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  • 1
    Monograph available for loan
    Monograph available for loan
    Conceptual models in exploration geochemistry : the Canadian Cordillera and Canadian Shield (1975)
    Amsterdam [u.a.] : Elsevier
    Associated volumes
    Details Availability
    Call number: 9/G 5839 ; M 93.0187/2
    In: Developments in economic geology
    In: Association of Exploration Geochemists: Special publication
    Type of Medium: Monograph available for loan
    Pages: IX, 223 S. : graph. Darst.
    ISBN: 0444413146
    Series Statement: Developments in economic geology 2) (Association of Exploration Geochemists special Publication 3
    Location: Reading room
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    The measurement of turbulent fluctuations : an introduction to hot-wire anemometry and related transducers (1983)
    Berlin : Springer
    Details Availability
    Call number: MOP 45820 / Mitte
    Type of Medium: Monograph available for loan
    Pages: XIII, 298 Seiten , Illustrationen
    ISBN: 3540121447 , 0387121447
    Uniform Title: Izmerenie turbulentnych pulʹsacij 〈engl.〉
    Language: English
    Note: Contents Chapter One STATISTICAL DESCRIPTION OF TURBULENCE 1.1 Turbulence as a Random Process 1.2 Statistical Averages of Random Variables 1.3 Stationarity and Homogeneity 1.4 Spectral Decomposition 1.5 Connection Between Correlation and Spectral Functions 1.6 The Equations of Turbulences Chapter Two rlliASUREMENT OF TURBULENT FLUCTUATIONS 2.1 Modeling of Statistical Characteristics of Turbulent Fluctuations 2.2 Experimental Systems 2.3 Thermo-anemometry (Hot-wire and Hot-film) 2.4 Doppler method 2.5 Other Methods of Measuring Turbulent Fluctuations 2.6 Instrumental Processing of Recorded Fluctuations 2.7 Experimental Uncertainties Chapter Three TRANSDUCERS OF FINITE SIZE IN TURBULENT FLUCTUATIONS 3.1 General Relationships 3.2 Spatial and Wave Characteristics of Simple Transducers 3.3 A System of Transducers as Frequency Filter 3.4 Correction Functions for a Field of Velocity Fluctuations Chapter Four STATISTICAL MODELS OF TURBULENT FIELDS 4.1 Models of the Field as a Basis for Correcting the Results of Measurements 4.2 Corcos Model of the Turbulent Pressure Field and Its Simplest Modifications 4.3 Departure from Multiplication Hypothesis 4.4 Diffusion Model 4.5 Convection Model 4.6 Phase Velocity of Cross-Spectrum Chapter Five CORRECTION FUNCTIONS FOR THE PRESSURE FLUCTUATION FIELD 5.1 Power Spectrum 5.2 The Cross-Spectrum 5.3 Measurements with Wave Filters REFERENCES SUBJECT INDEX , Aus dem Russischen übersetzt
    Location: MOP - must be ordered
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  • 3
    Electronic Resource
    Electronic Resource
    A note on "critical roughness height" and "transitional roughness" (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 12 (2000), S. 1611-1614 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An unrigorous but plausible analysis suggests that the concept of a critical roughness height, below which roughness does not affect a turbulent wall flow, is erroneous. The Oseen approximation implies that the effect of roughness on the additive constant in the logarithmic law of the wall should vary as the square of the roughness Reynolds number (specifically the roughness height in "wall units"). This is an important point in determining whether surfaces used in experiments at high unit Reynolds number can be regarded as hydraulically smooth. Attention is also called to the qualitative difference between Nikuradse's measurements of friction factor in pipe flow with uniform-size sand-grain roughness in the "transitional" range of Reynolds number and the data correlation in the Moody chart of 1944; the latter was derived from tests on miscellaneous real-life rough surfaces in the 1930s. Nearly all textbooks on elementary fluid dynamics present, but practically none discuss, this difference. Nikuradse's monodisperse roughness is a very rare case with untypical behavior in the transitional range. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870410
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  • 4
    Electronic Resource
    Electronic Resource
    Compressible Turbulent Shear Layers (1977)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 9 (1977), S. 33-52 
    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.09.010177.000341
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  • 5
    Electronic Resource
    Electronic Resource
    Turbulent Secondary Flows (1987)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 19 (1987), S. 53-74 
    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.19.010187.000413
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  • 6
    Electronic Resource
    Electronic Resource
