{"id":105,"date":"2014-08-18T15:13:33","date_gmt":"2014-08-18T19:13:33","guid":{"rendered":"https:\/\/engineering.jhu.edu\/zaki\/?page_id=105"},"modified":"2020-11-13T12:06:47","modified_gmt":"2020-11-13T17:06:47","slug":"turbomachinery","status":"publish","type":"page","link":"https:\/\/engineering.jhu.edu\/zaki\/research\/turbomachinery\/","title":{"rendered":"Turbomachinery"},"content":{"rendered":"<p>This research collaboration aims at simulating, in detail, the role of transition in compressor aerodynamics.\u00a0The flow through the passage is subjected to adverse pressure gradient, which is destabilizing, and can lead to transition to turbulence or boundary layer separation.\u00a0In addition to the mean pressure gradient, the boundary layers on the compressor blade are forced by free-stream vortical disturbances.\u00a0The interaction between these disturbances and the near-wall flow play a significant role in the compressor performance.<\/p>\n<p>The clip below shows three planes, one near the pressure side (bottom surface of the blade), one at mid-pitch, and one near the suction surface (top surface of the blade). Contours show the tangential velocity perturbations.\u00a0It is interesting to contrast the pressure and suction surface of the blade.\u00a0 Despite sharing the same leading edge and free-stream conditions, breakdown to turbulence on each surface follows a distinctly different route.<\/p>\n<p>The pressure side of the blade undergoes bypass transition in\u00a0a manner similar to\u00a0that observed in DNS of simple flat plate boundary layers.\u00a0While the elongated Klebanoff streaks are clearly seen in the clip, the spots are concealed by the high-amplitude of the Klebanoff disturbance.\u00a0This project therefore benefits from our previous research on bypass transition in canonical flow settings such as flat plate boundary layers (Zaki &amp; Durbin 2005, 2006).<\/p>\n<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;:840,&quot;player_type&quot;:&quot;Video.js v8&quot;,&quot;width&quot;:&quot;640&quot;,&quot;height&quot;:&quot;369&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;ThreePlanesNewMovie&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\/ThreePlanesNewMovie_thumb2.jpg\"><meta itemprop=\"embedUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/ThreePlanesNewMovie.mov\"><meta itemprop=\"contentUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/ThreePlanesNewMovie.mov\"><meta itemprop=\"name\" content=\"ThreePlanesNewMovie\"><meta itemprop=\"description\" content=\"Video\"><meta itemprop=\"uploadDate\" content=\"2015-03-03T14:14:25-05:00\">\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\/ThreePlanesNewMovie_thumb2.jpg\" width=\"640\" height=\"369\" 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\/ThreePlanesNewMovie.mov?id=0\" type=\"video\/mp4\" data-res=\"448p\">\n\t\t\t\t\t<source src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/ThreePlanesNewMovie-360.mp4?id=0\" type=\"video\/mp4\" data-res=\"360p\">\n\t\t\t\t<\/video>\n\t\t\t<\/div>\n\t\t<\/div>\n<p>On the suction side (upper surface), the airfoil experiences laminar separation, followed by turbulent reattachment.\u00a0The clip below shows the presence of boundary layer streaks upstream of the mean separation location. The instantaneous separation surface is therefore modulated by these streamwise streaks, and the spectral characteristics of the flow are changed.<\/p>\n<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;:842,&quot;player_type&quot;:&quot;Video.js v8&quot;,&quot;width&quot;:&quot;640&quot;,&quot;height&quot;:&quot;265&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;Sctn_Sprtn_Mdltn_Streaks&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\/Sctn_Sprtn_Mdltn_Streaks_thumb4.jpg\"><meta itemprop=\"embedUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/Sctn_Sprtn_Mdltn_Streaks.mov\"><meta itemprop=\"contentUrl\" content=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/Sctn_Sprtn_Mdltn_Streaks.mov\"><meta itemprop=\"name\" content=\"Sctn_Sprtn_Mdltn_Streaks\"><meta itemprop=\"description\" content=\"Video\"><meta itemprop=\"uploadDate\" content=\"2015-03-03T14:21:01-05:00\">\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\/Sctn_Sprtn_Mdltn_Streaks_thumb4.jpg\" width=\"640\" height=\"265\" 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\/Sctn_Sprtn_Mdltn_Streaks.mov?id=1\" type=\"video\/mp4\" data-res=\"496p\">\n\t\t\t\t\t<source src=\"https:\/\/engineering.jhu.edu\/zaki\/wp-content\/uploads\/2015\/03\/Sctn_Sprtn_Mdltn_Streaks-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>\n","protected":false},"excerpt":{"rendered":"<p>This research collaboration aims at simulating, in detail, the role of transition in compressor aerodynamics.