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Sunday, April 26, 2020 | History

2 edition of Low-density nozzle flow by the direct simulation Monte Carlo and continuum methods found in the catalog.

Low-density nozzle flow by the direct simulation Monte Carlo and continuum methods

Low-density nozzle flow by the direct simulation Monte Carlo and continuum methods

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  • 17 Currently reading

Published by American Institute of Aeronautics and Astronautics, [National Aeronautics and Space Administration, National Technical Information Service, distributor in Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Computerized simulation.,
  • Gas dynamics.,
  • Monte Carlo method.,
  • Navier-Stokes equation.,
  • Surface reactions.,
  • Continuums.,
  • Energy transfer.,
  • Finite volume method.

  • Edition Notes

    Other titlesLow density nozzle flow by the direct simulation Monte Carlo and continuum methods
    StatementC.-H. Chung ... [et al.].
    SeriesNASA contractor report -- NASA CR-203335
    ContributionsChung, C.-H., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17129078M

    Direct simulation methods for low-speed microchannel flows. C Cai, ID Boyd, J Fan, GV Candler Experimental and numerical investigations of low-density nozzle and plume flows of nitrogen. D Boyd, PF Penko, DL Meissner, KJ DeWitt Models for direct Monte Carlo simulation of coupled vibration–dissociation. BL Haas, ID Boyd. The gas flow inside the channel is continuum and inviscid in nature and is solved using an equilibrium direct simulation Monte Carlo (eDSMC) approach. The difference of gas and ice grains properties obtained with the two methods for a conical nozzle shape are found to be large. / DSMC simulation of near-field enceladus plumes from tiger Cited by: 1. DAC DSMC Analysis Code DSMC Direct Simulation Monte Carlo L vehicle reference length, m L/D lift-to-drag ratio n number density, molecules/m Abstract The Direct Simulation Monte Carlo (DSMC) Analysis Code (DAC), as released by NASA, is a general purpose, gas dynamic, transport analysis suite of .


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Low-density nozzle flow by the direct simulation Monte Carlo and continuum methods Download PDF EPUB FB2

Evaluation of particle-based continuum methods for a coupling with the direct simulation Monte Carlo method based on a nozzle expansion Physics of Fluids, Vol. 31, No. 7 Coupled ellipsoidal statistical BGK-DSMC simulations of a nozzle expansionCited by: Get this from a library.

Low-density nozzle flow by the direct simulation Monte Carlo and continuum methods. [C -H Chung; United States. National Aeronautics and Space Administration.;]. Low-Density Nozzle Flow by the Direct Simulation Monte Carlo and Continuum Methods Chan-Hong Chung,* Suk C.

Kim,t and Robert M. Stubbs:_: NASA Lewis Research Center, Cleveland. Ohio and Kenneth J. De Witt§ University of Toledo, Toledo, Ohio Twn different approaches, the direct simulation Monte Carlo II)SMC) method based nn.

Abstract Two different approaches, the direct simulation Monte Carlo (DSMC) method based on molecular gasdynamics, and a finite-volume approximation of the Navier-Stokes equations, which are based on continuum gasdynamics, are employed in the analysis of a low-density gas flow in a small converging-diverging nozzle.

The flow transitions from continuum to free molecular regimes. Conventional continuum gas dynamics may not be adequate to accurately analyze the flow and an approach based on kinetic theory may be required.

Of various methods available for analysis of low-density gas flows, the direct simulation Monte-Carlo (DSMC).

Evaluation of particle-based continuum methods for a coupling with the direct simulation Monte Carlo method based on a nozzle expansion “ Low-density nozzle flow by the direct simulation Monte Carlo and continuum methods,” J.

by: 2. In this work, direct simulation Monte Carlo computations have been performed to investigate flow separation and reattachment in a low-density hypersonic flow over such a configuration.

Distinct features of leading-edge flow, limited boundary layer growth, separation, shear layer, flow structure in the recirculation region and reattachment are.

On the Validation of Direct Simulation Monte Carlo Method for Low Reynolds Number Micro-Nozzle Resisto-Jets IEPC Presented at the 35th International Electric Propulsion Conference Georgia Institute of Technology { Atlanta, Georgia { USA October 8{12, Timothy D.

Holman and Michael F. Osborn Naval Research Laboratory, Washington D.C. Numerical Simulation of Nozzle Flow into High Vacuum Using Kinetic and Continuum Approaches Martin Grabe1, Stefanos Fasoulas2, and Klaus Hannemann1 1 DLR, Bunsenstraße 10, D Göttingen, Germany 2 Technische Universität Dresden, ILR, D Dresden, Germany Summary Laminar nitrogen flow expanding through a conical nozzle int o high vacuum is to.

