1. Turbulence characteristics of high Reynolds number flow inside a three-dimensional cubic lid-driven cavity.
- Author
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Samantaray, Debabrat, Das, Manab Kumar, and Patel, Devendra Kumar
- Subjects
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REYNOLDS number , *THREE-dimensional flow , *PROBABILITY density function , *TURBULENCE , *DISTRIBUTION (Probability theory) , *INCOMPRESSIBLE flow - Abstract
Large eddy simulation (LES) with dynamic Smagorinsky model (DSM) has been implemented to elicit the turbulence characteristic of the flow inside a cubic lid-driven cavity at Reynolds number of 10000. The coherent organized structures tear, pair and disintegrate leading to the evolution of turbulence. They are reflected in the RMS (root mean square) plots of the turbulent fluctuations in different planes. The flow has a near zero helicity value; unlike the other two velocity component, the probability density function of span wise velocity component shows the flow symmetry on the both side of the mid plane in span wise direction; kurtosis being largely leptokurtic except near wall locations indicates their peakedness. The quadrant analysis shows presence of more coherent structures near the down stream wall and the joint probability distribution function shows that turbulence is anisotropic. Power spectra is observed to follow the − 5 ∕ 3 law. Both Taylor microscale λ and Kolmogorov length scale η show greater near-wall dissipation • Large eddy simulation of cubic lid-driven cavity flow has been performed at Re =10000. • Q- criterion shows the coherent organized structures tear, pair and disintegrate leading to the evolution of turbulence. • The Fourier spectra of auto correlation shows a slope of − 5 ∕ 3 in the sub inertial range. • The probability density function of span wise velocity component on the symmetrical mid plane shows the flow maintains symmetry even at high Reynolds number and has very low skewness value. Kurtosis is mostly leptokurti except near wall location. • Joint probability density function shows the turbulent fluctuations distribution is anisotropic. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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