{"id":583,"date":"2015-02-25T18:03:15","date_gmt":"2015-02-25T23:03:15","guid":{"rendered":"https:\/\/engineering.jhu.edu\/zaki\/?page_id=583"},"modified":"2020-11-13T12:07:01","modified_gmt":"2020-11-13T17:07:01","slug":"viscoelastic-flows","status":"publish","type":"page","link":"https:\/\/engineering.jhu.edu\/zaki\/research\/viscoelastic-flows\/","title":{"rendered":"Viscoelastic flows"},"content":{"rendered":"<p>Unlike simple Newtonian fluids, complex viscoelastic fluids have a microstructure which endows them with macroscopic properties that defy our intuition. While a Newtonian fluid is depressed when stirred, a viscoelastic fluid climbs the rod; While a Newtonian fluid splashes against the surface, a viscoelastic jet bounces.\u00a0In large-scale flows dominated by inertia, viscoelasticity is an effective strategy for reducing turbulent skin friction. The two top-views\u00a0below contrast turbulence in channel flow of (left) Newtonian and (right) polymeric fluids. \u00a0The contours show the streamwise velocity perturbations. \u00a0Small-scale structures which are evident in the Newtonian flow are largely absent in the polymeric counterpart.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/02\/polymer_aa3-300x206.jpg\" alt=\"Newtonian\" width=\"300\" height=\"206\" \/>\u00a0<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/02\/polymer_aa2-300x206.jpg\" alt=\"Polymeric\" width=\"300\" height=\"206\" \/><\/p>\n<p>The dynamics of viscoelastic fluids have long remained mysterious. In this project we seek to further our understanding of their\u00a0dynamics through a combination of fully non-linear direct numerical simulations and theoretical\u00a0analyses. \u00a0By analyzing the simulation data, we are able to extract\u00a0the relevant\u00a0flow structures and\u00a0isolate and explain the underlying mechanics using our analysis of the relevant canonical configurations. \u00a0For example,\u00a0the videos below show the evolution of a weak spanwise vortex in homogeneous shear flow. The contours are the perturbation vorticity, and lines are the perturbation streamfunction. In the inviscid Newtonian fluid (left) the vorticity perturbations are advected by the base shear. In the weakly elastic fluid (centre) the vortex appears to split into a pair of new vortices. Furthermore, as the vortex is tilted forward under the action of the shear, the vorticity amplifies. This behaviour is impossible in a Newtonian fluid. Finally, in the strongly elastic fluid (right) the vortex splitting dominates, and the new vortices travel along the streamwise direction. This is a manifestation of elastic wave propagation along the tensioned mean-flow streamlines.<\/p>\n<p><div id=\"kgvid_kgvid_0_wrapper\" class=\"kgvid_wrapper kgvid_wrapper_inline kgvid_wrapper_inline_left\">\n\t\t\t<div id=\"video_kgvid_0_div\" class=\"fitvidsignore kgvid_videodiv\" data-id=\"kgvid_0\" data-kgvid_video_vars=\"{&quot;id&quot;:&quot;kgvid_0&quot;,&quot;attachment_id&quot;:800,&quot;player_type&quot;:&quot;Video.js v8&quot;,&quot;width&quot;:&quot;190&quot;,&quot;height&quot;:&quot;209&quot;,&quot;fullwidth&quot;:&quot;false&quot;,&quot;fixed_aspect&quot;:&quot;false&quot;,&quot;countable&quot;:true,&quot;count_views&quot;:&quot;quarters&quot;,&quot;start&quot;:&quot;&quot;,&quot;autoplay&quot;:&quot;false&quot;,&quot;pauseothervideos&quot;:&quot;false&quot;,&quot;set_volume&quot;:&quot;1&quot;,&quot;muted&quot;:&quot;false&quot;,&quot;meta&quot;:false,&quot;endofvideooverlay&quot;:&quot;&quot;,&quot;resize&quot;:&quot;true&quot;,&quot;auto_res&quot;:&quot;automatic&quot;,&quot;pixel_ratio&quot;:&quot;true&quot;,&quot;right_click&quot;:&quot;on&quot;,&quot;playback_rate&quot;:&quot;false&quot;,&quot;title&quot;:&quot;newtonian&quot;,&quot;skip_buttons&quot;:[],&quot;nativecontrolsfortouch&quot;:&quot;true&quot;,&quot;locale&quot;:&quot;en&quot;,&quot;enable_resolutions_plugin&quot;:&quot;true&quot;,&quot;default_res&quot;:false}\" itemprop=\"video\" itemscope itemtype=\"https:\/\/schema.org\/VideoObject\"><meta itemprop=\"thumbnailUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/newtonian_thumb2.jpg\"><meta itemprop=\"embedUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/newtonian.mov\"><meta itemprop=\"contentUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/newtonian.mov\"><meta itemprop=\"name\" content=\"newtonian\"><meta itemprop=\"description\" content=\"Video\"><meta itemprop=\"uploadDate\" content=\"2015-03-02T16:45:47-05:00\">\n\t\t\t\t<video id=\"video_kgvid_0\" playsinline controls