\u00a0The flow through the passage is subjected to adverse pressure gradient, which is destabilizing, and can lead to transition to turbulence or boundary layer separation.\u00a0In addition to the mean pressure gradient, the boundary layers on the compressor blade are forced by [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":30,"menu_order":4,"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-105","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>Turbomachinery - 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\/turbomachinery\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Turbomachinery - Flow Science and Engineering\" \/>\n<meta property=\"og:description\" content=\"This research collaboration aims at simulating, in detail, the role of transition in compressor aerodynamics.\u00a0The flow through the passage is subjected to adverse pressure gradient, which is destabilizing, and can lead to transition to turbulence or boundary layer separation.\u00a0In addition to the mean pressure gradient, the boundary layers on the compressor blade are forced by [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/engineering.jhu.edu\/zaki\/research\/turbomachinery\/\" \/>\n<meta property=\"og:site_name\" content=\"Flow Science and Engineering\" \/>\n<meta property=\"article:modified_time\" content=\"2020-11-13T17:06:47+00:00\" \/>\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\\\/turbomachinery\\\/\",\"url\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/turbomachinery\\\/\",\"name\":\"Turbomachinery - Flow Science and Engineering\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/#website\"},\"datePublished\":\"2014-08-18T19:13:33+00:00\",\"dateModified\":\"2020-11-13T17:06:47+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/turbomachinery\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/turbomachinery\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/zaki\\\/research\\\/turbomachinery\\\/#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\":\"Turbomachinery\"}]},{\"@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":"Turbomachinery - 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\/turbomachinery\/","og_locale":"en_US","og_type":"article","og_title":"Turbomachinery - Flow Science and Engineering","og_description":"This research collaboration aims at simulating, in detail, the role of transition in compressor aerodynamics.\u00a0The flow through the passage is subjected to adverse pressure gradient, which is destabilizing, and can lead to transition to turbulence or boundary layer separation.\u00a0In addition to the mean pressure gradient, the boundary layers on the compressor blade are forced by [&hellip;]","og_url":"https:\/\/engineering.jhu.edu\/zaki\/research\/turbomachinery\/","og_site_name":"Flow Science and Engineering","article_modified_time":"2020-11-13T17:06:47+00:00","twitter_misc":{"Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/engineering.jhu.edu\/zaki\/research\/turbomachinery\/","url":"https:\/\/engineering.jhu.edu\/zaki\/research\/turbomachinery\/","name":"Turbomachinery - Flow Science and Engineering","isPartOf":{"@id":"https:\/\/engineering.jhu.edu\/zaki\/#website"},"datePublished":"2014-08-18T19:13:33+00:00","dateModified":"2020-11-13T17:06:47+00:00","breadcrumb":{"@id":"https:\/\/engineering.jhu.edu\/zaki\/research\/turbomachinery\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/engineering.jhu.edu\/zaki\/research\/turbomachinery\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/engineering.jhu.edu\/zaki\/research\/turbomachinery\/#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":"Turbomachinery"}]},{"@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"}]}},"_links":{"self":[{"href":"https:\/\/engineering.jhu.edu\/zaki\/wp-json\/wp\/v2\/pages\/105","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/engineering.jhu.edu\/zaki\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/engineering.jhu.edu\/zaki\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/engineering.jhu.edu\/zaki\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/engineering.jhu.edu\/zaki\/wp-json\/wp\/v2\/comments?post=105"}],"version-history":[{"count":30,"href":"https:\/\/engineering.jhu.edu\/zaki\/wp-json\/wp\/v2\/pages\/105\/revisions"}],"predecessor-version":[{"id":1973,"href":"https:\/\/engineering.jhu.edu\/zaki\/wp-json\/wp\/v2\/pages\/105\/revisions\/1973"}],"up":[{"embeddable":true,"href":"https:\/\/engineering.jhu.edu\/zaki\/wp-json\/wp\/v2\/pages\/30"}],"wp:attachment":[{"href":"https:\/\/engineering.jhu.edu\/zaki\/wp-json\/wp\/v2\/media?parent=105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}