{"id":203,"date":"2021-03-09T14:09:55","date_gmt":"2021-03-09T14:09:55","guid":{"rendered":"http:\/\/generic.wordpress.soton.ac.uk\/isvr\/?p=203"},"modified":"2021-06-22T21:04:01","modified_gmt":"2021-06-22T20:04:01","slug":"aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number","status":"publish","type":"post","link":"https:\/\/generic.wordpress.soton.ac.uk\/isvr\/aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number\/","title":{"rendered":"Aerofoil dipole noise due to flow separation and stall at a low Reynolds number"},"content":{"rendered":"\n<h3 class=\"has-text-align-center wp-block-heading\"> <em>International Journal of Heat and Fluid Flow <\/em> <\/h3>\n\n\n\n<h4 class=\"has-text-align-center wp-block-heading\"><em>Turner J.M. &amp; Kim J.-W.  <\/em> <\/h4>\n\n\n\n<p class=\"has-text-align-center\">Aircraft wings and wind-turbine blades generate aerodynamic noise and such noise becomes louder when they are operating at an off-design condition (i.e. a high incidence angle against the oncoming flow). This is due to the wing\/blade section undergoes flow separation and stall which results in a substantially intensified turbulence, hence strong fluctuations in pressure on the surface of the wing\/blade. Despite the fact that it is a significant problem for aircraft in take-off\/landing and wind turbines in a gusty condition, the level of understanding on the stall noise mechanisms is currently low. In this paper, a detailed computational simulation is carried out in order to identify and explain some of the fundamental mechanisms of stall noise generation by using a NACA0012 aerofoil at a Reynolds number of 50,000 and a Mach number of 0.4. A highly accurate supercomputer code, <a href=\"https:\/\/www.southampton.ac.uk\/engineering\/about\/staff\/jwk.page\">CANARD <\/a>(Compressible Aerodynamics &amp; Aeroacoustics Research coDe) developed at the University of Southampton has been used for this study. Several key findings made in this paper include the radiated noise directivity, wall pressure characteristics and key flow features for noise generation, all differing considerably from those in pre-stall conditions. This paper is one of the invited articles for TSFP (Turbulence and Shear Flow Phenomena) Special Issue in the International Journal of Heat and Fluid Flow.<\/p>\n\n\n\n<hr class=\"wp-block-separator is-style-dots\" \/>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"2000\" height=\"686\" src=\"https:\/\/generic.wordpress.soton.ac.uk\/isvr\/wp-content\/uploads\/sites\/413\/2021\/03\/TurnerKim_IJHFF-002.png\" alt=\"\" class=\"wp-image-204\" srcset=\"https:\/\/generic.wordpress.soton.ac.uk\/isvr\/wp-content\/uploads\/sites\/413\/2021\/03\/TurnerKim_IJHFF-002.png 2000w, https:\/\/generic.wordpress.soton.ac.uk\/isvr\/wp-content\/uploads\/sites\/413\/2021\/03\/TurnerKim_IJHFF-002-300x103.png 300w, https:\/\/generic.wordpress.soton.ac.uk\/isvr\/wp-content\/uploads\/sites\/413\/2021\/03\/TurnerKim_IJHFF-002-768x263.png 768w, https:\/\/generic.wordpress.soton.ac.uk\/isvr\/wp-content\/uploads\/sites\/413\/2021\/03\/TurnerKim_IJHFF-002-1024x351.png 1024w, https:\/\/generic.wordpress.soton.ac.uk\/isvr\/wp-content\/uploads\/sites\/413\/2021\/03\/TurnerKim_IJHFF-002-1568x538.png 1568w\" sizes=\"auto, (max-width: 2000px) 100vw, 2000px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Direct numerical simulation (DNS) of aerodynamic noise emanating from a stalled NACA0012 aerofoil\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/em-dVpf2yiM?start=4&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<div class=\"wp-block-button aligncenter\"><a class=\"wp-block-button__link\" href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0142727X20304732\">Go to the publication<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>International Journal of Heat and Fluid Flow Turner J.M. &amp; Kim J.-W. Aircraft wings and wind-turbine blades generate aerodynamic noise and such noise becomes louder when they are operating at an off-design condition (i.e. a high incidence angle against the oncoming flow). This is due to the wing\/blade section undergoes flow separation and stall which &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/generic.wordpress.soton.ac.uk\/isvr\/aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Aerofoil dipole noise due to flow separation and stall at a low Reynolds number&#8221;<\/span><\/a><\/p>\n","protected":false},"author":4860,"featured_media":204,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[12],"class_list":["post-203","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research","tag-research-output","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aerofoil dipole noise due to flow separation and stall at a low Reynolds number - Institute of Sound and Vibration Research<\/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:\/\/generic.wordpress.soton.ac.uk\/isvr\/aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aerofoil dipole noise due to flow separation and stall at a low Reynolds number - Institute of Sound and Vibration Research\" \/>\n<meta property=\"og:description\" content=\"International Journal of Heat and Fluid Flow Turner J.M. &amp; Kim J.-W. Aircraft wings and wind-turbine blades generate aerodynamic noise and such noise becomes louder when they are operating at an off-design condition (i.e. a high incidence angle against the oncoming flow). This is due to the wing\/blade section undergoes flow separation and stall which &hellip; Continue reading &quot;Aerofoil dipole noise due to flow separation and stall at a low Reynolds number&quot;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/generic.wordpress.soton.ac.uk\/isvr\/aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number\/\" \/>\n<meta property=\"og:site_name\" content=\"Institute of Sound and Vibration Research\" \/>\n<meta property=\"article:published_time\" content=\"2021-03-09T14:09:55+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-06-22T20:04:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/generic.wordpress.soton.ac.uk\/isvr\/wp-content\/uploads\/sites\/413\/2021\/03\/TurnerKim_IJHFF-002.png\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"686\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Vanui Mardanyan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ISVRSouthampton\" \/>\n<meta name=\"twitter:site\" content=\"@ISVRSouthampton\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Vanui Mardanyan\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/isvr\\\/aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/isvr\\\/aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number\\\/\"},\"author\":{\"name\":\"Vanui Mardanyan\",\"@id\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/isvr\\\/#\\\/schema\\\/person\\\/b27ebc581765f5c4ad0eab378d7d7897\"},\"headline\":\"Aerofoil dipole noise due to flow separation and stall at a low Reynolds number\",\"datePublished\":\"2021-03-09T14:09:55+00:00\",\"dateModified\":\"2021-06-22T20:04:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/isvr\\\/aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number\\\/\"},\"wordCount\":259,\"image\":{\"@id\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/isvr\\\/aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/isvr\\\/wp-content\\\/uploads\\\/sites\\\/413\\\/2021\\\/03\\\/TurnerKim_IJHFF-002.png\",\"keywords\":[\"Research Output\"],\"articleSection\":[\"Research\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/isvr\\\/aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number\\\/\",\"url\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/isvr\\\/aerofoil-dipole-noise-due-to-flow-separation-and-stall-at-a-low-reynolds-number\\\/\",\"name\":\"Aerofoil dipole noise due to flow separation and stall at a low Reynolds number - 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Aircraft wings and wind-turbine blades generate aerodynamic noise and such noise becomes louder when they are operating at an off-design condition (i.e. a high incidence angle against the oncoming flow). 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