Helical structures in a temporally developing round jet in the developed state

Takahashi, Mamoru; Fukui, Ren; Tsujimoto, Koichi; Ando, Toshitake; Shakouchi, Toshihiko

doi:10.1007/s10494-023-00423-4

Flow Turbulence Combust

2023

DOI: 10.1007/s10494-023-00423-4

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Helical structures in a temporally developing round jet in the developed state

Mamoru Takahashi

Ren Fukui

Koichi Tsujimoto

et al.

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Cited by 3 publications

References 41 publications

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Local geometry of a weak normal shock wave interacting with turbulence

Kusuhata,

Tanaka,

Watanabe

et al. 2023

Physics of Fluids

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The shock surface geometry is investigated with direct numerical simulations of a weak normal shock wave propagating in turbulence. The geometry is quantified with the principal curvatures of the surface. A large part of the surface has an approximately flat saddle shape, while elliptic concave and convex shapes with a large curvature intermittently appear on the shock surface. The pressure–dilatation correlation in the governing equation of pressure is investigated at the shock wave with the decomposition into three terms associated with the velocity gradients in the two directions of the principal curvatures and the normal direction of the shock wave. Fluid expansion in the tangential direction occurs at the shock wave with a convex shape in the direction of the shock propagation, resulting in a smaller pressure jump across the shock wave. For a concave shape, compression in the tangential direction can amplify the pressure jump. Consistently, small and large shock Mach numbers are observed for convex and concave shapes, respectively. The geometric influences are the most significant for elliptic concave and convex shapes with approximately equal curvatures in the two principal directions because the compression or expansion occurs in all tangential directions. These relations between the shock surface geometry and shock Mach number observed in turbulence are consistent with the theory of deformed shock waves, suggesting that the three-dimensional geometrical features of the shock surface are important in the modulation of shock waves due to turbulence.

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Local geometry of a weak normal shock wave interacting with turbulence

Kusuhata,

Tanaka,

Watanabe

et al. 2023

Physics of Fluids

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Statistical properties of shear and nonshear velocity components in isotropic turbulence and turbulent jets

Enoki,

Watanabe,

Nagata

2023

Phys. Rev. Fluids

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Diffusion performance of lobed jet in the developed states consistent across temporally and spatially developing flows

Takahashi,

Fukui,

Tsujimoto

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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This study demonstrates that temporally developing lobed jets can qualitatively reproduce the diffusion performance in the fully developed states of spatially developing lobed jets in laboratory experiments. The jet exit geometries, Reynolds number [Formula: see text], and turbulence intensity (3% of mean velocity) were set to be the same across the temporally and spatially developing jets. Four types of jet flows were tested, one being a round jet and three being lobed jets with different numbers or curvatures of lobes, referred to as 6L, 6S, and 3L, respectively. The half-width of the mean streamwise velocity distributions and centerline mean streamwise velocity of the four jets in the developed states were consistent between the numerical simulations and experiments. The round jet displayed the highest diffusion performance, followed by 3L, while 6L and 6S were the smallest and were comparable with each other. Despite such consistency in the developed states, the diffusion performance and formation of the streamwise swirling flows did not agree between the numerical and experimental results. These results suggest that unique large-scale structures corresponding to the initial conditions are reproduced in temporally developing jets, which is in good agreement with the spatially developing lobed jets. Therefore, the current study demonstrated that the temporally developing simulations can reproduce similar diffusion processes to those of the spatially developing ones.

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Helical structures in a temporally developing round jet in the developed state

Cited by 3 publications

References 41 publications

Local geometry of a weak normal shock wave interacting with turbulence

Local geometry of a weak normal shock wave interacting with turbulence

Statistical properties of shear and nonshear velocity components in isotropic turbulence and turbulent jets

Diffusion performance of lobed jet in the developed states consistent across temporally and spatially developing flows

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