    On the behavior of two-equation models at the edge of a turbulent region (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 1797-1804 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The flow structure predicted in the vicinity of free-stream edges by two-equation eddy-viscosity turbulence models is examined. Analytical expansions, previously used by several authors, are shown to be weak solutions to the pure nonlinear diffusion problem, connecting with trivial solutions in the nonturbulent region. They remain locally valid solutions to the full one-dimensional system of model equations in the vicinity of the edge, provided that some constraints on the turbulent "Prandtl numbers'' are satisfied. Calculations performed with the (k,ε) turbulence model for a time-evolving mixing layer and a flat-plate boundary layer in zero pressure gradient are fully consistent with the analysis. In contradiction of a prior study by Lele [Phys. Fluids 28, 64 (1985)], the modeled turbulent-kinetic-energy, dissipation-rate, and shear-stress fronts are found to propagate into the nonturbulent region at the same velocity, with no need for any special relationship between the model constants. Implications related to the calibration of models are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868241
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  • 7
    Electronic Resource
    Electronic Resource
    Turbulent transport in wall-bounded flows. Evaluation of model coefficients using direct numerical simulation (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 3233-3239 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The modeling of the turbulent diffusion of quantities such as the turbulent kinetic energy and its dissipation rate in the outer part of wall-bounded flows is examined with the aid of simulation data. The channel-flow data of Mansour et al. [J. Fluid Mech. 194, 15 (1988)] and those of Spalart [J. Fluid Mech. 187, 61 (1988)] for a flat-plate boundary layer with zero pressure gradient are used to examine the differences between turbulent flows with and without a free-stream edge. The ratio of the diffusivity of the above-mentioned turbulent quantities to the diffusivity of momentum is roughly constant, as assumed in most models, and little affected by the presence of the free-stream edge. However, the diffusivity ratios are found to deviate significantly from so-called "standard'' values. Furthermore, current models for the momentum diffusivity fail badly at the edge of the boundary layer: the modeling constant Cμ used in the (k,ε) and related models exhibits a rapid rise there. In this respect, the simulation data confirm earlier experimental studies. The consequences of these findings for turbulence modeling are briefly examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858680
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  • 8
    Electronic Resource
    Electronic Resource
    Possible origin of Prandt's mixing-length theory (1974)
    [s.l.] : Nature Publishing Group
    Nature 249 (1974), S. 135-136 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Later work (ref. 4, and see ref. 5 for a summary) has shown that the formula for the mixing-length can be derived, using dimensional analysis, by assuming 'local equilibrium' between the turbulence and the mean flow. The only known example of a region of local equilibrium is the wall layer with I = ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/249135b0
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  • 9
    Electronic Resource
    Electronic Resource
    A crossed hot-wire technique for complex turbulent flows (1991)
    Springer
    Experiments in fluids 12 (1991), S. 17-22 
    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 describes a crossed hot-wire technique for the measurement of all components of mean velocity, Reynolds stresses, and triple products in a complex turbulent flow. The accuracy of various assumptions usually implicit in the use of crossed hot-wire anemometers is examined. It is shown that significant errors can result in flow with gradients in mean velocity or Reynolds stress, but that a first order correction for these errors can be made using available data. It is also shown how corrections can be made for high turbulence levels using available data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226561
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  • 10
    Electronic Resource
    Electronic Resource
    Decay of spanwise wavy inhomogeneities in a three-dimensional turbulent boundary layer over an “infinite” swept concave wing (1988)
    Springer
    Experiments in fluids 6 (1988), S. 487-492 
    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 Measurements have been made in a three-dimensional turbulent boundary layer over a concave surface, whose generators were swept at 35 ° (simulating an “infinite” swept wing). The results show that the quasi-periodic spanwise variations of skin friction, reported in two-dimensional concave wall turbulent boundary layers, decay in the presence of a cross flow. Skin friction surveys in a companion experiment with an “infinite” swept concave surface of variable sweep show that there exists a critical sweep angle below which the disturbances grow, and above which they decay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196510
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