{"id":19286,"date":"2020-04-11T00:56:10","date_gmt":"2020-04-10T22:56:10","guid":{"rendered":"https:\/\/cfdfeaservice.it\/?p=19286"},"modified":"2020-04-11T00:59:28","modified_gmt":"2020-04-10T22:59:28","slug":"turbolenza-ed-inizializzazione","status":"publish","type":"post","link":"https:\/\/cfdfeaservice.it\/index.php\/2020\/04\/11\/turbolenza-ed-inizializzazione\/","title":{"rendered":"Turbolenza ed inizializzazione"},"content":{"rendered":"\n<p>Uno dei problemi pi\u00f9 tipici nell&#8217;utilizzo della CFD riguarda l&#8217;inizializzazione della turbolenza. Gi\u00e0 in passato abbiamo affrontato come <a href=\"https:\/\/cfdfeaservice.it\/index.php\/2018\/03\/21\/come-scegliere-il-modello-di-turbolenza\/\">scegliere un modello di turbolenza<\/a> o un altro. Oggi vediamo meglio come impostarlo.<\/p>\n\n\n\n<p>I dati fondamentali sono due:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Velocit\u00e0 -> detta anche bulk velocity,  \u00e8 la velocit\u00e0 caratteristica della simulazione<\/li><li><a href=\"https:\/\/it.wikipedia.org\/wiki\/Diametro_equivalente\">Diametro idraulico<\/a> -> identifica la dimensione dell&#8217;area &#8220;bagnata&#8221;.  E&#8217; una grandezza che identifica la dimensione caratteristica della nostra simulazione<\/li><\/ul>\n\n\n\n<p>A partire da questi due dati si calcolano le principali variabili collegate ai modelli di turbolenza:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>k -> energia cinetica turbolenta in m2\/s2<\/li><li>epsilon -> dissipazione turbolenta in m2\/s3<\/li><li>omega -> dissipazione turbolenta specifica in 1\/s<\/li><\/ul>\n\n\n\n<p>I modelli di riferimento sono <a href=\"https:\/\/it.wikipedia.org\/wiki\/Modello_k-epsilon\">k-epsilon<\/a> e <a href=\"https:\/\/en.wikipedia.org\/wiki\/SST_(Menter%E2%80%99s_Shear_Stress_Transport)\">k-omega SST<\/a> che rappresentano i due modelli attualmente pi\u00f9 utilizzati in ambito industriale. I campi di applicazione di questo form sono innumerevoli: la turbolenza appare infatti in fenomeni riguardanti l&#8217;ingegneria meccanica, le costruzioni e anche i componenti micro-elettronici. Inoltre grazie al <a href=\"https:\/\/cfdfeaservice.it\/index.php\/cloud-hpc-cloud-computing\/\">cloud HPC<\/a> di CFD FEA SERVICE \u00e8 possibile sfruttare potenza di calcolo on demand per svolgere le vostre simulazioni e comparare i vari modelli tra loro.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\"><style>@media (max-width:480px){#cp_calculatedfieldsf_pform_1{min-height:1314px;}}@media (max-width:768px){#cp_calculatedfieldsf_pform_1{min-height:1004px;}}@media (max-width:1024px){#cp_calculatedfieldsf_pform_1{min-height:889px;}}@media (min-width:1024px){#cp_calculatedfieldsf_pform_1{min-height:826px;}}<\/style><form name=\"cp_calculatedfieldsf_pform_1\" id=\"cp_calculatedfieldsf_pform_1\" action=\"https:\/\/cfdfeaservice.it\/index.php\/2020\/04\/11\/turbolenza-ed-inizializzazione\/\" method=\"post\" enctype=\"multipart\/form-data\" onsubmit=\"return fbuilderjQuery.fbuilder.doValidate(this);\" class=\"cff-form 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[1\\\/s]\",\"predefined\":\"\",\"required\":false,\"exclude\":false,\"size\":\"medium\",\"eq\":\"pow(0.09,-1\\\/4)*pow(fieldname11,1\\\/2)\\\/fieldname8\",\"min\":\"\",\"max\":\"\",\"suffix\":\"\",\"prefix\":\"\",\"decimalsymbol\":\".