There are always differences between theoretical and experimental results in the study of lifting surfaces. Bounding box control volume measurements infrequently yield exact conservation of mass or consistent values for lift and drag coefficients. Numerically calculated wakes often differ from experimental data. Quite often, an empirical correction can be applied to fit theory to experiment to account for these differences. However, as the demands for state of the art foil design increase,...

Topic: COMPUTATIONAL FLUID DYNAMICS

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Mar 12, 2022
03/22

by
Chung, T. J., 1929-

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xxiii, 1012 p. : 26 cm

Topic: Computational fluid dynamics

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12

Apr 17, 2021
04/21

by
European Computational Fluid Dynamics Conference (4th : 1998 : Athens, Greece)

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2 v. in 3 : 26 cm

Topic: Computational fluid dynamics -- Congresses

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5.0

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xix, 634 p. : 25 cm

Topic: Computational fluid dynamics -- Congresses

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Apr 18, 2021
04/21

by
European Computational Fluid Dynamics Conference (4th : 1998 : Athens, Greece)

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2 v. in 3 : 26 cm

Topic: Computational fluid dynamics -- Congresses

This study used the Computational Fluid Dynamics code, ANSYS-CFX to predict the static aerodynamic characteristics of a canard-wing missile configuration with a hemispherical nose, triangular wedge canards and fixed trapezoidal wings. The study was conducted for Mach numbers of 0.2, 0.8 and 1.2. The results were compared against experimental data from actual wind tunnel tests and data from a semi-empirical method, AP09. The ANSYS-CFX results showed good agreement for CN, CM, and CL but less...

Topics: Computational fluid dynamics., ANSYS, CFX, canard, Computational Fluid Dynamics, missile, AP09

As part of an initial baseline survey of the inlet flow-field into a transonic compressor rotor, a five-hole probe was calibrated and used to determine the Mach number and inlet pitch angle distributions. The data for Mach number were compared to data obtained with a three-hole probe. A numerical investigation of the flow in the inlet ducting to the rotor was also initiated using the commercial code CFX marketed by ANSYS. Comparisons were also made between the numerical predictions and the...

Topics: Mechanical engineering, Computational fluid dynamics

The concept of a fan-wing aircraft configuration for the purpose of vertical takeoff and landing has drawn much attention. Recently, more investigations revealed that a cross-flow fan (CFF) was capable of providing the propulsion. Several characteristics of the off-design performance of a CFF were experimentally measured, but insufficient numerical predictions were obtained. In the present study, the commercial CFD software ANSYS CFX was employed to calculate the unsteady flow through a CFF...

Topics: Computational fluid dynamics, Mechanical engineering

ry at simulated flight conditions, including supersonic cruising conditions. The spiral lines initiator demonstrated a lower total pressure loss with compared to the geometry with rings, and thus was the preferred initiator configuraiton. Experimental values for the turbulence were found to be significantly lower than the computed values at similar conditions when using the k-e model. Finally, successful ignitions of the JP-10/Air initiator at frequencies of up to 20 Hz were experimentally...

Topics: Computational fluid dynamics, Mechanical engineering

As the United States Navy prepares to field a single engine jet, the F-35C Joint Strike Fighter, it is important that the causes of the .pop-stall. occurrence be understood. This problem arises as the jet engine ingests steam just prior to being released from the catapult. In examining this problem two Computational Fluid Dynamic (CFD) codes have been used by the Naval Postgraduate School to predict the performance of a transonic compressor rotor that is being tested with steam ingestion. Both...

Topics: Mechanical engineering, Computational fluid dynamics

Thesis advisors, Oscar Biblarz, Garth Hobson

Topics: AERODYNAMIC CONFIGURATIONS, COMPUTATIONAL FLUID DYNAMICS

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114

Oct 8, 2015
10/15

by
Pomerantz, Boaz

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Thesis advisors, Oscar Biblarz, Garth Hobson

Topic: AERODYNAMIC CONFIGURATIONS,COMPUTATIONAL FLUID DYNAMICS

In this thesis results of a computational and experimental investigation of the aerodynamic characteristics of a sail section used in windsurfing sails are presented. State-of-the-art computational methods (panel, direct boundary layer, viscous-inviscid interaction, Euler, and steady/unsteady Navier-Stokes) were used to predict the aerodynamic loading and stall characteristics. These predictions were found to be in satisfactory agreement with tuft and smoke flow visualization experiments...

