{"id":18889,"date":"2025-02-13T14:20:44","date_gmt":"2025-02-13T14:20:44","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=18889"},"modified":"2025-02-13T14:20:45","modified_gmt":"2025-02-13T14:20:45","slug":"multifidelity-flutter-prediction-using-local-corrections-to-the-generalized-aic","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2025\/02\/13\/multifidelity-flutter-prediction-using-local-corrections-to-the-generalized-aic\/","title":{"rendered":"MULTIFIDELITY FLUTTER PREDICTION USING LOCAL CORRECTIONS TO THE GENERALIZED AIC"},"content":{"rendered":"\n<p><strong>Andrew Thelen, Leifur Leifsson, Philip Beran<\/strong><\/p>\n\n\n\n<p><strong>DOI Number: N\/A<\/strong><\/p>\n\n\n\n<p><strong>Conference number: IFASD-2019-062<\/strong><\/p>\n\n\n\n<p>This work adopts the manifold mapping multi\ufb01delity modeling technique and applies it to frequency-domain \ufb02utter prediction. While this type of multi\ufb01delity model is usually employed in a trust-region optimization framework, the current approach uses it, in combination with the p-k method, to \ufb01nd a critical point in the high-\ufb01delity Mach-reduced frequency space (namely, the matched \ufb02utter point for a given density and sound speed). This is done by \ufb01rst computing a grid of low-\ufb01delity (doublet lattice-based) aerodynamic in\ufb02uence coef\ufb01cients in modal coordinates. After starting at the low-\ufb01delity match point, the process iteratively approaches the high-\ufb01delity (Euler-based) match point using a single Mach and reduced frequency evaluation per iteration. The locally accurate multi\ufb01delity model operates by applying a correction matrix to the low-\ufb01delity response using the changes in highand low-\ufb01delity response vectors between iterations; the correction matrix is computed using the Moore-Penrose pseudoinverse operator, making it reminiscent of various doublet lattice correction methods. When applied to a common test case, the process is shown to converge in 4 to 8 high-\ufb01delity evaluations, depending on the \ufb02uid density and sound speed. For comparison, standard timeand frequency domain methods are estimated to be 3 to 10 times more costly in terms of time steps or frequency evaluations.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1270963820307148\">Read the full paper here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Andrew Thelen, Leifur Leifsson, Philip Beran<\/b><\/p>\n<p>DOI Number: N\/A<\/p>\n<p>Conference number: IFASD-2019-062<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2437,2433],"tags":[2063,2658,975,2891,2890,2889],"class_list":["post-18889","post","type-post","status-publish","format-standard","hentry","category-aeroelastic-optimization","category-1-ifasd-2019","tag-computational-uid-dynamics","tag-doublet-lattice-method","tag-flutter","tag-manifold-mapping","tag-metamodeling","tag-multidelity-methods","category-2437","category-2433","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/18889","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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/comments?post=18889"}],"version-history":[{"count":1,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/18889\/revisions"}],"predecessor-version":[{"id":18891,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/18889\/revisions\/18891"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=18889"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=18889"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=18889"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}