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  • 1
    Electronic Resource
    Electronic Resource
    Vortex Rings (1992)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 24 (1992), S. 235-279 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fl.24.010192.001315
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Acoustics and dynamics of coaxial interacting vortex rings
    Amsterdam : Elsevier
    Fluid Dynamics Research 3 (1988), S. 337-343 
    Details
    ISSN: 0169-5983
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0169-5983(88)90088-3
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    Paper (German National Licenses)
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  • 3
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    Dynamic Adsorption of CO2 from Methane: Studies on Mass and Heat Transfer (2013)
    Wiley
    Details
    Publication Date: 2013-01-08
    Description: Three-dimensional computational fluid dynamics studies related to dynamics adsorption of CO 2 from natural gas is found to be limited. 3D analyses for dynamics adsorption are substantially crucial to give a better prediction on the adsorption process by considering the actual fluid flow behavior within the packed-bed porous media. A kinetic adsorption model has been integrated in a commercial fluid dynamics simulator to simulate the 3D hydrodynamics and adsorption phenomenon in a zeolite-filled packed column for a CO 2 -methane separation system. The effects of various parameters such as Reynolds number, CO 2 feed concentration, feed temperature, and column dimension on CO 2 adsorption efficiency have been investigated. A correlation for adsorption efficiency based on the CO 2 concentration profiles has been developed and validated. A dynamic numerical computational fluid dynamics model was integrated into a commercial fluid dynamics simulator and validated to simulate the fluid flow and transport phenomena for separation of CO 2 -CH 4 in a packed-bed adsorption column. The simulation results demonstrated a realistic pattern for the effects of operating parameters on adsorption dynamics.
    Print ISSN: 0930-7516
    Electronic ISSN: 1521-4125
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley
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  • 4
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    S-band gain and noise figure improvements in thulium-doped fiber amplifier by using macro-bending approach (2012)
    Springer
    Details
    Publication Date: 2012-09-01
    Print ISSN: 0946-2171
    Electronic ISSN: 1432-0649
    Topics: Physics
    Published by Springer
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  • 5
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    Vortex Rings (1992)
    Annual Reviews
    Details
    Publication Date: 1992-01-01
    Print ISSN: 0066-4189
    Electronic ISSN: 1545-4479
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Annual Reviews
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  • 6
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    Instabilities of two-dimensional inviscid compressible vortices (1993)
    Cambridge University Press
    Details
    Publication Date: 1993-08-01
    Description: The linear stability and subsequent nonlinear evolution and acoustic radiation of a planar inviscid compressible vortex is examined. Linear-stability analysis shows that vortices with smoother vorticity profiles than the Rankine vortex considered by Broadbent & Moore (1979) are also unstable. However, only neutrally stable waves are found for a Gaussian vorticity profile. The effects of entropy gradient are investigated and for the particular entropy profile chosen, positive average entropy gradient in the vortex core is destabilizing while the opposite is true for negative average entropy gradient. The linear initial-value problem is studied by finite-difference methods. It is found that these methods are capable of accurately computing the frequencies and weak growth rates of the normal modes. When the initial condition consists of random perturbations, the long-time behaviour is found to correspond to the most unstable normal mode in all cases. In particular, the Gaussian vortex has no algebraically growing modes. This procedure also reveals the existence of weakly decaying and neutrally stable waves rotating in the direction opposite to the vortex core, which were not observed previously. The nonlinear development of an elliptic-mode perturbation is studied by numerical solution of the Euler equations. The vortex elongates and forms shocklets; eventually, the core splits into two corotating vortices. The individual vortices then gradually move away from each other while their rate of rotation about their mid-point slowly decreases. The acoustic flux reaches a maximum at the time of fission and decreases as the vortices move apart. © 1993, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 7
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    A High-Resolution Hybrid Compact-ENO Scheme for Shock-Turbulence Interaction Problems (1996)
    Elsevier
    Details
    Publication Date: 1996-08-01
    Print ISSN: 0021-9991
    Electronic ISSN: 1090-2716
    Topics: Computer Science , Physics
    Published by Elsevier
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  • 8
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    Vortex ring instability and its sound (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: This work carries earlier finite-difference calculations of the Widnall instability of vortex rings into the late non-linear stage. Plots of energy in azimuthal Fourier modes indicate that low-order modes dominate at large times; their structure and dynamics remain unexplored, however. An attempt was made to calculate the acoustic signal using the theory of Mohring (1978), valid for unbounded flow. This theory shows that only low-order azimuthal modes contribute to the sound. As a check on the effects of axial periodicity and a slip wall at large radius imposed by the numerical scheme, the acoustic integrals were also computed in a truncated region. Half of the terms contributing to the sound have large differences between the two regions, and the results are therefore unreliable. The error is less severe for a contribution involving only the m = 2 mode, and its low frequency is consistent with a free elliptic bending wave on a thin ring.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Stanford Univ., Studying Turbulence Using Numerical Simulation Databases. 5: Proceedings of the 1994 Summer Program; p 221-228
    Format: application/pdf
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  • 9
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    Homogeneous turbulence subjected to mean flow with elliptic streamlines (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Direct numerical simulations are performed for homogeneous turbulence with a mean flow having elliptic streamlines. This flow combines the effects of rotation and strain on the turbulence. Qualitative comparisons are made with linear theory for cases with high Rossby number. The nonlinear transfer process is monitored using a generalized skewness. In general, rotation turns off the nonlinear cascade; however, for moderate ellipticities and rotation rates the nonlinear cascade is turned off and then reestablished. Turbulence statistics of interest in turbulence modeling are calculated, including full Reynolds stress budgets.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Stanford Univ., Studying Turbulence Using Numerical Simulation Databases. 5: Proceedings of the 1994 Summer Program; p 355-371
    Format: application/pdf
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  • 10
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    Simulation and modeling of the elliptic streamline flow (1996)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Direct numerical simulations are performed for the elliptic streamline flow, which is a homogeneous turbulent flow that combines the effects of solid body rotation and strain. Simulations are run over a range of parameters in order to determine the effect of changing rotation and strain separately. For early times the nonlinear cascade is suppressed, but then is re-established at later times. The growth rate of turbulent kinetic energy agrees at early times with the trends from linear theory, but at later times the flow seems to approach an asymptotic state that is independent of the ratio of mean flow rotation rate to strain rate. A comparison with standard Reynolds stress turbulence models is made. It is found that for strong rotation rates, the models predict decay of the turbulence, while the simulations show exponential growth. Close examination of the simulation results shows that they are affected by excessively low Reynolds numbers. Suggestions for reducing low Reynolds number effects in future simulations is given.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: Studying Turbulence Using Numerical Simulation Databases; Part 6; 433-446; NASA-TM-111953
    Format: application/pdf
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