A coupled particle-continuum simulation method is presented to compute the multicomponent mixture plume flow from the attitude-control engines of a satellite through the use of the Navier–Stokes solver and direct simulation Monte Carlo method.

In this study, the implicit hybrid flux iteration scheme for the axisymmetric compressible Navier–Stokes equations is constructed to solve the inner Cited by: 7. The use of direct simulation Monte Carlo (DSMC) codes in the analysis of low-density flow or, more generally, flows containing regions of strong translational non-equilibrium, is justified by.

Two different approaches, the direct-simulation Monte Carlo (DSMC) method based on molecular gas dynamics and a finite-volume approximation of the Navier-Stokes equations, which are based on continuum gas dynamics, are employed in the analysis of a low-density gas flow in a small converging-diverging nozzle.

Direct Simulation Monte Carlo (DSMC) is a particle-based technique for simulating low-density fluid flows -- those with a ratio of mean-free path to geometry scale (the Knudsen number) of order or greater. The basic idea is simple. • Direct simulation Monte Carlo (DSMC) method is the Monte Carlo method for simulation of dilute gas flows on molecular level, i.e.

on the level of individual molecules. To date DSMC is the basic numerical method in the kinetic theory of gases and rarefied gas dynamics. • Kinetic theory of gases is a part of statistical physics where the flowFile Size: 1MB. A new semi-empirical thruster plume model is presented based on recent experimental and numerical (Direct Simulation Monte Carlo) studies.

The results are unique in that they pertain to unprecedentedly low flow rates (nozzle Reynolds numbers below ).Author: Y.R. Jafry, J. Vanden Beukel, I.D. Boyd, D.B. DeBra. The gold-standard definition of the Direct Simulation Monte Carlo (DSMC) method is given in the book by Bird [Molecular Gas Dynamics and the Direct Simulation of Gas Flows (Clarendon Press, Oxford, UK, )], which refined his pioneering earlier papers in which he first formulated the the intervening 25 years, DSMC has become the method of choice for modeling rarefied gas Cited by: 3.

An experimental micro nozzle analysis with throat of µm was investigated by Grisnik et al., and Zelesnik et al. compared their results obtained from direct simulation Monte Carlo methods with Grisnik's experiment.

They stated that boundary layer growth can result in a significant viscous dissipation and raise the temperature of the flow Cited by: Two different approaches, the direct simulation Monte Carlo (DSMC) method based on molecular gasdynamics, and a finite-volume approximation of the Navier-Stokes equations, which are.

Low-density nozzle flow by the direct simulation Monte Carlo and continuum methods. The direct simulation Monte Carlo method was applied to the analysis of low-density nitrogen plumes exhausting from a small converging-diverging nozzle into finite ambient pressures.

The Direct Simulation Monte Carlo method is currently being applied to study flowfields of small thrusters, including both the internal nozzle and the external plume flow.

The DSMC method is employed because of its inherent ability to capture nonequilibrium effects and proper boundary physics in low-density flow that are not readily obtained by continuum methods. Language Two different approaches, the direct simulation Monte Carlo (DSMC) method based on molecular gasdynamics, and a finite-volume approximation of the Navier-Stokes equations, which are based on continuum gasdynamics, are employed in the analysis of a low-density gas flow in a small converging-diverging nozzle.

() A review and perspective on a convergence analysis of the direct simulation Monte Carlo and solution verification. Physics of Fluids() On the basic concepts of the direct simulation Monte Carlo by: Bird, G.A.: Molecular Gas Dynamics and the Direct Simulation of Gas Flows. () Numerical Simulation of Nozzle Flow into High Vacuum Using Kinetic and Continuum Approaches.

In: Dillmann A., Heller G., Klaas M., Kreplin HP., Nitsche W., Schröder W. (eds) New Results in Numerical and Experimental Fluid Mechanics VII. Cited by: 3. [1] Kammara, K.K., Malaikannan G., Kumar, R., “Molecular Dynamics Study of Gas-Surface Interactions in a Force Driven Flow of Argon through a Rectangular Channel,” Nanoscale and Microscale Thermophysical Engineering, 20, ().

[2] Chinnappan, A.K., Kumar, R., “Modeling of High Speed Gas-Granular Flow over a 2D Cylinder in Direct Simulation Monte Carlo Framework,” Granular.

International Journal of Aerospace Engineering / / Article. Article Sections. On this page. “Low-density nozzle flow by the direct simulation Monte Carlo and continuum methods,” Journal of Propulsion and Power, vol. 11, no. 1, pp. 64–70, Cited by: 4.

Boltzmann Equation Knudsen Number Direct Simulation Velocity Distribution Function Direct Simulation Monte CARLO Method These keywords were added by machine and not by the authors.

