Bubbly Flows: Analysis, Modelling and Calculation Author: Prof. Dr.-Ing. Martin Sommerfeld Published by Springer Berlin Heidelberg ISBN: 978-3-642-62150-5 DOI: 10.1007/978-3-642-18540-3 Table of Contents: Errata Detailed experimental studies on gas-liquid bubble flow in bubble columns with and without recycle Basic experimental investigations on the hydrodynamics of bubble columns Examinination of bubble collisions and coalescence in bubbly flows PIV-Study on bubble interaction and wakes in...

Topics: Multiphase flow, Bubbles, Bubbles, Multiphase flow

Folkscanomy: A Library of Books

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Dec 30, 2015
12/15

by
Chen, Zhangxin, 1962-; Ewing, Richard E; Shih, Chung-tzʻu; Shi, Zhongci; International Workshop on Fluid Flow and Transport in Porous Media (1999 : Beijing, China)

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Numerical Treatment of Multiphase Flows in Porous Media: Proceedings of the International Workshop Held a Beijing, China, 2–6 August 1999 Author: Zhangxin Chen, Richard E. Ewing, Zhong-Ci Shi Published by Springer Berlin Heidelberg ISBN: 978-3-540-67566-2 DOI: 10.1007/3-540-45467-5 Table of Contents: Mathematical and Numerical Techniques in Energy and Environmental Modeling Domain Decomposition for Some Transmission Problems in Flow in Porous Media Numerical Subgrid Upscaling of Two-Phase...

Topic: Multiphase flow

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viii, 200 p. : 29 cm

Topic: Multiphase flow

Click here to view the University of Florida catalog record

Topics: Multiphase flow, Image processing

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1 v. (various pagings) : 25 cm

Topic: Multiphase flow -- Handbooks, manuals, etc

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Aug 13, 2020
08/20

by
Victor H. Ransom

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Victor H. Ransom. Course A---Numerical modeling of two-phase flows for presentation at Ecole d'Ete d'Analyse Numerique . Technical Report EGG-EAST-8546, EG&G Idaho, 1989. This course is designed to provide an introduction to the application of two-fluid modeling techniques to two-phase or, more generally, multiphase flow, and to the numerical methods that have been developed for solution of such problems.

Topics: Two-phase flow, multiphase flow

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292

May 6, 2010
05/10

by
Edelman, R.; Rosenbaum, H.; Slutsky, S

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Multicomponent multiphase viscous flow with applications to laminar and turbulent jets of hydrogen

Topics: HYDROGEN, MULTIPHASE FLOW, TURBULENT JET, VISCOUS FLOW, JET FLOW, LAMINAR FLOW, MULTIPHASE FLOW,...

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535 pages : 26 cm

Topics: Multiphase flow -- Congresses, Oil fields -- Production methods -- Congresses, Gas fields --...

This report summarizes the main activities and outcomes of the 9th International Conference on Multiphase Flow (ICMF-2016), which was hosted by the University of Udine and held at the Firenze Fiera Conference Center, Firenze (Italy) from May 22 to May 27, 2016.Since 1991, the International Conference on Multiphase Flow (ICMF) is the largest international forum to present and discuss progress in research, development, standards, and applications of the topics related to multiphase flows.

Topics: DTIC Archive, Soldati,Alfredo, University of Udine Udine Italy, Multiphase flow, Lessons learned

The short term purpose of the workshop described by this viewgraph presentation is to present a research plan and a 'roadmap' developed for strategic research for the Office of Biological and Physical Research. The long term purpose of the workshop is to conduct necessary ground-based and space-flight low gravity experiments, complemented by analyses, resulting in a documented framework for parameter prediction of needed by designers. The presentation reviews several previous workshops which...

Topics: NASA Technical Reports Server (NTRS), FLUID DYNAMICS, MICROGRAVITY, MULTIPHASE FLOW, PRIORITIES,...

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Jun 2, 2011
06/11

by
Wan, Zheng-Min

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This report summarizes the accomplishments made by the MODIS LST (Land-Surface Temperature) group at University of California, Santa Barbara, under NASA Contract. Version 1 of the MODIS Land-Surface Temperature Algorithm Theoretical Basis Document (ATBD) was reviewed in June 1994, version 2 reviewed in November 1994, version 3.1 in August 1996, and version 3.3 updated in April 1999. Based on the ATBD, two LST algorithms were developed, one is the generalized split-window algorithm and another...

