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  • 1
    Electronic Resource
    Electronic Resource
    Dynamics of ripple bed vortices (1998)
    Springer
    Experiments in fluids 25 (1998), S. 265-275 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  This paper presents the results of an experimental investigation into the dynamics of vortices formed by and shed from ripples under oscillatory motion. Particle Image Velocimetry (PIV) was used to acquire detailed velocity measurements at several phases of oscillation for each of four flow conditions: three purely horizontal oscillations and a ‘real’ wave with a vertical velocity component. For each of the flows, the vortices were located in the flow maps and defined at each time-step by their circulations and sizes. These calculated characteristics were compared with the predictions from a discrete-vortex model (DVM) developed at the University of Wales, Bangor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050229
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The modulation of short waves riding on solitary waves (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 3317-3323 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The modulation of linear short waves riding on a long finite-amplitude solitary wave has been analyzed numerically. It is found that the maximum modulated wave number, frequency, and amplitude of short waves always occur at the crest of solitary waves. This paper shows that the modulated wave number on the crest of solitary waves increases significantly as the amplitude of the solitary waves increases, and that the modulated short wave frequency and amplitude on the crest increase almost linearly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868064
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of a lattice gas model for surface gravity waves (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 9 (1997), S. 2585-2597 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A recently proposed lattice gas model for simulating surface waves at a free boundary is described in detail. Simulated waves are compared to linear theory and are seen to compare well, provided an additional parameter ε is introduced. This parameter, ε, is investigated and found to be required due to the density gradient produced across the fluid by the gravitational interaction. Its value and the values of the other model parameters are found for a range of gravitational strengths. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869375
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Lattice Boltzmann modeling of interfacial gravity waves (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 10 (1998), S. 1490-1511 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel numerical technique for simulating interfacial gravity waves is considered. The model comprises an immiscible, binary fluid lattice Boltzmann model incorporating a gravitational interaction and simulates two immiscible, viscous fluids of different densities with a sharp interface between them. The model is described and the accuracy of the technique is considered. Simulation results are presented and the wave velocities, the oscillation frequency and the damping rate are found and compared to theory. A good comparison is found suggesting that the lattice Boltzmann approach is indeed accurately mimicking the wave dynamics. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869669
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  • 5
    Electronic Resource
    Electronic Resource
    Fiber-optic-bundle delivery system for high peak power laser particle image velocimetry illumination (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2675-2679 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We demonstrate the design and implementation of a fiber-optic-bundle beam delivery system for particle image velocimetry (PIV) applications. The system is designed for the transmission of high peak power pulses ((approximately-greater-than)20 mJ) from a Q-switched and frequency doubled Nd:YAG laser. A fiber bundle offers advantages over a single fiber in beam delivery systems for light sheet formation. The damage-limit-maximum power that can be transmitted is greater for the bundle than for any of its component fibers, and the quality of the derived light sheet is higher than that obtainable from a single large core fiber of power handling capacity equivalent to that of the bundle. The beam delivery system was demonstrated in PIV measurements on a premixed propane-air flame. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147093
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  • 6
    Electronic Resource
    Electronic Resource
    Principles and practice of laser-Doppler anemometry: second edition - R. Durst, A. Melling and J.H. Whitelaw Academic, 1981, pp 450, £24.80, 60
    Amsterdam : Elsevier
    Optics and Laser Technology 14 (1982), S. 325 
    Details
    ISSN: 0030-3992
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0030-3992(82)90037-8
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  • 7
    Electronic Resource
    Electronic Resource
    Optical methods and data processing in heat and fluid flow
    Amsterdam : Elsevier
    Optics and Laser Technology 24 (1992), S. 308 
    Details
    ISSN: 0030-3992
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0030-3992(92)90080-L
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of Polymer Additive on Grid Turbulence (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 1196-1197 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Tests were made both with tap water and 80 p.p.m. by weight polyacrylamide solutions ('Separan AP3W) in tap water. Fig. 1 shows a plan of the layout of the apparatus. The liquid is pumped from a storage reservoir through a 90 cm long rectangular channel, 5 cm wide and 6 cm deep, and measurements ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2241196a0
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  • 9
    Electronic Resource
    Electronic Resource
    An analysis of simulators and tracking systems for laser Doppler velocimeters (1973)
    Springer
    Optical and quantum electronics 5 (1973), S. 71-89 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Analogue and digital techniques are proposed for the simulation of signals arising in laser Doppler velocimeters. Their merits are evaluated. Of special interest is the estimation of the instantaneous frequency of the Doppler signal from the zero crossing rate. An analysis is presented whereby the biases introduced in this estimation method are derived for two optical configurations of the velocimeter. This analysis is extended to the case of additive Gaussian noise on the signal, and the cumulative effect of additive noise on the zero crossing rate is determined. The so called “drop-out problem” which pervades the frequency estimation of the instantaneous Doppler signal is next considered, and expressions are derived for mean drop-out rate and the mean interval between drop-outs in terms of an arbitrary signal threshold. These should facilitate choice of threshold detection for given rms Doppler signal levels, and in achieving relative compromises in terms of signal bandwidth. Finally a novel form of frequency tracking system is discussed and its performance critically assessed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421903
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    SIMULATION OF WAVE MOTION USING A LATTICE GAS MODEL (1996)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 22 (1996), S. 313-321 
    Details
    ISSN: 0271-2091
    Keywords: lattice gas ; cellular automata ; wave modelling ; standing waves ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The lattice gas model for simulating two-phase flow, proposed by Appert and Zaleski, has been modified by the introduction of gravitational interactions and the new model has been used to simulate standing wave patterns on the free surface of a fluid. The results compare well with linear theory.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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