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• W2149762435 abstract "This paper presents an analysis of flow properties in the proximity of the turbulent/non-turbulent interface (TNTI), with particular focus on the acceleration of fluid particles, pressure and related small scale quantities such as enstrophy, ω 2 = ω i ω i , and strain, s 2 = s ij s ij . The emphasis is on the qualitative differences between turbulent, intermediate and non-turbulent flow regions, emanating from the solenoidal nature of the turbulent region, the irrotational character of the non-turbulent region and the mixed nature of the intermediate region in between. The results are obtained from a particle tracking experiment and direct numerical simulations (DNS) of a temporally developing flow without mean shear. The analysis reveals that turbulence influences its neighbouring ambient flow in three different ways depending on the distance to the TNTI: (i) pressure has the longest range of influence into the ambient region and in the far region non-local effects dominate. This is felt on the level of velocity as irrotational fluctuations, on the level of acceleration as local change of velocity due to pressure gradients, D u /D t ≃ ∂ u /∂ t ≃ −∇ p /ρ, and, finally, on the level of strain due to pressure-Hessian/strain interaction, (D/D t )( s 2 /2) ≃ (∂/∂ t )( s 2 /2) ≃ − s ij p , ij > 0; (ii) at intermediate distances convective terms (both for acceleration and strain) as well as strain production − s ij s jk s ki > 0 start to set in. Comparison of the results at Taylor-based Reynolds numbers Re λ = 50 and Re λ = 110 suggests that the distances to the far or intermediate regions scale with the Taylor microscale λ or the Kolmogorov length scale η of the flow, rather than with an integral length scale; (iii) in the close proximity of the TNTI the velocity field loses its purely irrotational character as viscous effects lead to a sharp increase of enstrophy and enstrophy-related terms. Convective terms show a positive peak reflecting previous findings that in the laboratory frame of reference the interface moves locally with a velocity comparable to the fluid velocity fluctuations." @default.
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• W2149762435 date "2009-10-23" @default.
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• W2149762435 title "Acceleration, pressure and related quantities in the proximity of the turbulent/non-turbulent interface" @default.
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• W2149762435 doi "https://doi.org/10.1017/s0022112009991522" @default.
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