Topics: Aerodynamics, Computational fluid dynamics, Sailing

The propagation of fire generated smoke and heat transfer into a shipboard space has been computationally modeled using a commercial code generated by Computational Fluid Dynamics Research Corporation (CFDRC). The space modeled was 1-158-1-L of an Arleigh Burke Class Flight IIA Destroyer. Three smoke and heat scenarios are applied to the space. For all three scenarios, the inlet used is the forward, inboard watertight door. Smoke enters the upper half of the door, while air enters through the...

Topics: Convection, Smoke Modeling, Computational Fluid Dynamics

The propagation of fire generated smoke into a shipboard space with a geometric interference has been modeled using commercial software from the Computational Fluid Dynamics Research Corporation (CFDRC). This study was based on the dimensions of compartment 01-163-2-L and the installed ladder aboard an Arleigh Burke Class Flight IIIA Destroyer. A test model was run which validated the hindrance of fluid flow by a geometric interference. Smoke propagation scenarios were run in the shipboard...

Topics: Convection, Smoke modeling, Computational fluid dynamics

Thesis advisor, Ashok Gopinath

Topics: NUMERICAL ANALYSIS, COMPUTATIONAL FLUID DYNAMICS, REYNOLDS NUMBER

This thesis contains discussion, theory and program code for a computational fluid dynamics (CFD) model of a wing of arbitrary planform. The model assumes incompressible, inviscid, irrotational flow. The program computes forces acting on the wing by modeling the flow with a set of horse shoe vortex elements. It models the flow over an arbitrary wing using two solutions. One solution is the ideal lift, associated with a cambered and twisted wing. The other solution is the additional lift...

Topics: computational fluid dynamics, horse shoe vortex, circulation

This study forms part of a larger study to develop a MEMS scale turbomachinery based vacuum pump. This would allow very high vacuum to be drawn for handheld mass spectroscopy. This thesis concentrates on the roughing portion of the turbo pump where flow can still be treated as a continuum but the no slip boundary condition is not accurate. The first portion of this thesis investigates flow at Knudsen numbers ranging from 0.001 to 0.1. By using a first order analysis, the wall shear stress can...

Topics: MEMS Turbomachinery, Computational Fluid Dynamics, Vacuum Pumps

Pulse detonation combustion offers thermodynamic advantages to the next generation of combustion systems. The thermodynamic efficiency is substantially improved over constant-pressure combustion systems by utilizing detonation-based combustion that occurs typically between 40 and 60 pulses per second. An existing four-inlet combustor was modified to a single-inlet arm design for integration with a rotary-valve concept. This paper discusses the design process of the single-inlet combustor so...

Topics: Mechanical engineering, Combustion chambers, Computational fluid dynamics

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May 24, 2021
05/21

by
Parallel CFD Conference (25th : 2013 : Changsha, Hunan Sheng, China)

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1 online resource

Topics: Computational fluid dynamics -- Congresses, Parallel processing (Electronic computers) --...

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74

Oct 5, 2015
10/15

by
Zeybek, Birol

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Thesis advisor, Ashok Gopinath

Topic: NUMERICAL ANALYSIS,COMPUTATIONAL FLUID DYNAMICS,REYNOLDS NUMBER

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204

Jun 2, 2011
06/11

by
Pendleton, Yvonne J

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The interstellar 4.62-micron band (2165 wavenumber) may be an important contributor to the cyanide (CN) inventory of material available for incorporation into newly forming planetary systems. This band is seen in absorption along lines of sight that pass through icy grains in front of embedded protostars. Therefore, the identification of the inter-stellar band is important for two reasons: for the astrophysical understanding of organic material in the dense cloud environment, and for the...

