Losing the shock wave front profile due to interaction with turbulence

Fukushima, Gaku; Wei, Jinchi; Ogawa, Shingo; Hagiwara, Jun; Nakamura, Yusuke; Sasoh, Akihiro

doi:10.1088/1873-7005/abeda4

Cited by 7 publications

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Experimental and numerical investigation of compressibility effects on velocity derivative flatness in turbulence

et al. 2022

View full text Add to dashboard Cite

Compressibility effects on the velocity derivative flatness [Formula: see text] are investigated by experiments with opposing arrays of piston-driven synthetic jet actuators (PSJAs) and direct numerical simulations (DNS) of statistically steady compressible isotropic turbulence and temporally evolving turbulent planar jets with subsonic or supersonic jet velocities. Experiments using particle image velocimetry show that nearly homogeneous isotropic turbulence is generated at the center of a closed box from interactions between supersonic synthetic jets. The dependencies of [Formula: see text] on the turbulent Reynolds number [Formula: see text] and the turbulent Mach number MT are examined both experimentally and using DNS. Previous studies of incompressible turbulence indicate a universal relationship between [Formula: see text] and [Formula: see text]. However, both experiments and DNS confirm that [Formula: see text] increases relative to the incompressible turbulence via compressibility effects. Although [Formula: see text] tends to be larger with MT in each flow, the [Formula: see text] in the turbulent jets and the turbulence generated from PSJAs deviate from those in incompressible turbulence at lower MT compared with isotropic turbulence sustained by a solenoidal forcing. The PSJAs and supersonic planar jets generate strong pressure waves, and the wave propagation can cause an increased [Formula: see text], even at low MT. These results suggest that the compressibility effects on [Formula: see text] are not solely determined from a local value of MT and depend on the turbulence generation process.

show abstract

Experimental and numerical investigation of compressibility effects on velocity derivative flatness in turbulence

et al. 2022

View full text Add to dashboard Cite

show abstract

Fundamental review on collision of blast waves

Almustafa

Nehdi

2023

Physics of Fluids

View full text Add to dashboard Cite

The introduction and pinnacle of colliding blast waves research commenced in the 1950's following World War II. Since then, sporadic studies have appeared throughout the literature up until the early 1990s beyond which a significant contributory gap on the topic ensued. With the interminable proactivity of modern civil and aerospace defense research in the past several decades, investigations on the phenomena of blast wave collisions have fallen behind in comparison. Recent events and applications of offensive and defensive operations have slowly begun to rekindle studies on colliding blast waves in the last few years. However, there remains limitations on the extent of analyses which have yet to be adequately addressed. This review attempts to critically compile and analyze all existing research on blast wave collisions to identify pertinent shortcomings of the present state-of-the-art. In addition, related investigations of colliding shock waves and the collision of shock waves and blast waves are also provided to further elaborate on their distinctions to colliding blast waves. Prior to such discussions, the fundamentals of blast wave behaviors in terms of their characteristics, formation, and propagation are presented to pave a background to subsequent advanced topics. Lastly, unique classifications of direct and indirect applications of blast wave collisions are presented with modern perspectives. As a result, a classical problem is reawakened towards understanding and addressing highly complex and dynamic shock wave systems in defense applications.

show abstract

Local geometry of a weak normal shock wave interacting with turbulence

Kusuhata,

Tanaka,

Watanabe

et al. 2023

Physics of Fluids

View full text Add to dashboard Cite

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.

show abstract

Losing the shock wave front profile due to interaction with turbulence

Cited by 7 publications

References 26 publications

Experimental and numerical investigation of compressibility effects on velocity derivative flatness in turbulence

Experimental and numerical investigation of compressibility effects on velocity derivative flatness in turbulence

Fundamental review on collision of blast waves

Local geometry of a weak normal shock wave interacting with turbulence

Contact Info

Product

Resources

About