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Numerical investigation of the rarefied supersonic underexpanded jet structure using the DSMC method

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Thermophysics and Aeromechanics Aims and scope

Abstract

The Direct Simulation Monte Carlo (DSMC) method is used to study rarefaction effects on the structure of an axisymmetric underexpanded jet. A comparison with the data of other researchers shows that DSMC simulations accurately reproduce the features of the steady shock-wave structure of the jet. Rarefaction produces a noticeable effect on the jet flow. In particular, it makes the barrel shock in the first shock cell change the type of its reflection from the axis, which leads to vanishing of the developed Mach disk and to the changes in the structure of other shock cells. For the first time, the formation of a closed reverse flow region behind the Mach disk is observed in a molecular-kinetic simulation. This phenomenon has been earlier observed only in continuum simulations.

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Authors and Affiliations

  1. Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia

    A. V. Kashkovsky, A. N. Kudryavtsev & A. A. Shershnev

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  1. A. V. Kashkovsky
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  2. A. N. Kudryavtsev
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  3. A. A. Shershnev
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Correspondence to A. V. Kashkovsky.

Additional information

This study was supported by the Russian Science Foundation (Grant No. 18-11-00246-P). All computations were performed on computers of the Collective Use Center Mekhanika (Mechanics) based at ITAM SB RAS.

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Kashkovsky, A.V., Kudryavtsev, A.N. & Shershnev, A.A. Numerical investigation of the rarefied supersonic underexpanded jet structure using the DSMC method. Thermophys. Aeromech. 30, 29–36 (2023). https://doi.org/10.1134/S0869864323010043

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  • DOI: https://doi.org/10.1134/S0869864323010043

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