{"id":16473,"date":"2024-04-26T14:35:51","date_gmt":"2024-04-26T14:35:51","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=16473"},"modified":"2024-04-26T14:35:52","modified_gmt":"2024-04-26T14:35:52","slug":"on-the-use-of-random-inflow-disturbances-to-simulate-transitional-hypersonic-wind-tunnel-experiments","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2024\/04\/26\/on-the-use-of-random-inflow-disturbances-to-simulate-transitional-hypersonic-wind-tunnel-experiments\/","title":{"rendered":"On the use of random inflow disturbances to simulate transitional hypersonic wind tunnel experiments.\u00a0"},"content":{"rendered":"\n<p><strong>Mathieu Lugrin<\/strong><\/p>\n\n\n\n<p><strong>DOI Number XXX-YYY-ZZZ<\/strong><\/p>\n\n\n\n<p><strong>Conference Number HiSST-2022-449<\/strong><\/p>\n\n\n\n<p>A direct numerical simulation of the transitional flow around an axisymetrical compression ramp at Mach<br>5 is conducted for flow conditions corresponding to an experiment of Lugrin et al., 2022. The flow<br>is excited using a random forcing approach (white noise on density), with a noise magnitude chosen<br>to match the time averaged separation size data from the experiments. Unsteady numerical and experimental results are then compared to assess the ability of the random forcing approach to simulate<br>the receptivity process in conventional wind tunnel experiments for such complex flow where multiple<br>mechanisms are present. The computation reproduces the experimental mean flow and turbulent spectrum very precisely. However, the injected noise is found to be biased towards high-frequency and not<br>representative of the R2Ch free-stream fluctuations, which leads to strong discrepancies in the pressure<br>fluctuations spectrum in the laminar part of the flow. As such, the random forcing approach may introduce a bias towards some non-linear breakdown mechanisms that may be different from the one at<br>play in the experiments.<\/p>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2023\/10\/HiSST-2022-449.pdf\" data-type=\"link\" data-id=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2023\/10\/HiSST-2022-449.pdf\">Read the full paper > <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Mathieu Lugrin<\/b><\/p>\n<p>DOI Number XXX-YYY-ZZZ<\/p>\n<p>Conference Number HiSST-2022-449<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[993,1008],"tags":[],"class_list":["post-16473","post","type-post","status-publish","format-standard","hentry","category-events","category-high-speed-aerodynamics-and-aerothermodynamics-hisst-2022","category-993","category-1008","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16473","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/comments?post=16473"}],"version-history":[{"count":1,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16473\/revisions"}],"predecessor-version":[{"id":16474,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16473\/revisions\/16474"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=16473"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=16473"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=16473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}