Statistics – Computation
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3705302s&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 5, CiteID L05302
Statistics
Computation
4
Volcanology: Volcanoclastic Deposits, Nonlinear Geophysics: Turbulence (3379, 4568, 7863), Computational Geophysics: Modeling (1952, 4255)
Scientific paper
Entrainment of air by turbulent mixing plays a central role in the dynamics of eruption clouds; the amount of entrained air controls eruption styles and heights of eruption columns. The efficiency of entrainment is quantified by the entrainment coefficient: the ratio between mean inward radial velocity at the edge and the mean vertical velocity. We directly determined the entrainment coefficient of eruption columns as a function of height on the basis of three-dimensional numerical simulations. The value of entrainment coefficient is similar to that for pure jets (˜0.07) just above the vent, and approaches that for pure plumes (0.10-0.15) far from the vent. Between these two regions, we identify a new transitional zone with a significantly small entrainment coefficient (˜0.05). This spatial variation in the entrainment coefficient is correlated with the change in vortical structure accompanying the addition of off-source buoyancy in the transitional zone.
Koyaguchi Takehiro
Suzuki Y. J.
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