{"id":348553,"date":"2016-12-29T03:00:00","date_gmt":"2016-12-29T00:00:00","guid":{"rendered":"https:\/\/www.fyysika.ee\/?guid=4b7574b50046d507971efb599f69aa15"},"modified":"2016-12-29T03:00:00","modified_gmt":"2016-12-29T00:00:00","slug":"flow-visualisation-of-downhill-skiers-using-the-lattice-boltzmann-method-2","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=348553","title":{"rendered":"Flow visualisation of downhill skiers using the lattice Boltzmann method"},"content":{"rendered":"<p>In downhill alpine skiing, skiers often exceed speeds of 120 km h \u22121 , with air resistance<br \/>\nsubstantially affecting the overall race times. To date, studies on air resistance in alpine skiing<br \/>\nhave used wind tunnels and actual skiers to examine the relationship between the gliding posture and<br \/>\nmagnitude of drag and for the design of skiing equipment. However, these studies have not revealed<br \/>\nthe flow velocity distribution and vortex structure around the skier. In the present study,<br \/>\ncomputational fluid dynamics are employed with the lattice Boltzmann method to derive the<br \/>\nrelationship between total drag and the flow velocity around a downhill skier in the full-tuck<br \/>\nposition. Furthermore, the flow around the downhill skier is visualised, and its vortex structure is<br \/>\nexamined. The results show that the total drag force in the downhill skier model is 27.0 N at a flow<br \/>\nvelocity of 15 m s \u22121 , increasing to 185.8 N at 40 m s \u22121 . From analysis of the drag distribut&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In downhill alpine skiing, skiers often exceed speeds of 120 km h \u22121 , with air resistance<br \/>\nsubstantially affecting the overall race times. To date, studies on air resistance in alpine skiing<br \/>\nhave used wind tunnels and actual skiers to examine the r&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-348553","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/348553","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=348553"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/348553\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=348553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=348553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=348553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}