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11:00
15 mins
Non-Gaussianity in turbulent pair dispersion
Benjamin Devenish, David Thomson
Session: Lagrangian aspects of turbulence 1
Session starts: Wednesday 26 August, 10:30
Presentation starts: 11:00
Room: Room F
Benjamin Devenish (Met Office)
David Thomson (Met Office)
Abstract:
We consider an extension of Thomson's (JFM, 1990) two-particle
Lagrangian stochastic model that is constructed to be consistent
with the 4/5 law of turbulence. It is shown that one effect of
non-zero skewness in the longitudinal relative velocity is to reduce
the value of Richardson's constant by approximately a factor
of two relative to the model with zero skewness and that this
value is close to recent measurements from direct numerical simulation
of homogeneous isotropic turbulence.