Topics: GRANULAR MATERIALS, FLUID MECHANICS, INTERSTITIALS, VISCOUS FLOW, RHEOLOGY, MULTIPHASE FLOW, MARS...

The mathematical singularities in continuum multiphase simulations were demonstrated by investigating a set of canonical problems of drop pinching off. The singularities were identified as arising from continuum Navier-Stokes formulation, indicating a physics-based closure model required to bypass the singularities. The study of detailed pinch-off physics was enabled by the development of a mesoscale approach based on particle-based formulation that bridges molecular and continuum scales....

Topics: DTIC Archive, UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CT, *MULTIPHASE FLOW, INTERFACES,...

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May 23, 2011
05/11

by
Henson, Robert A.; Keller, John R

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The Life Support Systems Integration Facility (LSSIF) provides a platform to design and evaluate advanced manned space systems at NASA Johnson Space Center (JSC). The LSSIF Early Human Testing Initiative requires the integration of such subsystems to enable human occupancy of the 6 meter chamber for a 90 day closed volume test. The Advanced Thermal Control System (TCS) is an important component of the integrated system by supplying coolant to the subsystems within the chamber, such as the Air...

Topics: CONFERENCES, FLUID DYNAMICS, MICROGRAVITY, SPACEBORNE EXPERIMENTS, GRAVITATIONAL EFFECTS,...

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331

May 31, 2011
05/11

by
Minnetyan, Levo

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Energy release rate is usually suggested as a quantifier for assessing structural damage tolerance. Computational prediction of energy release rate is based on composite mechanics with micro-stress level damage assessment, finite element structural analysis and damage progression tracking modules. This report examines several issues associated with energy release rates in composite structures as follows: Chapter I demonstrates computational simulation of an adhesively bonded composite joint and...

Topics: FLUID DYNAMICS, SPACE MISSIONS, AEROSPACE ENVIRONMENTS, MICROGRAVITY, MULTIPHASE FLOW, RESEARCH AND...

The research investigated the use of a geotechnical centrifuge to model nonaqueous phase liquids (NPALs) flowing through a porous media. Experiments modeled saturated and unsaturated flow through homogeneous and heterogeneous sands, smooth parallel plates, and rough rock fissures. The research validated the use of the centrifuge to model flow processes, however, there are limitations and restrictions on the nature and type of problems which can be investigated.

Topics: DTIC Archive, Chipley, Michael, COLORADO UNIV AT BOULDER, *MODELS, *MULTIPHASE FLOW, SAND,...

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May 23, 2011
05/11

by
Reddy, T. S. R.; Lucero, John M

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This manual describes the input data required for using the second version of the ASTROP2 (Aeroelastic STability and Response Of Propulsion systems - 2 dimensional analysis) computer code. In ASTROP2, version 2.0, the program is divided into two modules: 2DSTRIP, which calculates the structural dynamic information; and 2DASTROP, which calculates the unsteady aerodynamic force coefficients from which the aeroelastic stability can be determined. In the original version of ASTROP2, these two...

Topics: AIR BREATHING ENGINES, OPTIMIZATION, ENGINE DESIGN, ENGINE ANALYZERS, MULTIPHASE FLOW, TURBOFAN...

The commonly used incompressible phase field models for non-reactive, binary fluids, in which the Cahn-Hilliard equation is used for the transport of phase variables, conserve the total volume of each phase as well as the material volume, but do not conserve the mass of the fluid mixture when the densities of two components are different. In this paper, we formulate the phase field theory for mixtures of two incompressible fluids, consistent with the quasi-compressible theory, to ensure the...

Topics: DTIC Archive, SOUTH CAROLINA UNIV COLUMBIA DEPT OF MATHEMATICS, *MULTIPHASE FLOW, FREE ENERGY,...

A review of the application of single particle hydrodynamics in models for the exchange of interphase momentum in continuum models of multiphase flow is presented. Considered are the equations of motion for a laminar, mechanical two phase flow. Inherent to this theory is a model for the interphase exchange of momentum due to drag between the dispersed particulate and continuous fluid phases. In addition, applications of two phase flow theory to de-mixing flows require the modeling of interphase...

Topics: NASA Technical Reports Server (NTRS), HYDRODYNAMICS, LAMINAR FLOW, MULTIPHASE FLOW, DRAG, EQUATIONS...

An expanded and improved version of a previously published benzene oxidation mechanism is presented and shown to model published experimental data fairly successfully. This benzene submodel is coupled to a modified version of a toluene oxidation submodel from the recent literature. This complete mechanism is shown to successfully model published experimental toluene oxidation data for a highly mixed flow reactor and for higher temperature ignition delay times in a shock tube. A comprehensive...