This process is experimental and the keywords may be updated as the learning algorithm by: 4. Among several methods, the Direct Simulation Monte Carlo (DSMC) method [5,6] has been mostly employed to analyze the plume flowfields in the vacuum because it can accurately simulate a rarefied transition regime and a free molecular flow at the far field from the thruster nozzle exit as shown in Fig 2 [3,4] by solving the Boltzmann equation Cited by: 5.

The direct simulation Monte Carlo (DSMC) analysis of two- and three-dimensional rarefied gas flows requires computational resources of very large proportions. One of the major causes for this is that, along with the multidimensional computational mesh, the standard DSMC approach also requires a large number of particles in each cell of the mesh Cited by: one needs to employ statistical methods to charac-terize the flow.

The theoretical framework for these descriptions is layed out by the Kinetic Theory of Gases. The most efficient, robust and most popular nu-merical method today for treating rarefied gas flows is called Direct Simulation Monte Carlo (DSMC) [3]. The principles of and procedures for implementing direct simulation Monte Carlo (DSMC) are described.

Guidelines to inherent and external errors common in DSMC applications are provided. Three applications of DSMC to transitional and nonequilibrium flows are considered: rarefied atmospheric flows, growth of thin films, and microsystems.

Selected new, potentially important advances in DSMC Cited by: The book assembles many current topics in theoretical and numerical gas dynamics that, until now, were only accessible from the original journal articles. It also has a clear, detailed description of Direct Simulation Monte Carlo (DSMC), which is the dominant numerical method for the simulation.

made in the exit plane and plume of a low-density, nitrogen nozzle flow. Two numerical computer codes were used to analyze the flow, including one based on continuum theory using the explicit MacCormack method, and the other on kinetic theory using the method of direct-simulation Monte Carlo (DSMC).

The continuum analysis was carried to the nozzle. Computation of Hypersonic Flows Using the Direct Simulation Monte Carlo Method the methods used in direct simulation Monte Carlo are described for simulation of high-temperature, real regions of a flow may contain low density (e.g., the wake behind a capsule)orsmalllengthscales(e.g.,sharpleadingedgesonavehicle.

Direct simulation Monte Carlo investigation of mixed supersonic–subsonic flow through micro-/nano-scale channels. Hassan Akhlaghi, Mojtaba Balaj and Ehsan Roohi. Published 30 May • The Royal Swedish Academy of Sciences Physica Scripta, Vol Number 1. Low-density nozzle flow by the Direct Simulation Monte Carlo and continuum methods.

J Propul Power ; 11(1): 64– View Article Google Scholar Lee KH, Lee SN, Yu MJ, Kim SK, Baek SW. Combined analysis of thruster plume behavior in rarefied region by preconditioned Navier-Stokes and DSMC methods. direct simulation Monte Carlo (DSMC) method is used to calculate gas properties in regions of relatively low density flow.9 The variable hard sphere (VHS) collision model is employed to approximate the variation in transport properties with temperature, and the Larsen-Borgnakke model9 is used together with a total collision energy model.

experimentally.7,8 Then numerical methods were pro-posed by Rae9 and Boyd et al for investigating the converging–diverging nozzles. Boyd used a direct simulation Monte Carlo (DSMC) method and proved that this method is accurate enough to analyze the flow especially in the expanding section of thruster with a near vacuum exit boundary.

The simulation technique uses the Direct Simulation Monte Carlo method to accurately model rarefied gas flow. Results are presented for a parametric study of the GEC reference cell using several flow configurations of industrial relevance.

flow, the Direct Simulation Monte Carlo algorithm was used on the BYU cone which will feature non-continuum effects, requiring a technique like DSMC. It After flowing through the nozzle, part of the low-density supersonic flow is sent to the mass spectrometer.

SIMULATION TECHNIQUES IN HYPERSONIC LOW-DENSITY AEROTHERMODYNAMICS V. Riabov Rivier University, South Main Street, Nashua, NHUSA, [email protected] Hypersonic rarefied flows near a wedge, disk, plate, and sphere were studied under the condi-tions of wind-tunnel experiments [] and hypersonic flights.

The direct simulation Monte. To predict the behaviors of thruster plume quantitatively, a numerical analysis with a parallel Direct Simulation Monte Carlo (DSMC) method using unstructured three-dimensional meshes is conducted.

The interaction between the exhausted plumes from four monopropellant hydrazine thrusters and the satellite components, such as an S-band antenna, a.

This paper describes the numerical analysis of the flow structure of a single underexpanded argon free jet issuing into a lower-pressure or vacuum environment using the parallel three-dimensional direct simulation Monte Carlo (DSMC) Cited by: The validity of employing the Direct Simulation Monte Carlo method to model nozzle exhaust flows in low vacuum has been established in recent years by Boyd and others [,], where its primary use has been to understand the interaction of satellite.