{"id":3787,"date":"2018-02-14T16:57:07","date_gmt":"2018-02-14T15:57:07","guid":{"rendered":"http:\/\/wp.unil.ch\/risk\/?p=3787"},"modified":"2018-02-14T16:57:07","modified_gmt":"2018-02-14T15:57:07","slug":"remo-gygax-gpu-accelerated-numerical-simulations-and-laboratory-experiments-on-viscous-avalanches","status":"publish","type":"post","link":"https:\/\/wp.unil.ch\/risk\/remo-gygax-gpu-accelerated-numerical-simulations-and-laboratory-experiments-on-viscous-avalanches\/","title":{"rendered":"Remo Gygax: GPU accelerated numerical simulations and laboratory experiments on viscous avalanches"},"content":{"rendered":"<p><em>Remo Gygax<\/em><br \/>\nDirector: Prof. Y. Podladchikov<br \/>\nJury: Prof. M. Jaboyedoff, Prof. F. Herman, L. R\u00e4ss, C. Longchamp<\/p>\n<p style=\"text-align: justify\">Numerical simulations are an eective tool in natural risk analysis. They&nbsp;are useful to determine the propagation and the runout distance of gravity&nbsp;driven movements such as rock avalanches. A numerical model based&nbsp;on fluid mechanics is proposed to simulate such events. In absence of&nbsp;an accepted mathematical explanation of the interactions inside a rock&nbsp;avalanche bulk, a numerical viscous framework is established. Several&nbsp;studies have shown that the numerical implementation of physical processes&nbsp;of viscous flow produces a good t to actual observations of rock&nbsp;avalanche propagation. The use of a continuum approach enables to implement&nbsp;the equation of motion and the mass balance equation of viscous&nbsp;flow on a fully staggered grid. These equations are solved using a finite difference scheme.<\/p>\n<p style=\"text-align: justify\">The anticipated numerical results on viscous ow are well documented.&nbsp;Nevertheless, analogue laboratory experiments with glycerine on an incline&nbsp;are conducted to find the dependencies between the major parameters.&nbsp;The fingering of the viscous ow was successfully reproduced, at the&nbsp;same time in the laboratory as well as in the numerical implementation. Nowadays, High Performance Computing hardware is available at reasonable&nbsp;costs. Using parallel GPU computing with the Nvidia C-CUDA&nbsp;programming architecture allows to accelerate the simulation. The difference&nbsp;in performance is compared to the widely used scientific modelling&nbsp;software MATLAB. We obtain a nearly 158 times faster simulation while&nbsp;running the developed code on the parallel High Performance Computing&nbsp;architecture.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Remo Gygax Director: Prof. Y. Podladchikov Jury: Prof. M. Jaboyedoff, Prof. F. Herman, L. R\u00e4ss, C. Longchamp Numerical simulations are an eective tool in natural risk analysis. They&nbsp;are useful to &hellip; <\/p>\n","protected":false},"author":1341,"featured_media":3788,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[73758],"tags":[75174],"class_list":{"0":"post-3787","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-masters_completed","8":"tag-75174"},"_links":{"self":[{"href":"https:\/\/wp.unil.ch\/risk\/wp-json\/wp\/v2\/posts\/3787","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.unil.ch\/risk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.unil.ch\/risk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.unil.ch\/risk\/wp-json\/wp\/v2\/users\/1341"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.unil.ch\/risk\/wp-json\/wp\/v2\/comments?post=3787"}],"version-history":[{"count":0,"href":"https:\/\/wp.unil.ch\/risk\/wp-json\/wp\/v2\/posts\/3787\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wp.unil.ch\/risk\/wp-json\/wp\/v2\/media\/3788"}],"wp:attachment":[{"href":"https:\/\/wp.unil.ch\/risk\/wp-json\/wp\/v2\/media?parent=3787"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.unil.ch\/risk\/wp-json\/wp\/v2\/categories?post=3787"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.unil.ch\/risk\/wp-json\/wp\/v2\/tags?post=3787"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}