English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Adequate modelling of the multiphase interstellar medium requires opticallythin radiative cooling, comprising an inherent thermal instability. The size ofthe occurring condensation and evaporation interfaces is determined by theso-called Field-length, which gives the dimension at which the instability issignificantly damped by thermal conduction. Our aim is to study the relevanceof conduction scale effects in the numerical modelling of a bistable medium andcheck the applicability of conventional and alternative adaptive meshtechniques. The low physical value of the thermal conduction within the ISMdefines a multiscale problem, hence promoting the use of adaptive meshes. Wehere introduce a new refinement strategy that applies the Field condition byKoyama & Inutsuka as a refinement criterion. The described method is verysimilar to the Jeans criterion for gravitational instability by Truelove andefficiently allows to trace the unstable gas situated at the thermalinterfaces. We present test computations that demonstrate the greater accuracyof the newly proposed refinement criterion in comparison to refinement based onthe local density gradient. Apart from its usefulness as a refinement trigger,we do not find evidence in favour of the Field criterion as a prerequisite fornumerical stability.

A Field-length based refinement criterion for adaptive mesh simulations of the interstellar medium