Non-Gaussianity in turbulent pair dispersion etc15 Tracking Number 156Presentation: Session: Lagrangian aspects of turbulence 1 Room: Room F Session start: 10:30 Wed 26 Aug 2015 Benjamin Devenish ben.devenish@metoffice.gov.uk Affifliation: Met Office David Thomson david.thomson@metoffice.gov.uk Affifliation: Met Office Topics: - Transport and mixing, - Lagrangian aspects of turbulence 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. |