This thesis describes the modification of six computer programs on the Micro VAX/2000/CAD/CAE workstation. Three of the programs, NEW_DOUBLE, NEW_PANEL, and NEW_ VOR, were originally transferred to the Aeronautical Engineering VAX System Server by LCDR John Campbell. Two of the programs (SUB and SUPER), both vortex lattice method programs, were placed in the VAX system by Mr. Rich Margason of the Langley Research Center. None of the above five programs had any graphics facility. The sixth...
Topics: Numerical methods, FORTRAN programs, Viscous effects, Computational fluid dynamics (CFD), Doublet,...
Unstructured grid adaptation is a powerful tool to control discretization error for Computational Fluid Dynamics (CFD). It has enabled key increases in the accuracy, automation, and capacity of some fluid simulation applications. Slotnick et al. provides a number of case studies in the CFD Vision 2030 Study: A Path to Revolutionary Computational Aerosciences to illustrate the current state of CFD capability and capacity. The authors forecast the potential impact of emerging High Performance...
Topics: 1e229fe5b7284965a153b0f761643383, Alonso, Juan J., Boeing Co., Institut National de Recherche...
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27
Nov 4, 2020
11/20
Nov 4, 2020
by
Kazi Mostafijur Rahman*, Zobair Ahmed
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The performance of diesel engine highly depends on atomization, vaporization and mixing of fuel with air. These factors are strongly influenced by various parameters e.g. injection pressure, injection timing, compression ratio, equivalence ratio, cylinder geometry, in cylinder air motion etc. In this study, a diesel engine has been investigated by employing a commercial CFD software (ANSYS Forte, version 18.1) especially developed for internal combustion engines (ICE) modeling; focusing...
Topics: Computational Fluid Dynamics (CFD), Diesel engine, Compression ratio, Combustion performance,...
This thesis is part of a larger project that will demonstrate the feasibility of powering a commercially sized 7.5-ton cooling system. Excess cooling will be stored thermally using ice. This system has the potential to be used in military bases to reduce energy costs and fossil fuel consumption. A scaled down version would be suitable for data centers and forward operating bases where the transport of fuel can be costly and dangerous. The system will be built and operated at the Turbopropulsion...
Topics: Commercial cooling system, vertical axis wind turbines, horizontal axis wind turbines,...
The cross-flow fan (CFF) is a lifting and propulsion device that retains the advantages of a fixed-wing aircraft by using a ducted lift fan. There is no upper limit to the rotor length-to-diameter ratio of a CFF, allowing the device to be installed along the length of the wing or lifting device. The CFF discharged vector can be easily rotated about the fan axis since the fan has no angular requirements, further allowing the capability of vertical take-off and landing (VTOL) by thrust vectoring....
Topics: cross-flow fan (CFF), vertical take-off and landing (VTOL), straight blades, computational fluid...
Air preheater is one of the accessories of steam generators, that works as a heat exchanger that utilizes the heat of the flue gas of the boiler, heating the air needed for the combustion of the fuel, thereby increasing the thermal efficiency of the boiler. It makes a considerable contribution to improve the overall efficiency of fossil-fuel-fired power plants. The paper presents the design of a Recuperative Tubular type, air-through-air Preheater with the staggered tube arrangement, designed...
Topics: Air Preheater, Outlet Temperature of Air, Logarithmic Mean Temperature Difference LMTD, Nusselt...
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33
Jun 23, 2018
06/18
Jun 23, 2018
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Iaset journals
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An impeller design for a respirator is addressed in several textbooks and research articles. According to practiced methods, the overall dimensions and properties of an impeller can be determined using computational fluid dynamics (CFD) and thermodynamic relations. Designing impeller for a respirator is important for fluid flow analysis. The impeller meridional profile is an important detail as a significant influence on the performance. Four, Six blade impellers are commonly used in the...
Topics: Computational Fluid Dynamics (CFD), 4 Blade Impeller, 6 Blade Impeller, 20 Blade Impeller,...
