{"id":364506,"date":"2024-04-27T06:59:45","date_gmt":"2024-04-27T06:59:45","guid":{"rendered":"\/forum\/forums\/reply\/364506\/"},"modified":"2024-04-27T06:59:45","modified_gmt":"2024-04-27T06:59:45","slug":"364506","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/364506\/","title":{"rendered":"Reply To: Help needed for steady state thermal analysis of rectangular fins and validation"},"content":{"rendered":"<p>&lt;p&gt;Thanks for the suggestion. Yes, you are correct, I had only used the formula for long fin. So what I did was, instead of declaring convection for both the surface of the engine block as well as the surface of the fin, I declared them seperately, and added a reaction probe result to get the heat flow from fins alone. Coupled with that I calculated fin tip temperature and heat flow for all 3 types of fins (long fin, short fin with insulated end, and short fin with end not insulated) as provided in the databook, with results as shown below:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/27-04-2024-1714200430-straight_rectangular_calculation.png\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;Based on above values, I find that &#8220;short fin, end not insulated&#8221; has values closest to ANSYS results, so I&#8217;m going to go forward with that.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Just one other query: Here&#8217;s a similar engine block but with triangular fins:&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/27-04-2024-1714200851-mceclip0.png\" width=\"687\" height=\"259\" \/>&lt;\/p&gt;&lt;p&gt;Here, I&#8217;m planning to use the same formulas for verification. But I need to know how to find the value of cross-sectional area and perimeter of the cross-section to input in the formula, since unlike rectangular fins, the cross-section changes along the fin here. Appreciate the help!&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-364506","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Thanks for the suggestion. Yes, you are correct, I had only used the formula for long fin. So what I did was, instead of declaring convection for both the surface of the engine block as well as the surface of the fin, I declared them seperately, and added a reaction probe result to get the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/364506\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Help needed for steady state thermal analysis of rectangular fins and validation | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Thanks for the suggestion. Yes, you are correct, I had only used the formula for long fin. So what I did was, instead of declaring convection for both the surface of the engine block as well as the surface of the fin, I declared them seperately, and added a reaction probe result to get the\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/364506\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/27-04-2024-1714200430-straight_rectangular_calculation.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/27-04-2024-1714200430-straight_rectangular_calculation.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-04-27T06:59:45+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-04-27T06:59:45+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Help needed for steady state thermal analysis of rectangular fins and validation | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Thanks for the suggestion. Yes, you are correct, I had only used the formula for long fin. So what I did was, instead of declaring convection for both the surface of the engine block as well as the surface of the fin, I declared them seperately, and added a reaction probe result to get the\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/27-04-2024-1714200430-straight_rectangular_calculation.png\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/364506\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/364506\\\/#listItem\",\"name\":\"Reply To: Help needed for steady state thermal analysis of rectangular fins and validation\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/364506\\\/#listItem\",\"position\":2,\"name\":\"Reply To: Help needed for steady state thermal analysis of rectangular fins and validation\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/364506\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/364506\\\/\",\"name\":\"Reply To: Help needed for steady state thermal analysis of rectangular fins and validation | Ansys Learning Forum\",\"description\":\"Thanks for the suggestion. 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Yes, you are correct, I had only used the formula for long fin. 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Yes, you are correct, I had only used the formula for long fin. So what I did was, instead of declaring convection for both the surface of the engine block as well as the surface of the fin, I declared them seperately, and added a reaction probe result to get the","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/364506\/#breadcrumblist"},"datePublished":"2024-04-27T06:59:45+00:00","dateModified":"2024-04-27T06:59:45+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Reply To: Help needed for steady state thermal analysis of rectangular fins and validation | Ansys Learning Forum","og:description":"Thanks for the suggestion. 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