Influence of coherent vortex structures in subgrid scale motions on particle statistics in homogeneous isotropic turbulence

2019 ◽  
Vol 113 ◽  
pp. 358-370
Author(s):  
Yan Xiong ◽  
Jing Li ◽  
Fei Fei ◽  
Zhaohui Liu ◽  
Wei Luo
Keyword(s):  
Isotropic Turbulence ◽  
Vortex Structures ◽  
Subgrid Scale ◽  
Homogeneous Isotropic Turbulence ◽  
Coherent Vortex ◽  
Particle Statistics

scholarly journals Divergence-free Wavelets for Coherent Vortex Extraction in 3D homogeneous isotropic turbulence

2007 ◽  
Vol 16 ◽  
pp. 146-163 ◽  
Author(s):  
Erwan Deriaz ◽  
Margarete O. Domingues ◽  
Valérie Perrier ◽  
Kai Schneider ◽  
Marie Farge
Keyword(s):  
Isotropic Turbulence ◽  
Homogeneous Isotropic Turbulence ◽  
Coherent Vortex ◽  
Divergence Free

scholarly journals Comparative Study of the Grid-Scale and Subgrid-Scale Velocity Fields - A Priori Test

1970 ◽  
Vol 30 ◽  
pp. 19-31
Author(s):  
M Ashraf Uddin ◽  
M Matiar Rahman ◽  
M Saiful Islam Mallik
Keyword(s):  
Isotropic Turbulence ◽  
A Priori ◽  
Velocity Fields ◽  
Subgrid Scale ◽  
Homogeneous Isotropic Turbulence ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Spatial Spectra ◽  
Sharp Cutoff ◽  
Better Than

Generation of grid-scale (GS) and subgrid-scale (SGS) velocity fields is performed by direct filtering of DNS (Direct Numerical Simulation) data at a low Reynolds number in homogeneous isotropic turbulence in order to assess the spectral accuracy as well as the performance of filter functions for LES (Large Eddy Simulation). The filtering is performed using three classical filter functions: Gaussian, Tophat and Sharp cutoff filters and in all three cases the results are compared with three different filter widths for LES. Comparing the distributions of GS and SGS velocities, and the decay of turbulence with those from DNS fields through out the whole calculation we have found that among the three filter functions, the performance of Sharp cutoff filter is better than that of the other two filter functions in terms of both spatial spectra and the distribution of velocities. Furthermore, it is shown that the accuracy of the filtering approach does not depend only on the filter functions but also on the filter widths for LES. GANIT J. Bangladesh Math. Soc. (ISSN 1606-3694) 30 (2010) 19-31   DOI: http://dx.doi.org/10.3329/ganit.v30i0.8499

A comparative study of subgrid scale models in homogeneous isotropic turbulence

1997 ◽  
Vol 9 (5) ◽  
pp. 1416-1429 ◽  
Author(s):  
C. Fureby ◽  
G. Tabor ◽  
H. G. Weller ◽  
A. D. Gosman
Keyword(s):  
Comparative Study ◽  
Isotropic Turbulence ◽  
Subgrid Scale ◽  
Homogeneous Isotropic Turbulence ◽  
Scale Models

Intermittent vortex structures in homogeneous isotropic turbulence

Nature ◽  
1990 ◽  
Vol 344 (6263) ◽  
pp. 226-228 ◽  
Author(s):  
Zhen-Su She ◽  
Eric Jackson ◽  
Steven A. Orszag
Keyword(s):  
Isotropic Turbulence ◽  
Vortex Structures ◽  
Homogeneous Isotropic Turbulence

DNS study of decaying homogeneous isotropic turbulence with polymer additives

2010 ◽  
Vol 665 ◽  
pp. 334-356 ◽  
Author(s):  
W.-H. CAI ◽  
F.-C. LI ◽  
H.-N. ZHANG
Keyword(s):  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Newtonian Fluid ◽  
Isotropic Turbulence ◽  
Transport Equations ◽  
Vortex Structures ◽  
Small Scale ◽  
Polymer Additives ◽  
Homogeneous Isotropic Turbulence ◽  
Turbulent Drag

In order to investigate the turbulent drag reduction phenomenon and understand its mechanism, direct numerical simulation (DNS) was carried out on decaying homogeneous isotropic turbulence (DHIT) with and without polymer additives. We explored the polymer effect on DHIT from the energetic viewpoint, i.e. the decay of the total turbulent kinetic energy and energy distribution at each scale in Fourier space and from the phenomenological viewpoint, i.e. the alterations of vortex structures, the enstrophy and the strain. It was obtained that in DHIT with polymer additives the decay of the turbulent kinetic energy is faster than that in the Newtonian fluid case and a modification of the turbulent kinetic energy transfer process for the Newtonian fluid flow is observed due to the release of the polymer elastic energy into flow structures at certain small scales. Besides, we deduced the transport equations of the enstrophy and the strain, respectively, for DHIT with polymer additives. Based on the analyses of these transport equations, it was found that polymer additives depress both the enstrophy and the strain in DHIT as compared to the Newtonian fluid case, indicating the inhibition effect on small-scale vortex structures and turbulence intensity by polymers.

scholarly journals Coherent vortex extraction in 3D homogeneous isotropic turbulence using orthogonal wavelets

2007 ◽  
Vol 16 ◽  
pp. 164-180
Author(s):  
Margarete O. Domingues ◽  
Ingmar Broemstrup ◽  
Kai Schneider ◽  
Marie Farge ◽  
Benjamin Kadoch
Keyword(s):  
Isotropic Turbulence ◽  
Homogeneous Isotropic Turbulence ◽  
Orthogonal Wavelets ◽  
Coherent Vortex
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