Topics: COMPUTATIONAL FLUID DYNAMICS, PARALLEL PROCESSING (COMPUTERS), FORTRAN

An extensive review of the literature revealed that many- experimental studies have been conducted in heat-transfer wind tunnels simulating the cooling passages in turbine blades. However, very few numerical studies have been performed. Phoenics, a computational fluid dynamics computer program, produced results for several duct configurations and calculat- ed the heat transfer characteristics of each. The configura- tions investigated included a straight, square duct and a rectangular duct with...

Topics: Turbulator, Computational fluid dynamics, Heat transfer, Grid, Duct

AD-A327 062

Topics: COMPUTATIONAL FLUID DYNAMICS, TWO DIMENSIONAL FLOW, LIFTING SURFACES

Source: half

The paper deals with comparative study of different types of nozzles and selection of best suitable nozzle was done; which can be used for metal chip blowing purpose during machining in CNC machine. Three different type of nozzles, one Convergent type, one Bent Convergent& one Convergent-divergent (C-D) type, were designed and modeled in CATIA V5 software. These nozzles were designed at par with the various commercially available blow off nozzles. Further, Computational Fluid Dynamics (CFD)...

Topics: Nozzle, Computational Fluid Dynamics, Chip Blowing, ANSYS Fluent

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7.0

Jun 14, 2022
06/22

by
Fletcher, C. A. J

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3 v. : 24 cm

Topics: Fluid dynamics -- Mathematics, Computational fluid dynamics, Numerical analysis

Cardiovascular diseases are very common in today’s world. It is of great importance to simulate the behavior of arteries subjected to various anomalies using computational methods, as it will help the clinicians in the early diagnoses of the disease. This paper enumerates the use of computational fluid dynamics (CFD), for simulating blood flow phenomenon in human arteries, especially Abdominal Aortic Aneurysm (AAA). The use of the CFD in simulating the anatomically realistic models is...

Topics: Abdominal Aortic Aneurysm, Computational Fluid Dynamics & Velocity Vectors

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103

Aug 20, 2016
08/16

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

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122

Oct 5, 2015
10/15

by
Dannecker, John D

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AD-A327 062

Topic: COMPUTATIONAL FLUID DYNAMICS,TWO DIMENSIONAL FLOW,LIFTING SURFACES

The heat extraction problem is becoming an important factor in the development of micro-electronics. Over the last decade, micromachining technology has been increasingly used for the development of highly efficient cooling devices called heat sink because of its undeniable advantages such as less coolant demands and small dimensions. One of the most important micromachining technologies is micro channels. Hence, the study of fluid flow and heat transfer in micro channels which are two...

Topics: Heat extraction, micromachining, stacked microchannel, computational fluid dynamics

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241

Jun 12, 2011
06/11

by
Park, Sang-Young; Mazanek, Daniel D

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Using astrometric interferometry on near-Earth objects (NEOs) poses many interesting and difficult challenges. Poor reflectance properties and potentially no significant active emissions lead to NEOs having intrinsically low visual magnitudes. Using worst case estimates for signal reflection properties leads to NEOs having visual magnitudes of 27 and higher. Today the most sensitive interferometers in operation have limiting magnitudes of 20 or less. The main reason for this limit is due to the...

Topics: STIRLING CYCLE, CONVERTERS, FABRICATION, REGENERATORS, COMPUTATIONAL FLUID DYNAMICS

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Jun 2, 2011
06/11

by
Loomis, Mark; Palmer, Gran

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Ames Research Center has been developing new ultrahigh temperature ceramics (UHTC) for potential use in the sharp leading edges of future space vehicles. These materials have been developed and tested in ground-based arc-jet facilities, and a flight test program called SHARP (slender hypervelocity research aerothermodynamic research probes) has been initiated. The first flight demonstration, SHARP-61, incorporated a 0.141 -inch-radius UHTC nose-tip on a U.S. Air Force reentry vehicle in...

Topics: TIME DEPENDENCE, UNSTEADY FLOW, FLOW VISUALIZATION, COMPUTATIONAL FLUID DYNAMICS

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10.0

May 17, 2022
05/22

by
Pozrikidis, C. (Constantine), 1958-

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xvii, 773 pages : 24 cm

Topics: Fluid dynamics, Computational fluid dynamics, Fluid dynamics -- Mathematical models

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281

May 30, 2011
05/11

by
Sherry, Lance; Feary, Michael; Polson, Peter; Mumaw, Randall; Palmer, Everet

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A cognitive engineering analysis of the Flight Management System (FMS) Vertical Navigation (VNAV) function has identified overloading of the VNAV button and overloading of the Flight Mode Annunciator (FMA) used by the VNAV function. These two types of overloading, resulting in modal input devices and ambiguous feedback, are well known sources of operator confusion, and explain, in part, the operational issues experienced by airline pilots using VNAV in descent and approach. A proposal to modify...

