{"id":4005,"date":"2020-06-03T13:20:27","date_gmt":"2020-06-03T17:20:27","guid":{"rendered":"https:\/\/engineering.jhu.edu\/lefd\/?page_id=4005"},"modified":"2020-06-03T13:45:56","modified_gmt":"2020-06-03T17:45:56","slug":"high-resolution-piv-experiment","status":"publish","type":"page","link":"https:\/\/engineering.jhu.edu\/lefd\/high-resolution-piv-experiment\/","title":{"rendered":"High Resolution PIV Experiment"},"content":{"rendered":"<p><a href=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/7002.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3979 alignleft\" src=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/7002.png\" alt=\"\" width=\"928\" height=\"373\" srcset=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/7002.png 928w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/7002-300x121.png 300w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/7002-200x80.png 200w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/7002-768x309.png 768w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/7002-150x60.png 150w\" sizes=\"auto, (max-width: 928px) 100vw, 928px\" \/><\/a><\/p>\n<h3>Mean flow<\/h3>\n<p><a href=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8001.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-4008 aligncenter\" src=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8001.png\" alt=\"\" width=\"691\" height=\"177\" srcset=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8001.png 1228w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8001-300x77.png 300w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8001-1024x263.png 1024w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8001-200x51.png 200w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8001-768x197.png 768w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8001-150x38.png 150w\" sizes=\"auto, (max-width: 691px) 100vw, 691px\" \/><\/a><strong>Spatial variation of mean flow near the wall.<\/strong><\/p>\n<ul>\n<li>Flows follow the meandering path in the interstices.<\/li>\n<li>The lowest <i>U <\/i>occurs above the forward crestline, maximum<i> U<\/i> occurs above the center of side ridges.<\/li>\n<li>Maximum <i>W<\/i> occurs above the center of forward face.<\/li>\n<\/ul>\n<h3>Turbulence Statistics<\/h3>\n<p><a href=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8002.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-4011 size-large\" src=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8002-1024x204.png\" alt=\"\" width=\"1024\" height=\"204\" srcset=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8002-1024x204.png 1024w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8002-300x60.png 300w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8002-200x40.png 200w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8002-768x153.png 768w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8002-1536x306.png 1536w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8002-150x30.png 150w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8002.png 1581w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><strong>Spatial variation of Reynolds stresses.<\/strong><\/p>\n<ul>\n<li>Substantial spatial variation of Reynolds stresses occurs within 2<i>k.<\/i><\/li>\n<li>&lt;u\u2019u\u2019&gt; shows the shooting-up pattern across the entire roughness wavelength.<\/li>\n<li>The shooting-up pattern for -&lt;u\u2019v\u2019&gt; and &lt;v\u2019v\u2019&gt; is localized at the forward face of the roughness.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8003.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-4015 size-full\" src=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8003.png\" alt=\"\" width=\"816\" height=\"316\" srcset=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8003.png 816w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8003-300x116.png 300w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8003-200x77.png 200w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8003-768x297.png 768w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8003-150x58.png 150w\" sizes=\"auto, (max-width: 816px) 100vw, 816px\" \/><\/a><\/p>\n<p><strong>TKE production<\/strong><\/p>\n<ul>\n<li>Maximal production occurs above the forward face of pyramid.<\/li>\n<li>The spatial variation is dictated by the <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/me.jhu.edu\/lefd\/hpiv\/RoughWallProject\/index_roughwall_files\/image14311.gif\" width=\"93\" height=\"19\" \/><\/li>\n<\/ul>\n<p><a href=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8004.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-4017 size-large\" src=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8004-1024x211.png\" alt=\"\" width=\"1024\" height=\"211\" srcset=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8004-1024x211.png 1024w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8004-300x62.png 300w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8004-200x41.png 200w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8004-768x158.png 768w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8004-1536x317.png 1536w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8004-150x31.png 150w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8004.png 1557w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><strong>TKE budget terms<\/strong><\/p>\n<ul>\n<li>Dissipation is 50% of the true dissipation due to limited out-of-plane resolution.