preload=\"metadata\" poster=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/newtonian_thumb2.jpg\" width=\"190\" height=\"209\" class=\"fitvidsignore video-js kg-video-js-skin\">\n\t\t\t\t\t<source src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/newtonian.mov?id=0\" type=\"video\/mp4\" data-res=\"548p\">\n\t\t\t\t\t<source src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/newtonian-360.mp4?id=0\" type=\"video\/mp4\" data-res=\"360p\">\n\t\t\t\t\t<source src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/newtonian.webm?id=0\" type=\"video\/webm\" data-res=\"WEBM VP8\">\n\t\t\t\t<\/video>\n\t\t\t<\/div>\n\t\t<\/div>\u00a0<div id=\"kgvid_kgvid_1_wrapper\" class=\"kgvid_wrapper kgvid_wrapper_inline kgvid_wrapper_inline_left\">\n\t\t\t<div id=\"video_kgvid_1_div\" class=\"fitvidsignore kgvid_videodiv\" data-id=\"kgvid_1\" data-kgvid_video_vars=\"{&quot;id&quot;:&quot;kgvid_1&quot;,&quot;attachment_id&quot;:804,&quot;player_type&quot;:&quot;Video.js v8&quot;,&quot;width&quot;:&quot;190&quot;,&quot;height&quot;:&quot;209&quot;,&quot;fullwidth&quot;:&quot;false&quot;,&quot;fixed_aspect&quot;:&quot;false&quot;,&quot;countable&quot;:true,&quot;count_views&quot;:&quot;quarters&quot;,&quot;start&quot;:&quot;&quot;,&quot;autoplay&quot;:&quot;false&quot;,&quot;pauseothervideos&quot;:&quot;false&quot;,&quot;set_volume&quot;:&quot;1&quot;,&quot;muted&quot;:&quot;false&quot;,&quot;meta&quot;:false,&quot;endofvideooverlay&quot;:&quot;&quot;,&quot;resize&quot;:&quot;true&quot;,&quot;auto_res&quot;:&quot;automatic&quot;,&quot;pixel_ratio&quot;:&quot;true&quot;,&quot;right_click&quot;:&quot;on&quot;,&quot;playback_rate&quot;:&quot;false&quot;,&quot;title&quot;:&quot;Weak elasticity&quot;,&quot;skip_buttons&quot;:[],&quot;nativecontrolsfortouch&quot;:&quot;true&quot;,&quot;locale&quot;:&quot;en&quot;,&quot;enable_resolutions_plugin&quot;:&quot;true&quot;,&quot;default_res&quot;:false}\" itemprop=\"video\" itemscope itemtype=\"https:\/\/schema.org\/VideoObject\"><meta itemprop=\"thumbnailUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/amplify_thumb1.jpg\"><meta itemprop=\"embedUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/amplify.mov\"><meta itemprop=\"contentUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/amplify.mov\"><meta itemprop=\"name\" content=\"Weak elasticity\"><meta itemprop=\"description\" content=\"Video\"><meta itemprop=\"uploadDate\" content=\"2015-03-03T10:13:59-05:00\">\n\t\t\t\t<video id=\"video_kgvid_1\" playsinline controls preload=\"metadata\" poster=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/amplify_thumb1.jpg\" width=\"190\" height=\"209\" class=\"fitvidsignore video-js kg-video-js-skin\">\n\t\t\t\t\t<source src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/amplify.mov?id=1\" type=\"video\/mp4\" data-res=\"548p\">\n\t\t\t\t\t<source src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/amplify-360.mp4?id=1\" type=\"video\/mp4\" data-res=\"360p\">\n\t\t\t\t<\/video>\n\t\t\t<\/div>\n\t\t<\/div>\u00a0<div id=\"kgvid_kgvid_2_wrapper\" class=\"kgvid_wrapper kgvid_wrapper_inline kgvid_wrapper_inline_left\">\n\t\t\t<div id=\"video_kgvid_2_div\" class=\"fitvidsignore kgvid_videodiv\" data-id=\"kgvid_2\" data-kgvid_video_vars=\"{&quot;id&quot;:&quot;kgvid_2&quot;,&quot;attachment_id&quot;:806,&quot;player_type&quot;:&quot;Video.js v8&quot;,&quot;width&quot;:&quot;190&quot;,&quot;height&quot;:&quot;209&quot;,&quot;fullwidth&quot;:&quot;false&quot;,&quot;fixed_aspect&quot;:&quot;false&quot;,&quot;countable&quot;:true,&quot;count_views&quot;:&quot;quarters&quot;,&quot;start&quot;:&quot;&quot;,&quot;autoplay&quot;:&quot;false&quot;,&quot;pauseothervideos&quot;:&quot;false&quot;,&quot;set_volume&quot;:&quot;1&quot;,&quot;muted&quot;:&quot;false&quot;,&quot;meta&quot;:false,&quot;endofvideooverlay&quot;:&quot;&quot;,&quot;resize&quot;:&quot;true&quot;,&quot;auto_res&quot;:&quot;automatic&quot;,&quot;pixel_ratio&quot;:&quot;true&quot;,&quot;right_click&quot;:&quot;on&quot;,&quot;playback_rate&quot;:&quot;false&quot;,&quot;title&quot;:&quot;Strong elasticity&quot;,&quot;skip_buttons&quot;:[],&quot;nativecontrolsfortouch&quot;:&quot;true&quot;,&quot;locale&quot;:&quot;en&quot;,&quot;enable_resolutions_plugin&quot;:&quot;true&quot;,&quot;default_res&quot;:false}\" itemprop=\"video\" itemscope itemtype=\"https:\/\/schema.org\/VideoObject\"><meta itemprop=\"thumbnailUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/propagate_thumb2.jpg\"><meta itemprop=\"embedUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/propagate.mov\"><meta