Topics: COMPUTATIONAL FLUID DYNAMICS, NOISE PREDICTION, STEADY STATE, SEMIEMPIRICAL EQUATIONS

A full three dimensional computational study was carried out using a finite-volume based solver for analyzing the performance of pin-fin based micro/meso scale heat exchangers with air as the working fluid. A staggered arrangement of cylindrical pin fins in rectangular channel geometry was used. Various configurations were considered consistent with a parallel experimental study being conducted based on a micro-wind tunnel setup. The pin/channel height used was 0.4 mm, and the pin diameters...

Topics: Computational fluid dynamics, Laminar flow, Mechanical engineering, Reynolds number

Topics: CFD, Canard, Computational fluid dynamics, Hypersonic aerodynamics, Space shuttle

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May 6, 2010
05/10

by
Underwood, Lauren W.; Goward, Samuel N.; Fearon, Matthew G.; Fletcher, Rose; Garvin, Jim; Hurtt, Georg

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The cover image incorporates high resolution stereo pairs acquired from the DigitalGlobe(R) QuickBird sensor. It shows a digital elevation model of Meteor Crater, Arizona at approximately 1.3 meter point-spacing. Image analysts used the Leica Photogrammetry Suite to produce the DEM. The outside portion was computed from two QuickBird panchromatic scenes acquired October 2006, while an Optech laser scan dataset was used for the crater s interior elevations. The crater s terrain model and image...

Topics: COMPUTATIONAL FLUID DYNAMICS, DEFORMATION, DRAG, ALGORITHMS, SHAPES, SONIC BOOMS

In a continuation of ongoing Naval Postgraduate School efforts to study the performance characteristics of waverider configured vehicles, a computational fluid dynamic (CFD) analysis of the Mach 6 L/DI(sp)(max) optimized Price waverider was conducted. This analysis was performed to determine the theoretical force and moment data over a broad Mach number spectrum, and to compare theoretical and experimental results in the subsonic flight regime. The CFD determination of force and moment data...

Topics: Air vehicles, Hypersonic flight, Computational fluid dynamics, Waverider configurations

In this present work, the cross flow heat exchanger (CFHE) is utilized and computational fluid dynamics (CFD) is used to analyze the performance of evaporator to enhance the thermal efficiency, and to improve the distribution of fluid flow. CFHE has a capacity of providing 1.5 m 3 /min of water at 55 ° C for a Combined Heat & around 200 ° C for the nano fluids. The CFD principles utilized in this effort are effective and suitable techniques that use finite elements to solve the heat...

Topics: Cross Flow Heat Exchanger, Computational Fluid Dynamics & Flow Characteristics

The objective of this work is the investigation of vortical flows at high angles of attack using numerical techniques. The first step for a successful application of a numerical technique, such as fimite difference or finite volume, is the generation of a computational mesh which can capture adequately and accurately the important physics of the flow. Therefore, the first part of this work deals with the grid generation over a double-delta wing and the second part deals with the visualization...

Topics: Computational fluid dynamics., Word processing, script, GML, text processing

Flow around polished second-generation controlled-diffusion blades in cascade set at their design inlet flow angle was investigated at various Reynolds numbers using static pressure measurements, five-hole probe surveys, twocomponent laser Doppler velocimetry (LDV), computational fluid dynamics and flow visualization. A suction-side separation bubble formed at Reynolds number, based on chord length, of 203,000 and collapsed by a Reynolds number of 393,000. Five-hole probe surveys characterized...

