scholarly journals Direct tensor filter method for synthetic turbulent field generation

2021 ◽  
pp. 1-15
Author(s):  
Anatoly Vitalievich Alexandrov ◽  
Ludwig Waclawovich Dorodnicyn
Keyword(s):  
Velocity Fields ◽  
Turbulent Velocity ◽  
Filter Method ◽  
Field Generation ◽  
Turbulent Field ◽  
Anisotropic Filter

A Direct Tensor Filter Method for synthetic turbulent field generation is proposed in this paper. The method is a generalization of the Direct Anisotropic Filter Method. The turbulent velocity fields built on the base of this method provides more properties corresponding to real physical turbulent fields in comparison to ones obtained with help of DAF method.

Measurements of Local Scaling of Turbulent Velocity Fields at High Reynolds Numbers

1992 ◽  
pp. 443-461
Author(s):  
G. M. Zaslavsky ◽  
A. A. Chernikov ◽  
A. A. Praskovsky ◽  
M. Yu. Karyakin ◽  
D. A. Usikov
Keyword(s):  
Reynolds Numbers ◽  
Velocity Fields ◽  
Turbulent Velocity ◽  
Local Scaling ◽  
High Reynolds Numbers ◽  
High Reynolds

Spatio-Temporal Analysis of Photospheric Turbulent Velocity Fields Using the Proper Orthogonal Decomposition

Solar Physics ◽  
2008 ◽  
Vol 251 (1-2) ◽  
pp. 163-178 ◽  
Author(s):  
A. Vecchio ◽  
V. Carbone ◽  
F. Lepreti ◽  
L. Primavera ◽  
L. Sorriso-Valvo ◽  
...  
Keyword(s):  
Proper Orthogonal Decomposition ◽  
Temporal Analysis ◽  
Velocity Fields ◽  
Orthogonal Decomposition ◽  
Turbulent Velocity ◽  
Spatio Temporal ◽  
Proper Orthogonal

A comparative study of turbulent velocity fields in an internal combustion engine with shrouded valve and flat/bowl piston configurations

2007 ◽  
Vol 221 (12) ◽  
pp. 1597-1607 ◽  
Author(s):  
A Erdil ◽  
A Kodal
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Engine Performance ◽  
Internal Combustion ◽  
Velocity Fields ◽  
Turbulent Velocity ◽  
Energy Spectra ◽  
Hot Wire ◽  
Phase Average ◽  
Proper Orthogonal

In the current study, the phase averaging and the proper orthogonal decomposition (POD) methods are used to decompose experimentally measured turbulent velocity fields in an internal combustion engine. Radial and circumferential turbulent velocity fields were measured using hot wire anemometer under motoring conditions for both flat and bowl piston configurations. Decomposed results of the phase average and POD methods are compared with each other. The effects of piston configuration on the engine performance have been discussed. Also, obtained organized and turbulence motions and their energy spectra are examined. Finally, coherent structures of velocity fields and their activities are investigated.

Tests of subgrid models in the near-wall region using represented velocity fields

1983 ◽  
Vol 132 ◽  
pp. 349-373 ◽  
Author(s):  
Y. Kaneda ◽  
D. C. Leslie
Keyword(s):  
Boundary Condition ◽  
Velocity Fields ◽  
Large Eddy Simulations ◽  
Wall Region ◽  
Dimensional Model ◽  
Positive Side ◽  
Turbulent Field ◽  
Large Eddy ◽  
Near Wall

The 2.5-dimensional model of the turbulent field near a wall, proposed by Hatziavramidis & Hanratty (1979) and modified by Chapman & Kuhn (1981), has been used to test the subgrid models of Schumann (1973, 1975) and Moin & Kim (1982). The results are disquieting, both trends and orders of magnitude sometimes being seriously in error. It also appears that the contribution of the subgrid energy to the pseudopressure calculated in large-eddy simulations can be large, although this contribution is usually neglected. On the positive side, Leonard's model for the Leonard stress is extremely good, and Schumann's synthetic boundary condition is also found to be reliable.These results must be taken with a grain of salt, since the tests reported in §5 show that the 2.5-dimensional model cannot reproduce important characteristics of the turbulence in the neighbourhood of y+ = 40.

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