itemprop=\"contentUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/propagate.mov\"><meta itemprop=\"name\" content=\"Strong elasticity\"><meta itemprop=\"description\" content=\"Video\"><meta itemprop=\"uploadDate\" content=\"2015-03-03T10:16:13-05:00\">\n\t\t\t\t<video id=\"video_kgvid_2\" playsinline controls preload=\"metadata\" poster=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/propagate_thumb2.jpg\" width=\"190\" height=\"209\" class=\"fitvidsignore video-js kg-video-js-skin\">\n\t\t\t\t\t<source src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/propagate.mov?id=2\" type=\"video\/mp4\" data-res=\"548p\">\n\t\t\t\t\t<source src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/propagate-360.mp4?id=2\" type=\"video\/mp4\" data-res=\"360p\">\n\t\t\t\t<\/video>\n\t\t\t<\/div>\n\t\t<\/div><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Unlike simple Newtonian fluids, complex viscoelastic fluids have a microstructure which endows them with macroscopic properties that defy our intuition. While a Newtonian fluid is depressed when stirred, a viscoelastic fluid climbs the rod; While a Newtonian fluid splashes against the surface, a viscoelastic jet bounces.\u00a0In large-scale flows dominated by inertia, viscoelasticity is an effective [&hellip;]<\/p>\n","protected":false},"author":127,"featured_media":0,"parent":30,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"class_list":["post-583","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Viscoelastic flows - Flow Science and Engineering<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/engineering.jhu.edu\/zaki\/research\/viscoelastic-flows\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Viscoelastic flows - Flow Science and Engineering\" \/>\n<meta property=\"og:description\" content=\"Unlike simple Newtonian fluids, complex viscoelastic fluids have a microstructure which endows them with macroscopic properties that defy our intuition. While a Newtonian fluid is depressed when stirred, a viscoelastic fluid climbs the rod; While a Newtonian fluid splashes against the surface, a viscoelastic jet bounces.\u00a0In large-scale flows dominated by inertia, viscoelasticity is an effective [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/engineering.jhu.edu\/zaki\/research\/viscoelastic-flows\/\" \/>\n<meta property=\"og:site_name\" content=\"Flow Science and Engineering\" \/>\n<meta property=\"article:modified_time\" content=\"2020-11-13T17:07:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/02\/polymer_aa3-300x206.jpg\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/viscoelastic-flows\\\/\",\"url\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/viscoelastic-flows\\\/\",\"name\":\"Viscoelastic flows - Flow Science and Engineering\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/viscoelastic-flows\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/viscoelastic-flows\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/wp-content\\\/uploads\\\/2015\\\/02\\\/polymer_aa3-300x206.jpg\",\"datePublished\":\"2015-02-25T23:03:15+00:00\",\"dateModified\":\"2020-11-13T17:07:01+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/viscoelastic-flows\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/viscoelastic-flows\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/viscoelastic-flows\\\/#primaryimage\",\"url\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/wp-content\\\/uploads\\\/2015\\\/02\\\/polymer_aa3.jpg\",\"contentUrl\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/wp-content\\\/uploads\\\/2015\\\/02\\\/polymer_aa3.jpg\",\"width\":604,\"height\":415},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/viscoelastic-flows\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Research\",\"item\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Viscoelastic flows\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/#website\",\"url\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/\",\"name\":\"Flow Science and Engineering\",\"description\":\"Tamer Zaki&#039;s Research Group\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Viscoelastic flows - Flow Science and Engineering","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/engineering.jhu.edu\/zaki\/research\/viscoelastic-flows\/","og_locale":"en_US","og_type":"article","og_title":"Viscoelastic flows - Flow Science and Engineering","og_description":"Unlike simple Newtonian fluids, complex viscoelastic fluids have a microstructure which endows them with macroscopic properties that defy our intuition. 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