdukiewicz, F. S. D. L. Flor, Enrique Ángel Rodríguez Jara","doi":"10.5772/intechopen.89848","DOIUrl":"https://doi.org/10.5772/intechopen.89848","url":null,"abstract":"This chapter describes a methodology for the development and calibration of computational fluid dynamics (CFD) models of three-dimensional enclosures for buildings with combined forced and natural convection from experimental result. The models were validated with physical test measurements of room air temperature. The developed CFD models included a model of an internal wall-mounted air conditioning (HVAC) split unit. The methodology proposed here aims at selecting the correct grid size and the appropriate boundary conditions from experimental data. The experimental campaign took place in an empty office room within an educational building. A set of experiments was performed with varying boundary conditions of two main variables, the fan speed of the HVAC unit and the surface wall temperature of the opposite wall to the HVAC unit. The developed CFD models used the standard k- ε turbulence model and the SIMPLE algorithm. The variable of interest was the room air temperature and its distribution within the internal environment. The application of the methodology has shown satisfactory results, finding a maximum error of 9% between the CFD model and the experimental result. This methodology can be used by other researchers to calibrate CFD models in existing rooms and then carry out detailed studies of temperature distribution, comfort and energy demand analysis.","PeriodicalId":283514,"journal":{"name":"Computational Fluid Dynamics Simulations","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122492096","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: 2

Computational Fluid Dynamics of Mixing Performance in Microchannel 微通道混合性能的计算流体力学

Computational Fluid Dynamics Simulations Pub Date : 2019-12-13 DOI: 10.5772/intechopen.89928

S. Termizi, S. R. Shukor

引用次数: 0

Bingham Fluid Simulation in Porous Media with Lattice Boltzmann Method 基于点阵玻尔兹曼方法的多孔介质Bingham流体模拟

Computational Fluid Dynamics Simulations Pub Date : 2019-11-21 DOI: 10.5772/intechopen.90167

J. Ortega

引用次数: 3

Hydrodynamic Analysis on a Photocatalytic Reactor Using ANSYS Fluent® 基于ANSYS Fluent的光催化反应器流体动力学分析

Computational Fluid Dynamics Simulations Pub Date : 2019-11-06 DOI: 10.5772/INTECHOPEN.89782

Adolfo Ruiz-Soto, D. Barraza-Jiménez, A. Hurtado-Macías, S. Torres-Herrera, Carlos Omar Ríos-Orozco, M. López-Guzmán, Elva Marcela Coria-Quiñones, Raúl Armando Olvera-Corral, M. A. Flores-Hidalgo

{"title":"Hydrodynamic Analysis on a Photocatalytic Reactor Using ANSYS Fluent®","authors":"Adolfo Ruiz-Soto, D. Barraza-Jiménez, A. Hurtado-Macías, S. Torres-Herrera, Carlos Omar Ríos-Orozco, M. López-Guzmán, Elva Marcela Coria-Quiñones, Raúl Armando Olvera-Corral, M. A. Flores-Hidalgo","doi":"10.5772/INTECHOPEN.89782","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.89782","url":null,"abstract":"Solar technology includes a wide variety of developments in environmental applications that include photovoltaic cells and photocatalytic devices, among others. Sunlight usage as a clean energy source is highly desirable in technology applications. The main interest of this proposal is to carry on with hydrodynamic analysis in photocatalytic reactors applications where sunlight is used to activate a chemical reaction to degrade water pollutants and calculations are based in computational fluid dynamics (CFD) using ANSYS®. The different steps, geometric domain, preprocessing steps, setup, and postprocessing steps, are described to display an analysis of a numerical calculation during the design of a photocatalytic reactor using the commercial software ANSYS Fluent®. This work may help as a guide for chemical reactor design and includes a numerical solution of one case for a photocatalytic reactor during its design process. In addition, simplifications are explained which enable the designer to make an efficient process of the numerical calculation. Calculations and analysis are carried over in ANSYS Fluent® a powerful multi-physics program suite to develop photocatalytic reactors.","PeriodicalId":283514,"journal":{"name":"Computational Fluid Dynamics Simulations","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114899164","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 Modeling of Nanotechnology-Boosted Chemical Enhanced Oil Recovery Methods 纳米技术促进化学提高采收率方法的数值模拟

