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Second-order velocity structure functions in direct numerical simulations of turbulence with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>R</mml:mi><mml:mi>λ</mml:mi></mml:msub></mml:math> up to 2250
https://nied-repo.bosai.go.jp/records/6383
https://nied-repo.bosai.go.jp/records/63831efba8e3-7053-4669-89e5-48954a5c7602
| Item type | researchmap(1) | |||||||||||||||||||||||||
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| 公開日 | 2023-09-20 | |||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||
| 言語 | ja | |||||||||||||||||||||||||
| タイトル | Second-order velocity structure functions in direct numerical simulations of turbulence with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>R</mml:mi><mml:mi>λ</mml:mi></mml:msub></mml:math> up to 2250 | |||||||||||||||||||||||||
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| 言語 | en | |||||||||||||||||||||||||
| タイトル | Second-order velocity structure functions in direct numerical simulations of turbulence with R-lambda up to 2250 | |||||||||||||||||||||||||
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| 言語 | eng | |||||||||||||||||||||||||
| 著者 |
Takashi Ishihara
× Takashi Ishihara
× Yukio Kaneda
× Koji Morishita
× Mitsuo Yokokawa
× Atsuya Uno
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| 抄録 | ||||||||||||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||||||||||||
| 内容記述 | We report results of a series of high-resolution direct numerical simulations (DNSs) of forced incompressible isotropic turbulence with the number of grid points and the Taylor scale Reynolds number R-lambda up to 12 288(3) and similar to 2250, respectively. The DNSs show that there exists a scaling range (approximately 100 < r/eta < 400), at which the second-order two-point velocity structure functions S-2 (r) fit well with a simple power-law, S-2 (r)1(<epsilon > r)(2/3) = C-2 (r/L-0)(zeta), where r is the distance between the two points, eta is the Kolmogorov length scale, <epsilon > is the mean rate of energy dissipation per unit mass, and L-0 is the integral length scale. The exponent is constant independent from R. However, the coefficient C-2 is dependent of R-lambda or the viscosity. This implies that the power-law scaling range of 100 < r/lambda < 400 for R-lambda up to similar to 2250 is not the so-called "inertial subrange" in the sense that the statistics in the range are independent from the viscosity, as assumed in various turbulence theories. This suggests that the constancy of the scaling exponent of a structure function within a certain range does not necessarily mean that the exponent is the scaling exponent in "the inertial subrange." | |||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||
| 書誌情報 |
ja : Physical Review Fluids en : PHYSICAL REVIEW FLUIDS 巻 5, 号 10, 発行日 2020-10-27 |
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| 言語 | ja | |||||||||||||||||||||||||
| 出版者 | American Physical Society (APS) | |||||||||||||||||||||||||
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| 言語 | en | |||||||||||||||||||||||||
| 出版者 | AMER PHYSICAL SOC | |||||||||||||||||||||||||
| ISSN | ||||||||||||||||||||||||||
| 収録物識別子タイプ | EISSN | |||||||||||||||||||||||||
| 収録物識別子 | 2469-990X | |||||||||||||||||||||||||
| DOI | ||||||||||||||||||||||||||
| 関連識別子 | 10.1103/physrevfluids.5.104608 | |||||||||||||||||||||||||