Topics: NASA Technical Reports Server (NTRS), BENZENE, MULTIPHASE FLOW, OXIDATION, TOLUENE, CHEMICAL...

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Jul 19, 2017
07/17

by
R.Rajesh and B.Chandrasekhar

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In the present work, an investigation has been made about the shape change and movement phenomena of liquid droplet over a horizontal solid surface under shear flow with adiabatic boundary condition. Finite Volume Method (FVM) with 3D Volume of Fluid (VOF) model has been used to formulate/simulate the complex interface in multiphase flow. The effect of important factors which govern the drop dynamics on a solid surface (like fluid properties: density, surface tension, viscosity and the surface...

Topics: Multiphase flow, Droplet, Interface, Volume of Fluid (VOF), Finite Volume Method (FVM), Contact...

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252

Sep 20, 2010
09/10

by
Gilland, Ji

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The topics covered are presented in viewgraph form and include the following: Nuclear Propulsion Office Nuclear Electric Propulsion (NEP) goals; near term systems definition, representative near term NEP systems; demonstration missions; primary missions; near term NEP Mars cargo mission; near term NEP Mars mission analysis; and near term NEP mars mission.

Topics: AIRCRAFT DESIGN, CIVIL AVIATION, COMMERCIAL AIRCRAFT, PASSENGER AIRCRAFT, SUPERSONIC TRANSPORTS,...

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Jun 9, 2011
06/11

by
Farassat, F.; Pegg, R. J.; Hilton, D. A

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A new formulation of helicopter rotor thickness, noise for hover and forward flight, is discussed. The parameters required for this formulation are rotor motion, planform and airfoil thickness distribution. A computer program has been developed to calculate the pressure signature due to blade thickness for a helicopter in arbitrary motion. Comparison with high-speed helicopter tests shows good agreement with calculations when the observer is in or near the horizontal plane in which the rotor...

Topics: GAS TURBINE ENGINES, SUPERSONIC DIFFUSERS, ENGINE INLETS, TURBOFANS, SUPERSONIC FLOW, AIR FLOW,...

In this work, we present insight on the internal gaseous flow of artificially ventilated supercavities. Using multiphase computational fluid dynamics, the major mechanism of gas leakage from a ventilated supercavity is identified as occurring though gaseous shear layers forming at the gas-water interface. These observations corroborate previous theory developed for toroidal cavities, and display evidence that shear-layer mechanisms remain important for twin-vortex cavities and cavities...

Topics: DTIC Archive, PENNSYLVANIA STATE UNIV STATE COLLEGE APPLIED RESEARCH LAB, *COMPUTATIONAL FLUID...

The Fifth Annual Thermal and Fluids Analysis Workshop was held at the Ohio Aerospace Institute, Brook Park, Ohio, cosponsored by NASA Lewis Research Center and the Ohio Aerospace Institute, 16-20 Aug. 1993. The workshop consisted of classes, vendor demonstrations, and paper sessions. The classes and vendor demonstrations provided participants with the information on widely used tools for thermal and fluid analysis. The paper sessions provided a forum for the exchange of information and ideas...

Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, CONFERENCES, FLUID MECHANICS, THERMAL...

The conference's purpose was to inform the fluid physics community of research opportunities in reduced-gravity fluid physics, present the status of the existing and planned reduced gravity fluid physics research programs, and inform participants of the upcoming NASA Research Announcement in this area. The plenary sessions provided an overview of the Microgravity Fluid Physics Program information on NASA's ground-based and space-based flight research facilities. An international forum offered...

Topics: NASA Technical Reports Server (NTRS), CONFERENCES, FLUID DYNAMICS, HEAT TRANSFER, MICROGRAVITY,...

This paper presents a numerical model for evaluating fugitive dust emission and transport at near-field induced by a moving vehicle. The dust emission model describes the quantity and location of emitted dust. The transport of the dust is captured by the Lagrangian particle tracking method, and turbulence dispersion of particles is modeled stochastically. The presented model is validated numerically for the prediction of dust concentration in a region near vehicles through a careful comparison...

Topics: DTIC Archive, MISSISSIPPI STATE UNIV MISSISSIPPI STATE CENTER FOR ADVANCED VEHICULAR SYSTEMS,...

The Final Proceedings for EUROMECH Fluid Mechanics Conference (EFMC2000), 19 November 2000 - 23 November 2000 The Conference will cover various topics of field of Fluid Mechanics such as: Turbulence, Computational Fluid Dynamics, Multiphase Flows, Compressible Flow and Industrial Applications.

