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Discrete Boltzmann model at Burnett level for compressible multicomponent flows under external forces
Demei Li, Huilin Lai, Chuandong Lin, Suni Chen
https://arxiv.org/abs/2607.20029 https://arxiv.org/pdf/2607.20029 https://arxiv.org/html/2607.20029
arXiv:2607.20029v1 Announce Type: new
Abstract: This work extends the Burnett-level discrete Boltzmann model (DBM) from single-component to multicomponent compressible flows under external forces, building on the fundamental framework of the high-precision discrete kinetic method. A high-isotropy 25-discrete-velocity set is adopted to guarantee numerical stability and spatial symmetry, while a rigorous moment-matching strategy is developed to construct the equilibrium distribution function and external force term. Different from the single-component counterpart, the present model intrinsically incorporates interspecies mass diffusion effects and multi-component thermodynamic nonequilibrium behaviors, which are critical for complex compressible multicomponent systems. The Chapman--Enskog expansion verifies that the proposed model can exactly recover the Burnett-level governing equations for forced multicomponent compressible flows in the continuum limit. Five canonical benchmark cases, including multicomponent mass diffusion, compressible Sod shock tube, thermal Couette flow, Kelvin--Helmholtz instability, and Rayleigh--Taylor instability, are systematically performed. Numerical results demonstrate that the developed Burnett-level multicomponent DBM achieves high accuracy and robustness in capturing both hydrodynamic evolution and multicomponent nonequilibrium characteristics under external forces.
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Interspecies clock comparison below $5 \times 10^{-18}$ uncertainty with a transportable clock
Chetan Vishwakarma, Ingo Nosske, Tim L\"ucke, Martin Steinel, Melina Filzinger, Erik Benkler, S\"oren D\"orscher, Nils Huntemann, Christian Lisdat
https://arxiv.org/abs/2608.01916

Just finished reading "The Beast Player" by Nahoko Uehashi. I had already watched the anime, but it had been so king I didn't remember all the details. While the anime was great, the book is even better, and it's going to be high on my list of things to recommend to my children when they're old enough to read for fun.
The neurodivergent representation is cool, as is the deep central question of interspecies bonds and the political possibilities and dangers they entail. Uehashi handles the exploration of that question well in my judgment, including appropriate ambiguity without muddying moral clarity. Elin is a truly fantastic protagonist, not without flaws but nevertheless a excellent role model and a very sympathetic figure without being pitiful.
One thing I really love about Uehashi's writing is that she's not shy about using interior narration to tell the reader directly what a variety of characters are feeling, but when she does this she focuses on human contradictions, quirks, and weaknesses that make those characters feel much richer, and that remind the reader of all the ways our weird and sometimes contradictory or inexplicable quirks guide our actions just as much as both logical thought and predictable/expected feelings. None of the characters is an unerring source of wisdom, with every grand principle presented shown to have its weaknesses and biases, and even the wisest characters making mistakes and learning from them.
Overall, a wonderful book, and having also seen the "Seirei no Moribito" anime but not read the books, I'm excited to dig into more of Uehashi's extensive catalog.
#AmReading #ReadingNow #Bookstodon