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First Edition Preface Second Edition Preface Acknowledgments
Section S S index 411-419 of 1376 terms
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similarity relationship—The formula relating dimensionless groups in similarity theory. While Buckingham Pi theory allows one to identify which dimensionless groups of variables might be relevant to a particular flow situation, it does not give a formula relating these groups. Such a formula is found empirically.
similarity theory of turbulence—See Kolmogorov's similarity hypotheses.
similarity theory—An empirical method of finding universal relationships between variables that are made dimensionless using appropriate scaling factors. The dimensionless groups of variables are called Pi groups and are found using a dimensional analysis method known as Buckingham Pi theory. Similarity methods have proved very useful in the atmospheric boundary layer, where the complexity of turbulent processes precludes direct solution of the exact governing equations. See mixed-layer similarity, local free-convection similarity, local similarity.
Stull, R. B., 1988: An Introduction to Boundary Layer Meteorology, 666 pp.
similarity—(Also called similitude.) See dynamic similarity.
simm—Same as simoom.
simoom—(Many variant spellings.) A strong, dry, dust-laden desert wind that blows in the Sahara, Palestine, Jordan, Syria, and the desert of Arabia. Its temperature may exceed 54°C and the humidity may fall below 10%. The name means “poison wind” and is given because the sudden onset of a simoom may cause heat stroke. This is attributed to the fact that the hot wind brings more heat to the body than can be disposed of by the evaporation of perspiration.
simple average—Same as arithmetic mean.
simple harmonic wave—An oscillation translating with constant speed and amplitude, and represented mathematically by a trigonometric or complex exponential function. Thus, or represents a simple harmonic wave of amplitude A, wavelength λ, frequency ν, and phase angle φ. In ocean wave studies, a simple harmonic progressive wave is an idealized wave characterized by constant speed of propagation and a straight crest of indefinite length. See also wavenumber, phase speed.
simple linear correlation—See correlation.
simple reflector—Same as specular reflector.
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