{"id":92455,"date":"2025-06-18T10:07:31","date_gmt":"2025-06-18T08:07:31","guid":{"rendered":"https:\/\/wfa.uwr.edu.pl\/?post_type=wydarzenia&#038;p=92455"},"modified":"2025-06-18T10:09:02","modified_gmt":"2025-06-18T08:09:02","slug":"simulating-saltation","status":"publish","type":"wydarzenia","link":"https:\/\/wfa.uwr.edu.pl\/en\/wydarzenia\/simulating-saltation\/","title":{"rendered":"Simulating Saltation"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>Hans Herrmann<\/strong>\u00a0(UFC Fortaleza and PMMH Paris)<br>Title: Simulating Saltation<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">Abstract:<\/h2>\n\n\n\n<p>Saltation is the jumping motion of sand grains driven by wind. It is the transport mechanism responsible for the formation of dunes. Wind tunnel experiments and numerical simulation have revealed a rich choreography in the granular dance of saltation. There exist three types of grains, those that crawl on the ground, the &#8220;creapers&#8221;, those that make many small jumps, the &#8220;leapers&#8221; which form a soft bed floating above the ground and over which jump through mid-air collisions the &#8220;saltons&#8221; performing huge jumps with high speed. Mid-air collisions thus manage to increase the total sand flux by over a factor of two. Sustained saltation only exists above a certain threshold in wind speed. At this threshold the saturated flux exhibits a jump and one finds a range of metastable saltation with intermittent bursts of activity that are related to the turbulence of the wind. While on Earth this occurs ten to twenty centimeters above the ground on Mars the saltons can attain heights of up to hundred meters.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Bio (EN):<\/h2>\n\n\n\n<p>Born 1954 in Cuba, and raised in Bogot\u00e1, he studied physics in G\u00f6ttingen and Cologne where he made 1978 his diploma and 1981 his PhD in statistical physics and then after one year post-doc in the US went to Service de Physique Th\u00e9orique in Saclay becoming member of CNRS to which he still belongs today. He was 1990 &#8211; 1994 group leader at HLRZ of KFA J\u00fclich, 1994 &#8211; 2000, director of the PMMH at ESPCI, Paris; 1996 &#8211; 2006, professor and head of the Institute of Computer Physics at the University of Stuttgart and was from 2006 till 2019 full professor at the Institute of Building Materials at ETH Z\u00fcrich from which he is presently emeritus. Presently he is back at PMMH in Paris and professor at the Physics department of UFC Fortaleza in Brazil. Author of over 700 publications, Guggenheim Fellow (1986), member of the Brazilian (1987) and Colombian (2014) Academies of Science (1987), Max-Planck Research Prize (2002) and Gentner-Kastler Prize (2004), ERC Advanced (2012), Aneesur Rahman Prize (2018), managing editor of Int.J.Mod.Phys.C and Granular Matter and member of several editorial boards and commissions including president of the French Equipment Commission in 2010. Of his former PhD students and post-docs 37 are presently professors. He made lasting contributions to understand fracture of heterogeneous materials and properties of granular media and built a special purpose computer to calculate the conductivity of percolation clusters. Highlights were the discovery of space-filling bearings and the establishment of equations of motion of dunes. His present research subjects include watersheds, neural avalanches, charged granular media and complex networks. (Za <a href=\"https:\/\/underline.io\/speakers\/95680-hans-herrmann\">https:\/\/underline.io\/speakers\/95680-hans-herrmann<\/a>)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Bio:<\/h2>\n\n\n\n<p>Urodzony w 1954 r. na Kubie i wychowany w Bogocie, studiowa\u0142 fizyk\u0119 w Getyndze