Topics: DTIC Archive, EINDHOVEN UNIV OF TECH (NETHERLANDS), *COMPUTATIONAL FLUID DYNAMICS, *GAS DYNAMICS,...

The conference's purpose was to inform the fluid physics community of research opportunities in reduced-gravity fluid physics, present the status of the existing and planned reduced gravity fluid physics research programs, and inform participants of the upcoming NASA Research Announcement in this area. The plenary sessions provided an overview of the Microgravity Fluid Physics Program, present and future areas of emphasis, information on NASA's ground-based and space-based flight research...

Topics: NASA Technical Reports Server (NTRS), CONFERENCES, FLUID DYNAMICS, MICROGRAVITY, SPACEBORNE...

Some ground motion records in HE field tests, e.g., MISERS BLUFF II-2 and PRE-MINE THROW IV-6, exhibit an enhanced upward velocity immediately following the initial airblast-induced downward motion. Also, laboratory experiments show the development of upward soil motions during positive air overpressure loadings; the motion in the laboratory tests was shown to be related to the flow of the air through the soil pores. In this report, the effects of pore-air (dry porous soils can have 30-40% of...

Topics: DTIC Archive, Rosenblatt,M, CALIFORNIA RESEARCH AND TECHNOLOGY INC CHATSWORTH, *GROUND MOTION,...

We developed a novel approach to extend the particle level set method to the simulation of as many regions as desired. The various regions can be liquids or gases of any type with differing viscosities, densities, viscoelastic properties, etc. We also proposed techniques for simulating interactions between materials, whether it be simple surface tension forces or more complex chemical reactions with one material converting to another or two materials combining to form a third. When discretizing...

Topics: DTIC Archive, Fedkiw, Ron, STANFORD UNIV CA, *ALGORITHMS, *IMAGE PROCESSING, *COMPUTATIONAL FLUID...

The current research goal is the development of a quantitative understanding and a theoretical treatment of the scattering of sound by non-spherical compressible objects (microbubbles) in multiphase media in the 1-10kHz region. The second research goal was to explain the observed nonlinear power law frequency-dependent attenuation at lower frequencies ( less than or equal to 1 kHz ) Biot (1956) [1], Burridge and Keller(1981) [2], and Stoll(1989) [3] predicted that the sandy-sediment...

Topics: DTIC Archive, BOSTON UNIV MA DEPT OF AEROSPACE AND MECHANICAL ENGINEERING, *ACOUSTIC VELOCITY,...

Mixing of multi-phase fluids is common in diverse research fields, and understanding of such an important phenomenon is useful to a range of engineering applications such as the polymer blender or control and designs of fluid processing. In this paper we adopt the phase-field modeling approach to investigate capillary induced effects on mixing. Phase-field modeling has been applied to simulation of multi-phase flow (Chella & Vinals 1996; Jasnow & Vinals 1996; Jacqmin 1999) due to its...

Topics: DTIC Archive, Young, Y. -N., STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING, *TURBULENT FLOW,...

Generally, two types of theory are used to describe the field equations for suspensions. The so-called postulated equations are based on the kinetic theory of mixtures, which logically should give reasonable equations for solutions. The basis for the use of such theory for suspensions is tenuous, though it at least gives a logical path for mathematical arguments. It has the disadvantage that it leads to a system of equations which is underdetermined, in a sense that can be made precise. On the...

Topics: NASA Technical Reports Server (NTRS), MULTIPHASE FLOW, SOLUTIONS, STRESS DISTRIBUTION, CONSTITUTIVE...

Analytic studies and experimental measurements of the velocity of sound in a two-phase mixture of gas and liquid were performed to provide a basis for analyzing performance of fluid computing networks with multiphase fluids and to stimulate the application of such conditions to fluid computation. In particular, the work was directed toward the investigation of mixtures with a large percentage of gas, a regime where little experimental data has been available. The analytic studies include a...

Topics: DTIC Archive, BOWLES ENGINEERING CORP SILVER SPRING MD, *FLUID AMPLIFIERS, *MULTIPHASE FLOW, FLUID...

A numerical algorithm and the corresponding paralleled implementation for the study of magnetohydrodynamics (MHD) of large density ratio, three-dimensional multiphase flows at low magnetic Reynolds numbers have been developed. The algorithm employs the method of front tracking for the propagation of material interfaces and the embedded interface method for solving elliptic-parabolic problems associated with approximations of incompressible fluids and low magnetic Reynolds numbers. The use of...