Fluidization velocity is one of the significant parameter to characterize the hydrodynamic studies of fluidized bed as it determines different flow regimes. Computational Fluid Dynamics simulations are carried for a cylindrical bubbling fluidized bed with a static bed height of 1m with 0.150m diameter of gasification chamber. The parameter investigated is fluidization velocity in range of 0.05m/s to 0.7m/s. Sand with density 2600kg/m3 and with a constant particle diameter of sand 385μm is...
Topics: Computational Fluid Dynamics (CFD), Bubbling Character, Air Velocity & Volume Fraction
Indoor air environment of residential building depends on the circulation of air inside the building and exhaust system. It is necessary to have uniform flow of air inside the building at working plane. Buildings are design with natural ventilation strategy to reduce the energy consumption of building. Natural ventilation depends on inside and outside building parameters like, outside wind speed, obstruction in room, shape of building, inlet and out let windows location size, orientation,...
Topics: Window Size, Ventilation, Computational Fluid Dynamics (CFD), Air Circulation & Simulation
The external layer in a building has a paramount role under the building’s energy behaviour point of view. The ventilated façade is a passive system installed on buildings to improve the global energy behaviour. The ventilated façade performance is described. Ventilated façade is mainly based on convection and radiation. This contribution focuses on the convective effect due to buoyancy driven respect to wind forces in the ventilated gap and their influence on the building thermal...
Topics: Convection, Natural Ventilation (NV), Ventilated Façade (VF), Computational Fluid Dynamics (CFD)
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90
Aug 20, 2016
08/16
Aug 20, 2016
by
IASET JOURNALS
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The main objective of this present investigation is to design and analyse pump impeller to give better performance than the existing once. Designing impellers are important for fluid flow analysis for a pump. The impeller of an existing industrial pump was analysed and redesigned using an integrated, design/analysis, turbo machinery geometry modelling and flow simulation system. The purpose of the redesign was to achieve improved impeller performance. To improve the efficiency of pump,...
Topics: Computational Fluid Dynamics (CFD) Analysis, Impeller Design, Pump
More and more floods occurred over the last decade in the world, causing important damages and significant costs. Levee systems have been built to protect low-lying areas against high-floods in numerous rivers in the world over the long human history. However, when levees are not well designed, they hardly resist to major floods and can break easily. These failures increase flood consequences. Optimal design of a levee system for flood protection involves a set of objectives and constraints...
Topics: Urban Flood Propagation, Optimal Flood Levee Designs, 3D Modeling, Computational Fluid Dynamics...
The main objective is to analyze a rocket engine nozzle to understand the phenomena of various design conditions under different convergent angle, divergent angle and throat radius by Computational Fluid Dynamic (CFD). There have also mentioned about inlet boundary conditions with specification according to the experimental information. The paper also addresses static pressure optimization and Mach number optimization. The values on the basis of results along by optimal values of nozzle design...
Topics: Computational Fluid Dynamics (CFD), Mach number, Divergent Angle, Convergent Angle and Static...
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126
Apr 2, 2015
04/15
Apr 2, 2015
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Innovative Research Publications
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Cleaner blowers play an important role in the proper functioning of fluffs collection system for industries. In this paper an industrial blower with three different volute geometries is investigated by using Computational Fluid Dynamics (CFD). And then two new volute geometries are modeled and analyzed based on the air flow through the blower. The numerical investigation revealed that the blowers with modified volute geometries have better outlet velocities. For this work, volute is modeled...
Topics: Centrifugal fan, Volute geometries, Computational Fluid Dynamics (CFD), Experimental methods
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252
Dec 8, 2013
12/13
Dec 8, 2013
by
S. C. Chaudhari, C. O. Yadav & A. B. Damor
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The present paper describes an improve the head of mixed flow pump impeller, Computational Fluid Dynamics (CFD) analysis is one of the advanced CAE tools used in the pump industry. From the results of CFD analysis, the velocity and pressure in the outlet of the impeller is predicted. The optimum inlet and outlet vane angles are calculated for the existing impeller by using the empirical relations. The CAD models of the mixed flow impeller with optimum inlet and outlet angles are modelled...
Topics: Mixed Flow Pump, Computational Fluid Dynamics (CFD) Analysis, Impeller Design, Submersible Pump
