Cooling and instabilities in colliding flows

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dc.citation.firstpage2266
dc.citation.issueNumber2
dc.citation.journalTitleMonthly Notices of the Royal Astronomical Society
dc.citation.lastpage2278
dc.citation.volumeNumber508
dc.contributor.authorMarkwick, R.N.
dc.contributor.authorFrank, A.
dc.contributor.authorCarroll-Nellenback, J.
dc.contributor.authorLiu, B.
dc.contributor.authorBlackman, E.G.
dc.contributor.authorLebedev, S.V.
dc.contributor.authorHartigan, P.M.
dc.date.accessioned2021-12-02T16:22:39Z
dc.date.available2021-12-02T16:22:39Z
dc.date.issued2021
dc.description.abstractCollisional self-interactions occurring in protostellar jets give rise to strong shocks, the structure of which can be affected by radiative cooling within the flow. To study such colliding flows, we use the AstroBEAR AMR code to conduct hydrodynamic simulations in both one and three dimensions with a power-law cooling function. The characteristic length and time-scales for cooling are temperature dependent and thus may vary as shocked gas cools. When the cooling length decreases sufficiently and rapidly, the system becomes unstable to the radiative shock instability, which produces oscillations in the position of the shock front; these oscillations can be seen in both the one- and three-dimensional cases. Our simulations show no evidence of the density clumping characteristic of a thermal instability, even when the cooling function meets the expected criteria. In the three-dimensional case, the nonlinear thin shell instability (NTSI) is found to dominate when the cooling length is sufficiently small. When the flows are subjected to the radiative shock instability, oscillations in the size of the cooling region allow NTSI to occur at larger cooling lengths, though larger cooling lengths delay the onset of NTSI by increasing the oscillation period.
dc.identifier.citationMarkwick, R.N., Frank, A., Carroll-Nellenback, J., et al.. "Cooling and instabilities in colliding flows." <i>Monthly Notices of the Royal Astronomical Society,</i> 508, no. 2 (2021) Oxford University Press: 2266-2278. https://doi.org/10.1093/mnras/stab2577.
dc.identifier.doihttps://doi.org/10.1093/mnras/stab2577
dc.identifier.urihttps://hdl.handle.net/1911/111738
dc.language.isoeng
dc.publisherOxford University Press
dc.rightsThis is an author's manuscript. The published article is copyrighted by Oxford University Press.
dc.titleCooling and instabilities in colliding flows
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpre-print
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