Topics: DTIC Archive, STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF APPLIED MATHEMATICS AND STATISTICS,...

Fluorescence-based flow cytometry dates back to the 1960s. Essentially, cells or particles are aligned in a flow stream and optically interrogated. Size, density, and fluorescence at multiple wavelengths can be quantified. In many cases, tags, such as fluorescently labeled antibodies, are mixed with the samples prior to analysis so that specific targets or cell functions can be identified. Currently, large, complex, laboratory- based flow cytometers are required to perform medical diagnostics,...

Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC CENTER FOR BIOMOLECULAR SCIENCE AND ENGINEERING,...

The physical scales of velocity, length, time, thermal gradient magnitude likely to be involved in gas-solid multiphase flight experiments are assessed for 1-100 micron particles.

Topics: NASA Technical Reports Server (NTRS), GRAVITATIONAL EFFECTS, MULTIPHASE FLOW, TEMPERATURE...

An Inverse Design Method suitable for radial and mixed flow turbomachinery is presented. The codes are based on the streamline curvature concept; therefore, it is applicable for current personal computers from the 286/287 range. In addition to the imposed aerodynamic constraints, mechanical constraints are imposed during the design process to ensure that the resulting geometry satisfies production consideration and that structural considerations are taken into account. By the use of Bezier...

Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED DESIGN, COMPUTER PROGRAMS, MULTIPHASE FLOW,...

This report results from a contract tasking American University of Beirut as follows: It has been determined that the segregated class of algorithms and the many techniques developed for single fluid flow, has not been fully extended to multi-fluid flows. Thus the main objectives of this work are: (1) To extend the applicability of the available segregated class of algorithms for single fluid flow at all speeds to multi-fluid flow at all speeds; (2) To derive these algorithms using a unified,...

Topics: DTIC Archive, Moukalled, F, AMERICAN UNIV BEIRUT (LEBANON), *ALGORITHMS, *COMPUTATIONAL FLUID...

342
342

May 23, 2011
05/11

by
Shen, Thomas C.; Fong, Michael M

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Studies of divinylbenzene copolymers and dimethacrylate homopolymers indicate that the polymer pore size controls the separation of water and ammonia on porous-layer-open-tubular (PLOT) columns. To a lesser degree, the polarity of the polymers also affects the separation of a water-ammonia gas mixture. Our results demonstrate that the pore size can be regulated by controlling the cross-linking density or the chain length between the cross-linking functional groups. An optimum pore size will...

Topics: TURBULENCE MODELS, PARTICULATES, SPHERES, BOUNDARY CONDITIONS, REYNOLDS EQUATION, MULTIPHASE FLOW,...

Experimental studies of two types of drop/gas interactions that are important in the near injector, dense region of sprays were carried out, as follows: (1) secondary drop breakup, which tends to control transport processes in dense sprays; and (2) turbulence generation by rapidly moving drops in gas environments, which tends to control interphase turbulence production in dense sprays. The drop breakup measurements showed that breakup should be treated as a rate process rather than by jump...

Topics: DTIC Archive, Chen, J. H., MICHIGAN UNIV ANN ARBOR, *TURBULENCE, *SPRAYS, *MULTIPHASE FLOW,...

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331

Jul 26, 2010
07/10

by
Mirick, Paul H.; Hamouda, M-Nabil H.; Yeager, William T., Jr

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A survey was conducted of the flow field produced by the Airstream Oscillator System (AOS) in the Langley Transonic Dynamics Tunnel (TDT). The magnitude of a simulated gust field was measured at 15 locations in the plane of a typical model helicopter rotor when tested in the TDT using the Aeroelastic Rotor Experimental System (ARES) model. These measurements were made over a range of tunnel dynamic pressures typical of those used for an ARES test. The data indicate that the gust field produced...

Topics: CORRELATION, LIGHT SCATTERING, LIQUID SURFACES, MOMENTUM TRANSFER, TRANSONIC SPEED, CRYOGENICS, JET...

1,607
1.6K

May 23, 2011
05/11

by
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Electric powertrain technologies with application to high altitude Unmanned Aerial Vehicles (UAV) are assessed. One hundred twenty five solar electric UAV configurations and missions were simulated. Synergistic design opportunities were investigated with the premise that specific benefits may be realized, for example, if a single component can serve multiple functions, such as a battery being used for energy storage as well as for a structural component of the aircraft. For each UAV mission...

