ICIAM\u306e\u305f\u30818\u6708\u306b\u6765\u65e5\u3055\u308c\u308bSamriddhi Sanker Ray\u3055\u3093\u3068Statphys\u306e\u305f\u30818\u6708\u306b\u6765\u65e5\u3055\u308c\u308bLuca Biferale\u3055\u3093\u304c\u4eac\u5927\u7406\u7269\u7406\u306b\u3082\u6765\u8a2a\u3055\u308c\u3066\u4ee5\u4e0b\u306e\u30bb\u30df\u30ca\u30fc\u30928\/17\u5348\u5f8c\u306b\u9023\u7d9a\u3057\u3066\u884c\u3044\u307e\u3059\u3002\u3054\u8208\u5473\u306e\u3042\u308b\u65b9\u306e\u3054\u6765\u8074\u3092\u6b53\u8fce\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u65e5\u6642: \uff18\u6708\uff11\uff17\u65e5\uff08\u6728\uff09 \uff11\uff13\uff1a\uff11\uff15 \u304b\u3089 \uff11\uff14\uff1a\uff14\uff15<\/p>\n\n\n\n
\u5834\u6240: \u4eac\u5927 \u7406\u5b66\u7814\u7a76\u79d1\uff15\u53f7\u9928(\u7269\u7406\u5b66\u6559\u5ba4) \uff14\uff10\uff11\u53f7\u5ba4<\/p>\n\n\n\n
\u8b1b\u5e2b\uff1a Samriddhi Sanker Ray (ICTS Bangalore)<\/p>\n\n\n\n
\u8b1b\u6f14\u984c\u76ee\uff1a In what sense are bacterial suspensions turbulent?<\/p>\n\n\n\n
\u8b1b\u6f14\u8981\u65e8:
Active turbulence — the spatio-temporally complex motion of a dense suspension of microorganisms such as bacteria — has gathered great traction recently as an intriguing class of emergent, complex flows, occurring in several living systems at the mesoscale, whose understanding lies at the interface of non-equilibrium physics and biology. However, are these low Reynolds number living flows really turbulent or just chaotic with structural, or even superficial, similarities with high Reynolds number (classical) inanimate turbulence? This is a vital question as the fingerprints of classical turbulence \u2014– universality, intermittency and chaos \u2014– makes it unique amongst the many different driven-dissipative systems. In this talk we address these questions with a focus on the issues of (approximate) scale-invariance, intermittency and maximally chaotic states and how they lead to anomalous diffusion in bacterial suspensions. In particular, we show the existing of a critical level of activity beyond which the physics of bacterial flows become universal, accompanied by maximally chaotic states which allow for efficient, Levy-walk mediated foraging strategies.<\/p>\n\n\n\n
\u65e5\u6642: \uff18\u6708\uff11\uff17\u65e5\uff08\u6728\uff09 \uff11\uff15\uff1a\uff10\uff10 \u304b\u3089 \uff11\uff16\uff1a\uff13\uff10<\/p>\n\n\n\n
\u5834\u6240: \u4eac\u5927 \u7406\u5b66\u7814\u7a76\u79d1\uff15\u53f7\u9928(\u7269\u7406\u5b66\u6559\u5ba4) \uff14\uff10\uff11\u53f7\u5ba4<\/p>\n\n\n\n
\u8b1b\u5e2b\uff1a Luca Biferale (University of Rome ‘Tor Vergata’)<\/p>\n\n\n\n
\u8b1b\u6f14\u984c\u76ee\uff1a Data-driven and equations-informed tools for modelling turbulent flows<\/p>\n\n\n\n
\u8b1b\u6f14\u8981\u65e8:
Our ability to collect data is rapidly increasing thanks to computational power and the unprecedented diversity of sensors. But how good are we at extracting, reconstructing, and understanding information from them? We present a short overview of some recent advancements for data-assimilation and modelling of turbulent multi-scale flows using both data-driven and equations-informed tools, starting from sparse and heterogeneous observations of complex fluid systems. Issues connected to validations and benchmarks in the presence of full or partial observability will be discussed. A few examples of data-augmentation based on Generative Adversarial Learning [1], Nudging, Gappy-Proper Orthogonal Decomposition [2] and Generative Diffusion Models will be quantitatively discussed [3].<\/p>\n\n\n\n
[1] M. Buzzicotti, F. Bonaccorso, P. Clark Di Leoni, L. Biferale. Reconstruction of turbulent data with deep generative models for semantic inpainting from TURB-Rot database. Physical Review Fluids 6 (5), 050503, (2021).
[2] T. Li, M. Buzzicotti, L. Biferale, F. Bonaccorso, S. Chen, M. Wan. Data reconstruction of turbulent flows with Gappy POD, Extended POD and Generative Adversarial Networks. arXiv:2210.11921v1(2022) Journal Fluid Mechanics (in press)
[3] T Li, L Biferale, F Bonaccorso. M Scarpolini and M Buzzicotti, Sunthetic Lagrangian Turbulence by Generayive Diffusion Models, arxive 2307.08529 (2023)<\/p>\n","protected":false},"excerpt":{"rendered":"
ICIAM\u306e\u305f\u30818\u6708\u306b\u6765\u65e5\u3055\u308c\u308bSamriddhi Sanker Ray\u3055\u3093\u3068Statphys\u306e\u305f\u30818\u6708\u306b\u6765\u65e5\u3055\u308c\u308bLuca Biferale\u3055\u3093\u304c\u4eac\u5927\u7406\u7269\u7406\u306b\u3082\u6765\u8a2a\u3055\u308c\u3066\u4ee5\u4e0b\u306e\u30bb\u30df\u30ca\u30fc\u30928\/17\u5348\u5f8c\u306b\u9023\u7d9a\u3057\u3066\u884c\u3044\u307e\u3059\u3002 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-1392","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"http:\/\/kyoryu.scphys.kyoto-u.ac.jp\/index.php?rest_route=\/wp\/v2\/posts\/1392","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/kyoryu.scphys.kyoto-u.ac.jp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/kyoryu.scphys.kyoto-u.ac.jp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/kyoryu.scphys.kyoto-u.ac.jp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/kyoryu.scphys.kyoto-u.ac.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1392"}],"version-history":[{"count":2,"href":"http:\/\/kyoryu.scphys.kyoto-u.ac.jp\/index.php?rest_route=\/wp\/v2\/posts\/1392\/revisions"}],"predecessor-version":[{"id":1394,"href":"http:\/\/kyoryu.scphys.kyoto-u.ac.jp\/index.php?rest_route=\/wp\/v2\/posts\/1392\/revisions\/1394"}],"wp:attachment":[{"href":"http:\/\/kyoryu.scphys.kyoto-u.ac.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1392"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/kyoryu.scphys.kyoto-u.ac.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1392"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/kyoryu.scphys.kyoto-u.ac.jp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1392"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}