<\/li>\n<li>Both production and dissipation very near the wall.<\/li>\n<li>In the outer-layer, the dissipation is higher than the production.<\/li>\n<li>Transport term is only substantial below ~ 2<i>k.<\/i><\/li>\n<\/ul>\n<h3>Spatial TKE spectra<\/h3>\n<p><a href=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8005.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-4019 size-full alignleft\" src=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8005.png\" alt=\"\" width=\"1266\" height=\"320\" srcset=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8005.png 1266w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8005-300x76.png 300w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8005-1024x259.png 1024w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8005-200x51.png 200w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8005-768x194.png 768w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8005-150x38.png 150w\" sizes=\"auto, (max-width: 1266px) 100vw, 1266px\" \/><\/a><\/p>\n<p><strong>TKE energy spectra<\/strong><\/p>\n<ul>\n<li>Growing contribution of large scale turbulence with increasing distance from the wall.<\/li>\n<li>Spectra flatten indicating excessive energy in <i>k-<\/i>3<i>k<\/i> range.<\/li>\n<li>The same trend observed in the ocean boundary layer measurements. (Hackett et al. JGR, 2010)<\/li>\n<\/ul>\n<p><a href=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8006.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4020\" src=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8006.png\" alt=\"\" width=\"929\" height=\"373\" srcset=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8006.png 929w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8006-300x120.png 300w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8006-200x80.png 200w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8006-768x308.png 768w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8006-150x60.png 150w\" sizes=\"auto, (max-width: 929px) 100vw, 929px\" \/><\/a><strong>Compensated energy spectra<\/strong><\/p>\n<ul>\n<li>Spectra bump appears distinct peaks in compensated spectra.<\/li>\n<li>Low wavenumber spectral peaks appear in the outer-layer.<\/li>\n<\/ul>\n<h3>Sample of Instantaneous realizations<\/h3>\n<p><a href=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8007.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4021\" src=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8007.png\" alt=\"\" width=\"1497\" height=\"476\" srcset=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8007.png 1497w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8007-300x95.png 300w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8007-1024x326.png 1024w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8007-200x64.png 200w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8007-768x244.png 768w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8007-150x48.png 150w\" sizes=\"auto, (max-width: 1497px) 100vw, 1497px\" \/><\/a><strong>Instantaneous realizations<\/strong><\/p>\n<ul>\n<li>Large scale shear layer marked by CW vortices can be observed across the entire domain.<\/li>\n<li>Near-wall vortices appear to be lifted by the large scale structure in the outer-layer.<\/li>\n<\/ul>\n<h3>Conditional averaging<\/h3>\n<p><a href=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8008.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4024\" src=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8008.png\" alt=\"\" width=\"1422\" height=\"312\" srcset=\"https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8008.png 1422w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8008-300x66.png 300w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8008-1024x225.png 1024w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8008-200x44.png 200w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8008-768x169.png 768w, https:\/\/engineering.jhu.edu\/lefd\/wp-content\/uploads\/2020\/06\/8008-150x33.png 150w\" sizes=\"auto, (max-width: 1422px) 100vw, 1422px\" \/><\/a><strong>Instantaneous realizations<\/strong><\/p>\n<ul>\n<li>Large scale shear layer marked by CW vortices can be observed across the entire domain.<\/li>\n<li>Near-wall vortices appear to be lifted by the large scale structure in the outer-layer.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Mean flow Spatial variation of mean flow near the wall. Flows follow the meandering path in the interstices. The lowest U occurs above the forward crestline, maximum U occurs above the center of side ridges. Maximum W occurs above the &hellip; <a href=\"https:\/\/engineering.jhu.edu\/lefd\/high-resolution-piv-experiment\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":190,"featured_media":0,"parent":0,"menu_order":0,"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-4005","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>High Resolution PIV Experiment - Laboratory for Experimental Fluid Dynamics<\/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\/lefd\/high-resolution-piv-experiment\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"High Resolution PIV Experiment - Laboratory for Experimental Fluid Dynamics\" \/>\n<meta property=\"og:description\" content=\"Mean flow Spatial variation of mean flow near the wall. 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