Topics: ACOUSTIC PROPERTIES, THRUST, DOMINANCE, PENETRATION, JET AIRCRAFT NOISE, NOISE REDUCTION, UNIFORM...

Two phase liquid and gaseous nitrogen flow in a pneumatic two fluid atomizer was investigated. Characteristic dropsize for cryogenic sprays were measured with a scattered light scanning instrument developed at NASA-Lewis. Tests were conducted primarily in the aerodynamic stripping regime of liquid jet atomization. At a sampling distance of bar-x=1.3 cm, the Sauter mean, D(sub 32), and volume median, D(sub v.5), drop diameters were measured and correlated with nitrogen gas flowrate, W(sub n), to...

Topics: NASA Technical Reports Server (NTRS), CRYOGENIC FLUIDS, FLOW VELOCITY, GAS FLOW, GAS JETS,...

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249

May 29, 2011
05/11

by
Tarokh, M.; Shiller, Z.; Hayati, S

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The paper presents two path planners suitable for planetary rovers. The first is based on fuzzy description of the terrain, and genetic algorithm to find a traversable path in a rugged terrain. The second planner uses a global optimization method with a cost function that is the path distance divided by the velocity limit obtained from the consideration of the rover static and dynamic stability. A description of both methods is provided, and the results of paths produced are given which show...

Topics: BIOMASS, LAGRANGIAN FUNCTION, PARTICULATES, REYNOLDS STRESS, VAPOR PHASES, MULTIPHASE FLOW,...

A ski jump model was developed to predict ski jump takeoff performance for a short takeoff and vertical landing (STOVL) aircraft. The objective was to verify the model with results from a piloted simulation of a mixed flow, remote lift STOVL aircraft. The prediction model is discussed. The predicted results are compared with the piloted simulation results. The ski jump model can be utilized for basic research of other thrust vectoring STOVL aircraft performing a ski jump takeoff.

Topics: NASA Technical Reports Server (NTRS), PERFORMANCE PREDICTION, SIMULATION, STOVL AIRCRAFT, TAKEOFF,...

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Sep 20, 2010
09/10

by
Hansen, Vicki L.; Keep, Myra; Herrick, Robert R.; Phillips, Roger J

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Eastern Aphrodite Terra is approximately equal in size to the western North American Cordillera, from Mexico to Alaska. Its size and unique landforms make it an important area for understanding the tectonics of Venus, yet models for its formation are diametrically opposed. This region is part of the Equatorial Highlands, which was proposed as a region of lithospheric thinning, isostatic uplift, and attendant volcanism. Eastern Aphrodite Terra is dominated by circular structures within which...

Topics: CRYOGENIC FLUIDS, DROPS (LIQUIDS), GAS ATOMIZATION, HEAT TRANSFER COEFFICIENTS, DROP SIZE, FUEL...

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Jun 12, 2011
06/11

by
How, Jonathan P

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The final report for the Orion-II project is taken from Chapter 5 of ''CDGPS-Based Relative Navigation for Multiple Spacecraft,'' a thesis by Megan Mitchell submitted to the MIT Department of Aeronautics and Astronautics, June 2004. This chapter begins with a comparison of the simulation architecture for the original and current simulation setups. Next, the changes made to the individual components of the navigation system are described. Finally, tests performed with a Spirent Simulator at NASA...

Topics: COMPUTERIZED SIMULATION, ACOUSTICS, NAVIER-STOKES EQUATION, TURBULENCE MODELS,...

Supersonic jet exhaust impinging onto a flat surface is a fundamental flow encountered in space or with a missile launch vehicle system. The flow is important because it can endanger launch operations. The purpose of this study is to evaluate the effect of a landing rocket s exhaust on soils. From numerical simulations and analysis, we developed characteristic expressions and curves, which we can use, along with rocket nozzle performance, to predict cratering effects during a soft-soil landing....

Topics: NASA Technical Reports Server (NTRS), IMPINGEMENT, JET EXHAUST, MULTIPHASE FLOW, NUMERICAL...

In April, 1989, a workshop on constitutive relationships and models in continuum theories of multiphase flows was held at NASA's Marshall Space Flight Center. Topics of constitutive relationships for the partial or per phase stresses, including the concept of solid phase pressure are discussed. Models used for the exchange of mass, momentum, and energy between the phases in a multiphase flow are also discussed. The program, abstracts, and texts of the presentations from the workshop are...

Topics: NASA Technical Reports Server (NTRS), CONSTITUTIVE EQUATIONS, CONTINUUM MECHANICS, MATHEMATICAL...