Record Details

Power law of decaying homogeneous isotropic turbulence at low Reynolds number

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Power law of decaying homogeneous isotropic turbulence at low Reynolds number
 
Creator BURATTINI, P
LAVOIE, P
AGRAWAL, A
DJENIDI, L
ANTONIA, RA
 
Subject grid-generated turbulence
lattice boltzmann method
direct numerical simulations
energy-dissipation rate
boundary-conditions
passive scalar
velocity-field
statistics
similarity
pressure
 
Description We focus on an estimate of the decay exponent (m) in the initial period of decay of homogeneous isotropic turbulence at low Taylor microscale Reynolds number R-lambda (similar or equal to 20-50). Lattice Boltzmann simulations in a periodic box of 256(3) points are performed and compared with measurements in grid turbulence at similar R-lambda. Good agreement is found between measured and calculated energy spectra. The exponent m is estimated in three different ways: from the decay of the turbulent kinetic energy, the decay of the mean energy dissipation rate, and the rate of growth of the Taylor microscale. Although all estimates are close, as prescribed by theory, that from the Taylor microscale has the largest variability. It is then suggested that the virtual origin for the decay rate be determined from the Taylor microscale, but the actual value of m be estimated from the decay rate of the kinetic energy. The dependence of m on R-lambda(0) (the value of R-lambda at the beginning of the simulation) is also analyzed, using the present data as well as data from the literature. The results confirmed that m approaches 1, as R-lambda(0) increases.
 
Publisher AMERICAN PHYSICAL SOC
 
Date 2011-07-17T18:25:13Z
2011-12-26T12:50:26Z
2011-12-27T05:35:06Z
2011-07-17T18:25:13Z
2011-12-26T12:50:26Z
2011-12-27T05:35:06Z
2006
 
Type Article
 
Identifier PHYSICAL REVIEW E, 73(6), -
1539-3755
http://dx.doi.org/10.1103/PhysRevE.73.066304
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4805
http://hdl.handle.net/10054/4805
 
Language en