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  • Digitale Medien  (11)
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  • Digitale Medien  (11)
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  • 1
    Digitale Medien
    Digitale Medien
    A spectrum model for weakly anisotropic turbulence (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1500-1502 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A simple model, parametrized by the Reynolds stress anisotropy, is proposed for the spectrum of weakly anisotropic turbulence. It contains a model constant that affects its region of realizability. This spectrum model is used to derive a one point closure to the rapid pressure-strain term. The derived pressure-strain model is linear in the Reynolds stress anisotropy and is of the same form as the closure model of Launder, Reece, and Rodi (LRR) [J. Fluid Mech. 68, 537 (1975)]. The spectrum model becomes unrealizable in some regions of wave space for sufficiently large anisotropy of the Reynolds stress, and this is used to infer the region of validity of the linear closure model. It is found that the extent of the valid region is very small when the model constant is set to match rapid distortion theory, and largest for a model constant set close to the value suggested by LRR. However, even the largest valid domain does not extend very far from isotropy, suggesting inherent weakness in the linear pressure-strain models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.857600
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  • 2
    Digitale Medien
    Digitale Medien
    The effects of rotation on initially anisotropic homogeneous flows (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2421-2425 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Rotation of initially anisotropic homogeneous flows is studied using a model spectral tensor. It is shown that the anisotropy changes because of the influence of rotation through phase scrambling. Phase scrambling causes the Reynolds stresses to develop with damped oscillations. The final Reynolds stress anisotropy is found to be proportional to the initial structural tensor anisotropy. Closure models for the rapid pressure strain terms should reflect this change in anisotropy, and should drive the anisotropy to reach its final predicted state. Finally, it is shown that long-time integration using direct numerical simulations should be treated with care because phase scrambling effects on a discrete wave space can cause loss of resolution when time becomes large.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.858180
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  • 3
    Digitale Medien
    Digitale Medien
    Useful formulas in the rapid distortion theory of homogeneous turbulence (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 3471-3474 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Rapid distortion theory is applied to study the response of homogeneous turbulence to imposed arbitrary irrotational mean strains. Expressions useful in turbulence modeling, such as the Reynolds stresses and vorticity correlations, have been obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.865813
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  • 4
    Digitale Medien
    Digitale Medien
    The Positive Electrical Drift in the Air (1925)
    [s.l.] : Nature Publishing Group
    Nature 115 (1925), S. 836-837 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] THE only reason advanced by Dr. Chree (NATURE, April 11, p. 531) in support of his contention that smoke is responsible for atmospheric electricity in towns, is the fact that atmospheric pollution is worst when the potential gradient is abnormally high. The conditions under which ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/115836a0
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  • 5
    Digitale Medien
    Digitale Medien
    Thunderstorms and Ozone (1923)
    [s.l.] : Nature Publishing Group
    Nature 112 (1923), S. 396-397 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] THE question—What chemical changes, if any, are associated with atmospheric electrical discharges ?—does not appear hitherto to have received a definite answer. Nitrogen peroxide and ozone are both referred to in scientific literature, although neither appears to have been satisfactorily ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/112396b0
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  • 6
    Digitale Medien
    Digitale Medien
    Charged Aerosols and Ball Lightning. (1931)
    [s.l.] : Nature Publishing Group
    Nature 128 (1931), S. 584-584 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] MESSRS. Cawood and Patterson conclude their extremely interesting account of the behaviour of electrified aerosols with the comment:1 “The existence of such a spherical highly charged assemblage of particles suggests that globular lightning may owe its origin to an analogous ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/128584b0
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  • 7
    Digitale Medien
    Digitale Medien
    The Positive Electrical Drift in the Air (1925)
    [s.l.] : Nature Publishing Group
    Nature 115 (1925), S. 531-531 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IF electrostatic measurements are made in the air on a bridge over the permanent way near any railway station, extraordinarily large positive charges given off by steam locomotives will be observed, especially on starting up. These positive charges are carried by the wind for long distances. ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/115531a0
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  • 8
    Digitale Medien
    Digitale Medien
    Globular Lightning (1923)
    [s.l.] : Nature Publishing Group
    Nature 112 (1923), S. 903-903 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] YOUR correspondent, Mr. E. Kilburn Scott, suggests in NATURE of November 24, p. 760, that “the ball may be a mass of concentrated nitrogen oxides,” and considers that this would “fit in well with the formation and action of such gases,” and he compares the chemical activity of lightning with ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/112903b0
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  • 9
    Digitale Medien
    Digitale Medien
    The Distribution of the Two Electrical Zones in the Atmosphere (1925)
    [s.l.] : Nature Publishing Group
    Nature 116 (1925), S. 394-395 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] I HAVE examined the fair weather potential gradient on several mountains in the Bernese Oberland, and find that the positive zone, in summer at midday, extends from sea-level to above the Jungfrau (13,671 ft.). When observations at greater heights are available it may be found that it reaches ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/116394a0
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  • 10
    Digitale Medien
    Digitale Medien
    A Concentration and Measurement of Atmospheric Ozone (1938)
    [s.l.] : Nature Publishing Group
    Nature 142 (1938), S. 571-571 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Prof. F. A. Paneth and Mr. J. L. Edgar are to be congratulated on having devised a new and ingenious chemical method of measuring both the ozone and nitrogen peroxide in the London atmosphere1. It is interesting to note that their measurements agree with those which I ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/142571a0
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