\",\"groupingsymbol\":\"\",\"readonly\":true,\"currency\":false,\"noEvalIfManual\":true,\"formatDynamically\":false,\"hidefield\":false,\"fBuild\":{},\"parent\":\"fieldname10\"},{\"form_identifier\":\"\",\"name\":\"fieldname14\",\"shortlabel\":\"\",\"index\":9,\"ftype\":\"fCommentArea\",\"userhelp\":\"[1] Bardina, J.E., Huang, P.G., Coakley, T.J. (1997), \\u201cTurbulence Modeling Validation, Testing, and Development\\u201d, NASA Technical Memorandum 110446\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Reference\",\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname15\",\"shortlabel\":\"\",\"index\":10,\"ftype\":\"fCommentArea\",\"userhelp\":\"\\n[2] Wilcox, David C (1998). \\u201cTurbulence Modeling for CFD\\u201d. Second edition. Anaheim: DCW Industries, 1998. pp. 174\\n\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\",\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname16\",\"shortlabel\":\"\",\"index\":11,\"ftype\":\"fCommentArea\",\"userhelp\":\"[3] http:\\\/\\\/www.cfd-online.com\\\/Wiki\\\/Turbulence_free-stream_boundary_conditions\\n\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\",\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname18\",\"shortlabel\":\"\",\"index\":12,\"ftype\":\"fCommentArea\",\"userhelp\":\"[4] Menter, Florian R. \\u201cImproved two-equation k-omega turbulence models for aerodynamic flows.\\u201d (1992).\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\",\"fBuild\":{},\"parent\":\"\"}],{\"0\":{\"title\":\"Turbulence initialization\",\"description\":\"Calculator for turbulence initialization for k-epsilon and k-omega SST turbulence models\",\"formlayout\":\"top_aligned\",\"formtemplate\":\"\",\"evalequations\":1,\"evalequationsevent\":2,\"autocomplete\":1,\"persistence\":0,\"customstyles\":\"\",\"loading_animation\":0,\"animate_form\":0},\"formid\":\"cp_calculatedfieldsf_pform_1\"}];<\/script><\/pre>\n<div id=\"fbuilder\">\n\t\t<div id=\"fbuilder_1\">\n\t\t<div id=\"formheader_1\"><\/div>\n\t\t<div id=\"fieldlist_1\"><\/div>\n\t\t<div class=\"clearer\"><\/div>\n\t<\/div>\n<\/div>\n\t<div id=\"cp_subbtn_1\" class=\"cp_subbtn\" style=\"display:none;\">Submit<\/div><div class=\"clearer\"><\/div>\n\t<input type=\"hidden\" id=\"_cpcff_public_nonce\" name=\"_cpcff_public_nonce\" value=\"1b61951c28\" \/><input type=\"hidden\" name=\"_wp_http_referer\" value=\"\/index.php\/wp-json\/wp\/v2\/posts\/19286\" \/><input type=\"hidden\" name=\"cff_form_start_time\" value=\"itFIG6QH1G6faB3MkShdSA==\"><\/form>\n\t<\/td><\/tr><tr><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n<p><strong>_________________________________<\/strong><\/p>\n<p><strong>CFD FEA Service SRL<\/strong> &egrave; una societ&agrave; di servizi che offre <em>consulenza<\/em> e <em>formazione<\/em> in ambito <strong>ingegneria<\/strong> e <strong>IT<\/strong>. Se questo post\/prodotto ti &egrave; piaciuto ti invitiamo a:<\/p>\n<ul>\n<li>visionare il nostro <a href=\"https:\/\/cfdfeaservice.it\/index.php\/blog\/\" target=\"_blank\" rel=\"noopener\">blog<\/a><\/li>\n<li>visionare i <a href=\"https:\/\/cfdfeaservice.it\/index.php\/prodotti\/\" target=\"_blank\" rel=\"noopener\">software<\/a> disponibili - anche per la formazione<\/li>\n<li>iscriverti alla nostra newsletter<\/li>\n<li>entrare in contatto con noi attraverso la <a href=\"https:\/\/cfdfeaservice.it\/#ribbon\" target=\"_blank\" rel=\"noopener\">pagina contatti<\/a><\/li>\n<\/ul>\n<p>Saremo lieti di seguire le tue richieste e fornire risposte alle tue domande.<\/p>","protected":false},"excerpt":{"rendered":"<p>Uno dei problemi pi\u00f9 tipici nell&#8217;utilizzo della CFD riguarda l&#8217;inizializzazione della turbolenza. Gi\u00e0 in passato abbiamo affrontato come scegliere un modello di turbolenza o un altro. Oggi vediamo meglio come impostarlo. I dati fondamentali sono due: Velocit\u00e0 -> detta anche bulk velocity, \u00e8 la velocit\u00e0 caratteristica della simulazione Diametro idraulico [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":19289,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[26,66],"tags":[],"class_list":["post-19286","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cfd","category-tool"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Turbolenza ed inizializzazione - CFD FEA\/FEM Service<\/title>\n<meta name=\"description\" content=\"Inizializzazione turbolenza con modelli k-epsilon e k-omega SST applicabili ad ogni software CFD. 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