Huang, MeiJiau and Leonard, Anthony (1995) Velocity autocorrelations of decaying isotropic homogeneous turbulence. Physics of Fluids, 7 (10). pp. 24552464. ISSN 10706631. http://resolver.caltech.edu/CaltechAUTHORS:HUApof95

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Abstract
Velocity autocorrelations and the meansquare displacements of fluid particles are obtained for decaying, isotropic homogeneous turbulence by numerical simulation of the flow field, using 1283 and 2563 grids, and tracking several tens of thousands of fluid particles, using a thirdorder interpolation scheme. A selfpreserving Lagrangian velocity autocorrelation coefficient is found in terms of a dimensionless time variable s, defined by ds=dt/[script T]s(t), under the observation of a powerlaw energy decay and the assumption that [script T]s(t) is proportional to the Lagrangian integral timescale [script T]<sub>[script L]</sub>. This timescale is in turn assumed to be proportional to the length scale of the energycontaining eddies [script L]e~K3/2/epsilon divided by the turbulent velocity u[prime], where K=3/2u[prime]2 is turbulent energy and epsilon is the energy dissipation rate.
Item Type:  Article 

Additional Information:  ©1995 American Institute of Physics. Received 28 December 1994; accepted 12 June 1995. We thank Dr. Robert Rogallo for his generosity for providing the basic program for the simulations. This research was performed in part using the Intel Touchstone Delta System operated by Caltech on behalf of the Concurrent Supercomputing Consortium, and supported by the U.S. Air Force Office of Scientific Research under Grant No. AFOSR910241. 
Group:  GALCIT 
Subject Keywords:  COMPUTERIZED SIMULATION, ENERGY LOSSES, TRAJECTORIES, TURBULENT FLOW, VISCOUS FLOW, AUTOCORRELATIONS, EDDY DIFFUSION 
Record Number:  CaltechAUTHORS:HUApof95 
Persistent URL:  http://resolver.caltech.edu/CaltechAUTHORS:HUApof95 
Alternative URL:  http://dx.doi.org/10.1063/1.868780 
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ID Code:  10913 
Collection:  CaltechAUTHORS 
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Deposited On:  16 Jun 2008 
Last Modified:  20 Sep 2016 20:54 
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