Visualisation of plane shock wave diffraction from the curved exit of a shock tube

Paton, R. T.; Skews, B. W.; Saligram, Alesha

doi:10.1007/s12650-014-0265-7

Cited by 1 publication

(1 citation statement)

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“…There are also some novel investigations of shock wave diffraction, such as diffraction from a curved exit from the shock tube 29 , the interaction of two perpendicular diffracting shock waves 44 and vortex merging caused by shock wave diffraction in three dimensions 6 .…”

Section: A Backgroundmentioning

confidence: 99%

Numerical investigation of rarefied vortex loop formation due to shock wave diffraction with the use of rorticity

2021

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When compressed gas is ejected from a nozzle into a low-pressure environment, the shock wave diffracts around the nozzle lip and a vortex loop will form. The phenomenon has been widely investigated in the continuum flow regime, but how the shock diffraction and vortex behave under rarefied flow conditions has not received as much attention. It is necessary to understand this transient flow in rarefied environments to improve thrust vector control and avoid potential contamination and erosion of spacecraft surfaces. This work provides numerical results of the vortex loop formation caused by shock wave diffraction around a 90 • corner using the direct simulation Monte Carlo method and the compressible Navier-Stokes equations with the appropriate Maxwell velocity slip and the von Smoluchowski temperature jump boundary conditions. The Mach number and rarefaction effects on the formation and evolution of the vortex loop are discussed. A study of the transient structures of vortex loops has been performed using the rorticity concept. A relationship of mutual transformation between the rorticity and shear vectors has been discovered, demonstrating that the application of this concept is useful to understand vortex flow phenomena.

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Section: A Backgroundmentioning

confidence: 99%