TY - GEN
T1 - DNS on multiscale-generated grid turbulence using a classical grid
AU - Suzuki, Hiroki
AU - Nagata, Kouji
AU - Sakai, Yasuhiko
AU - Hayase, Toshiyuki
AU - Hasegawa, Yutaka
AU - Ushijima, Tatsuo
N1 - Funding Information:
Part of this study was carried out under the Collaborative Research Project of the Institute of Fluid Science, Tohoku University. A portion of this study was supported by Grants-in-Aid (Nos. 22360076, 22360077, 24760133, 25289030, and 25289031) from the Japanese Ministry of Education, Culture, Sports, Science and Technology.
PY - 2013
Y1 - 2013
N2 - We carry out direct numerical simulation of experimental grid turbulence, for which the mesh Reynolds number is 2500. The grid is directly constructed in the computational domain. The streamwise computational domain size is >100 times the mesh size. The value of the decay exponent n is estimated as n ≈ 1.36 by using a ratio defined by the turbulent kinetic energy and its dissipation. The prevailing perspective is that the memory of the turbulence cannot be considered as short. In this paper, we propose a promoter that focuses on the generation of turbulence using the grid, not on the shape of the grid, as addressed in previous studies (Hurst & Vassilicos (2007); Krogstad & Davidson (2011)), from a multiscale perspective and investigate the effects of the turbulence-generating method on the decay exponent n. Specifically, n is increased to n ≈ 1.53 and 1.41 because of the changes in the initial conditions.
AB - We carry out direct numerical simulation of experimental grid turbulence, for which the mesh Reynolds number is 2500. The grid is directly constructed in the computational domain. The streamwise computational domain size is >100 times the mesh size. The value of the decay exponent n is estimated as n ≈ 1.36 by using a ratio defined by the turbulent kinetic energy and its dissipation. The prevailing perspective is that the memory of the turbulence cannot be considered as short. In this paper, we propose a promoter that focuses on the generation of turbulence using the grid, not on the shape of the grid, as addressed in previous studies (Hurst & Vassilicos (2007); Krogstad & Davidson (2011)), from a multiscale perspective and investigate the effects of the turbulence-generating method on the decay exponent n. Specifically, n is increased to n ≈ 1.53 and 1.41 because of the changes in the initial conditions.
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M3 - Conference contribution
AN - SCOPUS:85034117778
T3 - International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
BT - International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
PB - TSFP-8
T2 - 8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
Y2 - 28 August 2013 through 30 August 2013
ER -