Topics: Mechanical engineering, Diffusion, Control, Pressure, Measurement, Computational fluid dynamics

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Mar 31, 2022
03/22

by
NATO Advanced Study Institute on Microscopic Simulations of Complex Hydrodynamic Phenomena (1991 : Alghero, Italy)

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xiii, 438 p. : 26 cm

Topics: Computational fluid dynamics -- Congresses, Molecular dynamics -- Data processing -- Congresses

Usually, most of the AUV has the propeller and it is placed in a suitable position for maneuvering in the required direction. For single propeller AUVs, propeller is placed at the aft, and direction is controlled using wings that are placed aft. Energy is a major part of an underwater operation to decide the duration of underwater operation. To increase the duration of the battery, either the energy consumption can be reduced or the efficiency of the propulsion system needs to be improved. Here...

Topics: propulsion system, energy saving device, rudder, computational fluid dynamics

Validation is the assessment of the accuracy of computational simulations by comparison with experimental data. A well validated computational fluid dynamics model can be of high importance when assessing the safety of medical devices. However, its validation and verification must be conducted before the results can be considered credible. The U.S. Food and Drug Administration has completed a computational inter-laboratory study that showed relatively negative current state of numerical methods...

Topics: Computational Fluid Dynamics, Medical Device, Fluid Flow, Validation, Simulation

http://uf.catalog.fcla.edu/uf.jsp?st=UF001128593&ix=nu&I=0&V=D

Topics: Turbulence, Navier-Stokes equations, Aerodynamics, Transonic, Computational fluid dynamics.

This article discusses the development of turbogenerator model intended for energy units of small scale and distributed power generation. Turbogenerator model should be developed on the basis of computational fluid dynamics, which permits to adjust model design and to determine variables of the cooling system which provides required temperature mode during operation of electric machine. Test results of two variants of turbogenerator model are presented which were analyzed from the point of view...

Topics: Turbogenerator, Simulation, Computational Fluid Dynamics, Turbine Wheel & Cooling System

The present work includes a study of the impact of varying pitch angles and angular velocity on the performance parameters of a horizontal axis wind turbine using computational fluid dynamics. Simulations have been made using commercial Ansys 15 software. Seven pitch angles are chosen for study, i.e., 0 ° , 5 ° , 10 ° , 15 ° , 20 ° , 25 ° , and 28 °, and two angular velocity values of 1.57 rad/sec and 2.22 rad/sec are used for simulation. The turbulence model used is shear stress...

Topics: Computational fluid dynamics pitch angle, Wind power, Wind turbine blade

This study explores the numerical optimization of water turbine runner profile performance using a surface vorticity model algorithm. The turbine is designed on a laboratory scale and operates at a net head of 0.09 m, 400 rpm, and a water flow rate of 0.003 m3/s. The initial design of the turbine runner was optimized to minimize losses in the hydrofoil. The optimization algorithm is coded in MATLAB software to obtain the optimal stagger angle that will be used in the water turbine design....

Topics: Hydroelectric power, Potential flow analysis Computational fluid dynamics, Renewable energy

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181

Jun 3, 2011
06/11

by
Pang, Wan-Lin; Golden, Keit

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In this paper we report our work on a new constraint domain, where variables can take structured values. Earth-science data processing (ESDP) is a planning domain that requires the ability to represent and reason about complex constraints over structured data, such as satellite images. This paper reports on a constraint-based planner for ESDP and similar domains. We discuss our approach for translating a planning problem into a constraint satisfaction problem (CSP) and for representing and...

Topics: COMPUTATIONAL FLUID DYNAMICS, CONTROL STABILITY, SYSTEMS INTEGRATION, AIRCRAFT CONTROL, COMPUTATION

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544

Jun 2, 2011
06/11

by
Martin, Preston B.; Leishman, J. Gordo

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This work examined the wake aerodynamics of a single helicopter rotor blade with several tip shapes operating on a hover test stand. Velocity field measurements were conducted using three-component laser Doppler velocimetry (LDV). The objective of these measurements was to document the vortex velocity profiles and then extract the core properties, such as the core radius, peak swirl velocity, and axial velocity. The measured test cases covered a wide range of wake-ages and several tip shapes,...

Topics: COMPUTATIONAL FLUID DYNAMICS, ALGORITHMS, THREE DIMENSIONAL MODELS, AIRFOILS, CARTESIAN COORDINATES