{"id":13374,"date":"2023-10-13T14:38:40","date_gmt":"2023-10-13T14:38:40","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=13374"},"modified":"2024-03-29T11:43:06","modified_gmt":"2024-03-29T11:43:06","slug":"roughness-induced-instabilities-leading-to-transition-in-a-capsule-boundary-layer-under-re-entry-conditions","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2023\/10\/13\/roughness-induced-instabilities-leading-to-transition-in-a-capsule-boundary-layer-under-re-entry-conditions\/","title":{"rendered":"Roughness-induced instabilities leading to transition in a capsule boundary-layer under re-entry conditions"},"content":{"rendered":"\n<p><strong>Christian Stemmer\u00a0 , Antonio Di Giovanni<\/strong><\/p>\n\n\n\n<p><strong>DOI Number XXX-YYY-ZZZ<\/strong><\/p>\n\n\n\n<p><strong>Conference Number HiSST 2018-1950863<\/strong><\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>We investigate roughness-induced transition scenarios for the capsule boundary layer in re-entry type scenarios with Direct Numerical Simulations (DNS). The effect of chemical equilibrium as well as chemical and\/or thermal non-equilibrium on the disturbance development in the wake of the distributed roughness patch is investigated. DNS calculations are undertaken to show the non-linear evolution of the roughness wake and its interaction with unsteady disturbances. For the modelling of the high-temperature gas effects with chemical equilibrium as well as with chemical and thermal non-equilibrium, the amplification of the unstable modes does not enter the non-linear stage and transition does not take place. For the present flow parameters of a typical re-entry case, the interactions of the roughness patch with the distributed roughness leads to laminar-turbulent breakdown for the case of chemical non-equilibrium.<\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2023\/10\/hisst-2018_1950863.pdf\" data-type=\"link\" data-id=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2023\/10\/hisst-2018_1950863.pdf\">Read the full paper &gt; <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Christian Stemmer\u00a0 , Antonio Di Giovanni<\/b><\/p>\n<p>DOI Number XXX-YYY-ZZZ<br \/>\nConference Number HiSST 2018-1950863<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[193,996,994,198,1000,197],"tags":[679,434,678,597,596],"class_list":["post-13374","post","type-post","status-publish","format-standard","hentry","category-boundary-layer-control","category-high-speed-aerodynamics-and-aerothermodynamics","category-hisst-2018","category-hypersonic-aerodynamics","category-operations-and-environment","category-transition-to-turbulence","tag-capsule","tag-hisst-2018","tag-hypersonic-boundary-layer-flow","tag-laminar-turbulent-transition","tag-roughness","category-193","category-996","category-994","category-198","category-1000","category-197","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/13374","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=13374"}],"version-history":[{"count":2,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/13374\/revisions"}],"predecessor-version":[{"id":15869,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/13374\/revisions\/15869"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=13374"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=13374"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=13374"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}