{"id":31682,"date":"2026-02-15T12:00:00","date_gmt":"2026-02-15T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/comores\/politique\/lart-de-faire-vibrer-les-tourbillons"},"modified":"2026-02-16T02:52:47","modified_gmt":"2026-02-16T02:52:47","slug":"lart-de-faire-vibrer-les-tourbillons","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/lart-de-faire-vibrer-les-tourbillons","title":{"rendered":"L\u2019Art de Faire Vibrer les Tourbillons"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Comores. <\/strong><\/span>Dans un fluide en rotation, la \u00ab quantite\u0301 de rotation \u00bb ne se re\u0301partit pas uniforme\u0301ment: elle se concentre le long de lignes fines appele\u0301es tourbillons (ou vortex). Ces structures, que l\u2019on retrouve dans les tornades, les sillages d\u2019avion ou certains fluides quantiques, ne sont pas rigides.<\/p>\n<p><b>La pre\u0301diction de Lord Kelvin<\/b><\/p>\n<p>De\u0300s la fin du XIXe sie\u0300cle, Lord Kelvin avait pre\u0301dit qu\u2019elles pouvaient supporter des ondes se propageant le long de leur axe. Mais en pratique, ces \u00ab ondes de Kelvin \u00bb sont reste\u0301es difficiles a\u0300 observer de manie\u0300re contro\u0302le\u0301e. Une e\u0301quipe du Laboratoire matie\u0300re et syste\u0300mes complexes (CNRS \u2013 universite\u0301 Paris-Cite\u0301) et du Laboratoire de physique de l\u2019ENS est parvenue a\u0300 lever ce verrou expe\u0301rimental.<\/p>\n<p>Ces physiciens ont conc\u0327u un dispositif capable de stabiliser un vortex d\u2019environ quarante centime\u0300tres de hauteur, en forc\u0327ant l\u2019eau a\u0300 tourner autour d\u2019un orifice central. Le c\u0153ur du tourbillon, occupe\u0301 par une fine colonne d\u2019air, sert de marqueur optique, ce qui permet de suivre pre\u0301cise\u0301ment ses de\u0301formations. En excitant le\u0301ge\u0300rement la surface du fluide a\u0300 l\u2019aide d\u2019un anneau vibrant situe\u0301 au fond de la cuve, l\u2019e\u0301quipe de\u0301clenche des ondes qui se propagent le long du vortex.<\/p>\n<p><b>Le comportement des tornades<\/b><\/p>\n<p>Deux types de modes sont identifie\u0301s: l\u2019un de\u0301place l\u2019axe du tourbillon en une he\u0301lice, l\u2019autre de\u0301forme son c\u0153ur sans en de\u0301placer l\u2019axe. Au-dela\u0300 de la de\u0301monstration expe\u0301rimentale, ces re\u0301sultats ont une porte\u0301e plus large.<\/p>\n<p>En effet, les ondes de Kelvin sont suppose\u0301es jouer un ro\u0302le central dans le transport d\u2019e\u0301nergie au sein des superfluides, mais leur observation y reste tre\u0300s limite\u0301e. Les expe\u0301riences re\u0301alise\u0301es ici offrent un analogue classique permettant de tester ces me\u0301canismes. Elles pourraient e\u0301galement e\u0301clairer certains comportements intermittents des tornades ou la dynamique des vortex dans les sillages d\u2019avion.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Comores<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Comores. Dans un fluide en rotation, la \u00ab quantite\u0301 de rotation \u00bb ne se re\u0301partit pas uniforme\u0301ment: elle se concentre le long de lignes fines appele\u0301es tourbillons (ou vortex). Ces structures, que l\u2019on retrouve dans les tornades, les sillages d\u2019avion ou certains fluides quantiques, ne sont pas rigides. La pre\u0301diction de Lord Kelvin [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":31681,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[45],"class_list":["post-31682","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-comores"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>L\u2019Art de Faire Vibrer les Tourbillons - Comores<\/title>\n<meta name=\"description\" content=\"Dans un fluide en rotation, la \u00ab quantite\u0301 de rotation \u00bb ne se re\u0301partit pas uniforme\u0301ment: elle se concentre le long de ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/lart-de-faire-vibrer-les-tourbillons\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u2019Art de Faire Vibrer les Tourbillons\" \/>\n<meta property=\"og:description\" content=\"Dans un fluide en rotation, la \u00ab quantite\u0301 de rotation \u00bb ne se re\u0301partit pas uniforme\u0301ment: elle se concentre le long de ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/lart-de-faire-vibrer-les-tourbillons\" \/>\n<meta property=\"og:site_name\" content=\"Comores\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-15T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-16T02:52:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/centrafricaine\/sites\/48\/2026\/02\/sm_1771239111.289582.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/lart-de-faire-vibrer-les-tourbillons#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/lart-de-faire-vibrer-les-tourbillons\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/comores\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"L\u2019Art de Faire Vibrer les Tourbillons\",\"datePublished\":\"2026-02-15T12:00:00+00:00\",\"dateModified\":\"2026-02-16T02:52:47+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/lart-de-faire-vibrer-les-tourbillons\"},\"wordCount\":370,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/lart-de-faire-vibrer-les-tourbillons#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/centrafricaine\/sites\/48\/2026\/02\/sm_1771239111.289582.jpg\",\"keywords\":[\"Comores\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/lart-de-faire-vibrer-les-tourbillons#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/lart-de-faire-vibrer-les-tourbillons\",\"url\":\"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/lart-de-faire-vibrer-les-tourbillons\",\"name\":\"L\u2019Art de Faire Vibrer les Tourbillons - 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