Abstract
In this contribution we analyze properties of the turbulent/nonturbulent interface (TNTI) in a flow without mean shear. The approach is numerical and based on a Direct Numerical Simulation (DNS). For the final paper the results will be complemented with Particle Tracking Velocimetry measurements. The focus is on the ‘local’ entrainment velocity, vn, defined as the velocity of the TNTI relative to the fluid and directed towards the irrotational ambient. We provide an expression for vn that consists of two parts: a viscous and an inviscid one. The results show that the viscous contribution is stronger than the inviscid part and governs the local entrainment velocity towards the ambient. We also propose a measure to characterize the characteristic length scale or ‘thickness’ of the TNTI.
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