i Kolonii, gdzie w 1978 r. uzyska\u0142 dyplom, a w 1981 r. doktorat z fizyki statystycznej, a nast\u0119pnie po rocznym post-doc w USA przeszed\u0142 do Service de Physique Th\u00e9orique w Saclay, staj\u0105c si\u0119 cz\u0142onkiem CNRS, do kt\u00f3rego nale\u017cy do dzi\u015b. W latach 1990-1994 by\u0142 kierownikiem grupy w HLRZ KFA J\u00fclich, w latach 1994-2000 dyrektorem PMMH w ESPCI w Pary\u017cu; w latach 1996-2006 profesorem i kierownikiem Instytutu Fizyki Komputerowej na Uniwersytecie w Stuttgarcie, a od 2006 do 2019 roku by\u0142 profesorem zwyczajnym w Instytucie Materia\u0142\u00f3w Budowlanych na ETH Z\u00fcrich, gdzie obecnie jest emerytowany. Obecnie powr\u00f3ci\u0142 do PMMH w Pary\u017cu i jest profesorem na wydziale fizyki UFC Fortaleza w Brazylii. Autor ponad 700 publikacji, stypendysta Guggenheima (1986), cz\u0142onek brazylijskiej (1987) i kolumbijskiej (2014) Akademii Nauk (1987), Max-Planck Research Prize (2002) i Gentner-Kastler Prize (2004), ERC Advanced (2012), Aneesur Rahman Prize (2018), redaktor zarz\u0105dzaj\u0105cy Int.J.Mod.Phys.C i Granular Matter oraz cz\u0142onek kilku rad redakcyjnych i komisji, w tym przewodnicz\u0105cy francuskiej komisji ds. sprz\u0119tu w 2010 roku. Spo\u015br\u00f3d jego by\u0142ych doktorant\u00f3w i post-doc\u00f3w 37 jest obecnie profesorami. Wni\u00f3s\u0142 trwa\u0142y wk\u0142ad w zrozumienie p\u0119kania materia\u0142\u00f3w heterogenicznych i w\u0142a\u015bciwo\u015bci medi\u00f3w ziarnistych oraz zbudowa\u0142 komputer specjalnego przeznaczenia do obliczania przewodnictwa klastr\u00f3w perkolacyjnych. Najwa\u017cniejszymi odkryciami by\u0142o odkrycie \u0142o\u017cysk wype\u0142niaj\u0105cych przestrze\u0144 i ustalenie r\u00f3wna\u0144 ruchu wydm. Jego obecne tematy badawcze obejmuj\u0105 zlewnie, lawiny neuronowe, na\u0142adowane media ziarniste i z\u0142o\u017cone sieci.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Wyk\u0142ad profesora Hansa Herrmana<\/p>\n","protected":false},"author":2022,"featured_media":92458,"parent":0,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[264],"tags":[],"class_list":["post-92455","wydarzenia","type-wydarzenia","status-publish","has-post-thumbnail","hentry","category-wydarzenia"],"featured_image_urls_v2":{"full":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2025\/06\/pobierz.png",800,930,false],"thumbnail":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2025\/06\/pobierz-150x150.png",150,150,true],"medium":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2025\/06\/pobierz-258x300.png",258,300,true],"medium_large":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2025\/06\/pobierz-768x893.png",768,893,true],"large":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2025\/06\/pobierz.png",800,930,false],"1536x1536":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2025\/06\/pobierz.png",800,930,false],"2048x2048":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2025\/06\/pobierz.png",800,930,false],"menu-24x24":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2025\/06\/pobierz-21x24.png",21,24,true],"menu-36x36":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2025\/06\/pobierz-31x36.png",31,36,true],"menu-48x48":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2025\/06\/pobierz-41x48.png",41,48,true]},"post_excerpt_stackable_v2":"<p>Wyk\u0142ad profesora Hansa Herrmana<\/p>\n","category_list_v2":"<a href=\"https:\/\/wfa.uwr.edu.pl\/category\/wydarzenia\/\" rel=\"category tag\">Wydarzenia<\/a>","author_info_v2":{"name":"Joanna Molenda-\u017bakowicz","url":"https:\/\/wfa.uwr.edu.pl\/en\/author\/jmolendazakowicz\/"},"comments_num_v2":"0 comments","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - 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