Computational Fluid Dynamics Simulations Pub Date : 2019-10-22 DOI: 10.5772/intechopen.89757

P. Druetta

{"title":"Numerical Modeling of Nanotechnology-Boosted Chemical Enhanced Oil Recovery Methods","authors":"P. Druetta","doi":"10.5772/intechopen.89757","DOIUrl":"https://doi.org/10.5772/intechopen.89757","url":null,"abstract":"Since it was theorized more than 50 years ago, nanotechnology has become the perfect boost for existing old technologies. The unique properties exhibited by materials at these scales have a potential to improve the performance of mature oil fields along with enhanced oil recovery (EOR) processes. Regarding polymer flooding, the influence of the (macro) molecules’ architecture on the fluid properties has been lately stressed. This chapter presents the numerical simulation of the combination of both agents in a single, combined recovery process. The presence of the nanoparticles affects the rheological behavior and the rock’s wettability, increasing the organic phase mobility. Undesirable effects such as (nano) particle aggregation and sedimentation are also considered. The polymer’s architecture has a major influence on the recovery process, improving the rheological and viscoelastic properties. On the other hand, although nanoparticles improve the viscosity as well, its main mechanism is their adsorption onto the rock and wettability modification. This chapter shows the importance of a good polymer characterization for EOR, the potential of nanoparticles acting as a boost of traditional EOR processes, and the vital role CFD techniques play to assess the potential of these agents and the optimization of the recovery strategies.","PeriodicalId":283514,"journal":{"name":"Computational Fluid Dynamics Simulations","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133942176","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

CFD Application for Gas Turbine Combustion Simulations CFD在燃气轮机燃烧模拟中的应用

Computational Fluid Dynamics Simulations Pub Date : 2019-10-22 DOI: 10.5772/intechopen.89759

V. Vilag, J. Vilag, R. Carlanescu, A. Mangra, F. Florean

引用次数: 5

Computational Fluid Dynamic Simulation of Vertical Axis Hydrokinetic Turbines 垂直轴水动力涡轮计算流体动力学仿真

Computational Fluid Dynamics Simulations Pub Date : 2019-09-27 DOI: 10.5772/intechopen.89184

Edwin Lenin Chica Arrieta, Ainhoa Rubio Clemente

{"title":"Computational Fluid Dynamic Simulation of Vertical Axis Hydrokinetic Turbines","authors":"Edwin Lenin Chica Arrieta, Ainhoa Rubio Clemente","doi":"10.5772/intechopen.89184","DOIUrl":"https://doi.org/10.5772/intechopen.89184","url":null,"abstract":"Hydrokinetic turbines are one of the technological alternatives to generate and supply electricity for rural communities isolated from the national electrical grid with almost zero emission. These technologies may appear suitable to convert kinetic energy of canal, river, tidal, or ocean water currents into electricity. Nevertheless, they are in an early stage of development; therefore, studying the hydrokinetic system is an active topic of academic research. In order to improve their efficiencies and understand their performance, several works focusing on both experimental and numerical studies have been reported. For the particular case of flow behavior simulation of hydrokinetic turbines with complex geometries, the use of computational fluids dynamics (CFD) nowadays is still suffering from a high computational cost and time; thus, in the first instance, the analysis of the problem is required for defining the computational domain, the mesh characteristics, and the model of turbulence to be used. In this chapter, CFD analysis of a H-Darrieus vertical axis hydrokinetic turbines is carried out for a rated power output of 0.5 kW at a designed water speed of 1.5 m = s, a tip speed ratio of 1.75, a chord length of 0.33 m, a swept area of 0.636 m 2 , 3 blades, and NACA 0025 hydrofoil profile.","PeriodicalId":283514,"journal":{"name":"Computational Fluid Dynamics Simulations","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127964466","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: 2