{"id":394606,"date":"2024-11-20T17:49:40","date_gmt":"2024-11-20T17:49:40","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/incorrect-aerodynamic-coefficients-cd-cm-and-cl\/"},"modified":"2024-11-20T17:49:40","modified_gmt":"2024-11-20T17:49:40","slug":"incorrect-aerodynamic-coefficients-cd-cm-and-cl","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/incorrect-aerodynamic-coefficients-cd-cm-and-cl\/","title":{"rendered":"Incorrect aerodynamic coefficients (Cd, Cm and Cl)"},"content":{"rendered":"<p>&lt;p&gt;Hi all,&nbsp;&lt;\/p&gt;&lt;p&gt;I hope you&rsquo;re all having a great day!&lt;\/p&gt;&lt;p&gt;I&rsquo;m studying aerodynamic instabilities in solar trackers. For this, I&rsquo;m conducting a parametric study of a 2D model of the solar panels. The parameters being varied are the inlet velocity and the angle of attack. The issue arises when I try to determine the aerodynamic coefficients, as the values make no sense for any angle. I&rsquo;m performing a transient study using the SST k-omega turbulence model.&lt;\/p&gt;&lt;p&gt;I&rsquo;ll attach some photos for better understanding. (Clarification: 180&ordm; would be totally horizontal, 160&ordm; means an inclination of 20&ordm; (180-120=160).)&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/20-11-2024-1732124578-mceclip1.png\" width=\"761\" height=\"184\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/20-11-2024-1732124652-mceclip2.png\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/20-11-2024-1732124325-mceclip0.png\" width=\"531\" height=\"258\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-394606","topic","type-topic","status-publish","hentry","topic-tag-2d-cfd-1","topic-tag-aerodynamics","topic-tag-angle","topic-tag-drag-coefficient","topic-tag-drag-force","topic-tag-lift-coefficient","topic-tag-moment-coefficient"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi all, I hope you\u2019re all having a great day!I\u2019m studying aerodynamic instabilities in solar trackers. 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The issue arises when I try to determine the aerodynamic coefficients, as\" \/>\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\\\/topic\\\/incorrect-aerodynamic-coefficients-cd-cm-and-cl\\\/#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\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/drag-force\\\/#listItem\",\"name\":\"drag-force\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/drag-force\\\/#listItem\",\"position\":3,\"name\":\"drag-force\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/drag-force\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/incorrect-aerodynamic-coefficients-cd-cm-and-cl\\\/#listItem\",\"name\":\"Incorrect aerodynamic coefficients (Cd, Cm and Cl)\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/incorrect-aerodynamic-coefficients-cd-cm-and-cl\\\/#listItem\",\"position\":4,\"name\":\"Incorrect aerodynamic coefficients (Cd, Cm and Cl)\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/drag-force\\\/#listItem\",\"name\":\"drag-force\"}}]},{\"@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\\\/topic\\\/incorrect-aerodynamic-coefficients-cd-cm-and-cl\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/incorrect-aerodynamic-coefficients-cd-cm-and-cl\\\/\",\"name\":\"Incorrect aerodynamic coefficients (Cd, Cm and Cl) | Ansys Learning Forum\",\"description\":\"Hi all, I hope you\\u2019re all having a great day!I\\u2019m studying aerodynamic instabilities in solar trackers. 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The issue arises when I try to determine the aerodynamic coefficients, as"},"aioseo_meta_data":{"post_id":"394606","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2025-10-19 09:23:55","updated":"2026-09-17 11:54:21","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/drag-force\/\" title=\"drag-force\">drag-force<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tIncorrect aerodynamic coefficients (Cd, Cm and Cl)\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/forum\/topics\/"},{"label":"drag-force","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/drag-force\/"},{"label":"Incorrect aerodynamic coefficients (Cd, Cm and Cl)","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/incorrect-aerodynamic-coefficients-cd-cm-and-cl\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["483579","199"],"_bbp_author_ip":["2a0c:5a85:6605:8d00:8072:da73:95c2:937c"],"_btv_view_count":["323"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["394606"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","483579"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["394735"],"_bbp_last_active_id":["394735"],"_bbp_last_active_time":["2024-11-21 11:34:44"]},"test":"alextorres000uma-es"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/394606","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/394606\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=394606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}