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Showing 1 to 20 of 58 for “"Gas dynamics"”.
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Optical Filaments and Gas Dynamics in Air
Until now, the propagation dynamics of intense ultrashort laser pulses leading to optical filamentation in air has only been investigated in the frame of a dynamic balance between linear diffraction, Kerr self-focusing and plasma defocusing. This has led to the development of different theories …
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Kinetic algorithms for non-equilibrium gas dynamics
… developed for flows with nonequilibrium thermodynamics and chemistry. These schemes are derived from the Boltzmann equation with the resulting Euler schemes developed as moments of the discretized Boltzmann scheme with a locally Maxwellian velocity distribution. Application of a …
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Stellar and gas dynamics of interacting ring galaxies
… the disk contains one-tenth of its mass in gas and the hydrodynamics equations are solved using the method of Smoothed Particle Hydrodynamics. It is found that axisymmetric collisions between equal mass galaxies produce a strong expanding ring with a complex three-dimensional structure. …
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On bubble dynamics and gas dynamics in open tubes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1997.
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Numerical Methods for All Mach Number flows for Gas Dynamics
… all-Mach number flow for the Euler equations of gas dynamics on staggered grid is presented in this thesis. The system is discretized to second order in space on staggered grid, in a fashion similar to the Nessyahu-Tadmor central scheme for 1D model and Jang-Tadmor central scheme for 2D model, …
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Never breaking quasi-periodic solutions of weakly nonlinear gas dynamics
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1997.
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Application of the Kinetic Theory Approach to Problems in Gas Dynamics
Made available in DSpace on 2014-12-10T23:36:44Z (GMT). No. of bitstreams: 1 7317464.pdf: 3063926 bytes, checksum: 02de115fca0f799917d1dff5d0e3eab6 (MD5) Previous issue date: 1972
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Development of guidelines for exhaust system design from fundamental gas dynamics studies
… the exhaust port pressure history and the gas exchange process in reciprocating four-stroke engines. The study was conducted in four phases. In the first phase, an extensive experimental programme was undertaken, during which key engine performance indicators together with exhaust and …
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Analysis of rock mechanics and gas dynamics of flame-jet thermal spallation drilling
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1986.
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An Approximation for the Twenty-One-Moment Maximum-Entropy Model of Rarefied Gas Dynamics
The use of moment-closure methods to predict continuum and moderately rarefied flow offers many modelling and numerical advantages over traditional methods. The maximum-entropy family of moment closures offers models described by hyperbolic systems of balance laws. In particular, the twenty-one …
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A multi-wavelength study of the dwarf galaxies NGC 2915 and NGC 1705 : star formation, gas dynamics and dark matter
This thesis presents the results of a detailed multi-wavelength study of the nearby blue compact dwarf galaxies NGC 2915 and NGC 1705. The primary data set (nearly 100 hours of on-source data) for each galaxy consists of new observations of the neutral hydrogen (Hi) line obtained with the Australia …
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An Extension of Essentially Non-Oscillatory Shock-Capturing Schemes to Multi-Dimensional Systems of Conservation Laws
… solving the one-dimensional Euler equations of gas dynamics, have aroused considerable interest in the aerodynamic community. However, the application of these schemes to areas of scientific and industrial interest, such as aircraft configuration, obviously requires compressible flow solutions …
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Analysis of a 1D approximation of the Boltzmann Equation: the subclass of grossly determined solutions and the asymptotic behavior of the class of general solutions
… of the Maxwell-Boltzmann equation for a 1D gas. In the manner of classical gas dynamics, we derive a balance law and use it to determine the grossly determined solutions, a sub-class of solutions that are functions dependent on the gas's density field. Then, via spectral decomposition, we …
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Dark Matter in Spiral Galaxies
… to meet this goal, the galaxies' morphology and gas kinematics have been observed and compared to hydrodynamic gas simulations which were performed to predict the gas dynamics arising in response to realistic two dimensional gravitational potentials, combined from stellar disk and dark halo …
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Adaptive Finite Element Methods for the Compressible Euler Equations
… for example the compressible Euler equations of gas dynamics. Based on this finite element method, we develop an adaptive algorithm for the efficient computation of physically relevant quantities of the solution. This includes a posteriori error estimation of the error in the computed quantity as …
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A comparison of the HI and CO velocity dispersions of nearby galaxies
… in some star formation recipes, in studies of gas dynamics, and to determine how much turbulence there is in the interstellar medium. Atomic hydrogen (HI) dispersions have been used in the studies of star formation and large-scale turbulence, despite stars forming in molecular clouds and the …
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A DG HWENO scheme for hyperbolic equations
… solver for the nonlinear Euler equations of gas dynamics, we develop a shock capturing scheme for hyperbolic equations. The Hermite Weighted Essentially Non-Oscillatory (HWENO) methodology introduced by Qiu [10, 14] is used as the starting point for the proposed limiter. We present a general …
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A high-order discontinuous Galerkin multigrid solver for aerodynamic applications
… is outlined for the nonlinear Euler equations of gas dynamics. Analysis of 2-D advection shows the improved performance of line implicit versus block implicit relaxation. Through a mesh refinement study, the accuracy of the discretization is determined to be the optimal O(h[superscript]P+l) for …
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Supersonic flows of Bethe-Zel'dovich-Thompson fluids in cascade configurations
We examine the dense gas behavior of Bethe-Zel'dovich-Thompson (BZT) fluids in two-dimensional, steady, inviscid, supersonic cascade configurations. Bethe-Zel'dovichThompson fluids are single-phase gases having specific heats so large that the fundamental derivative of gas dynamics, Γ, is negative …
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Modeling reactive rarefied flows in Chemical Vapor Infiltration using Direct Simulation Monte Carlo
… silicon carbide (SiC) matrix composites. Gas-phase precursors flow into a porous fiber, react, and deposit to form the ceramic matrix. Deposition quality and rate are strongly influenced by surface reactions, depending on temperature, gas flow, and reactor pressure. This study applies a …
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