{"id":318166,"date":"2023-11-17T11:40:27","date_gmt":"2023-11-17T11:40:27","guid":{"rendered":"\/forum\/forums\/topic\/validation-of-airfoil-lift-and-drag-coefficients\/"},"modified":"2023-11-30T12:18:34","modified_gmt":"2023-11-30T12:18:34","slug":"validation-of-airfoil-lift-and-drag-coefficients","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/validation-of-airfoil-lift-and-drag-coefficients\/","title":{"rendered":"Validation of airfoil Lift and Drag coefficients"},"content":{"rendered":"<p><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">Hello friends<\/span><\/span><\/span>,<\/p>\n<p><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">I am trying to validate the lift and drag coefficients of a symmetrical 3D airfoil.<\/span><\/span> <span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">After studying the independence of the solution from the network, I chose the final network and proceeded to obtain the lift and drag coefficients at different angles of attack.<\/span><\/span> <span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">Incompressible flow and Re=120,000.<\/span><\/span><\/span><\/p>\n<p><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">I created the structure mesh with hexahedral elements in ICEM as shown below:<\/span><\/span><\/span><\/p>\n<p style=\"padding-left: 80px\"><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">The above network has &nbsp;Y+&lt;1 &nbsp;and has KW SST turbulence model.<\/span><\/span><\/span><\/p>\n<p style=\"padding-left: 80px\"><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">I used the following boundary conditions:<\/span><\/span><\/span><\/p>\n<p style=\"padding-left: 80px\"><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\"><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/17-11-2023-1700217309-aaaaaaaaaaa.png\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/17-11-2023-1700217309-aaaaaaaaaaa.png\" alt=\"\" width=\"880\" height=\"374\"><\/a><\/span><\/span><\/span><\/p>\n<p style=\"padding-left: 80px\">&nbsp;<\/p>\n<p style=\"padding-left: 80px\"><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">Now, after calculating the lift and drag coefficients at different angles of attack, I drew its graphs as follows: (Blue curves)<br \/><\/span><\/span><\/span><\/p>\n<p style=\"padding-left: 120px\"><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\"><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/17-11-2023-1700217480-1.PNG\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/17-11-2023-1700217480-1.PNG\" alt=\"\" width=\"697\" height=\"197\"><\/a><\/span><\/span><\/span><\/p>\n<p><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">According to the figure above, the lift coefficient has a very large error compared to the experimental results, while the drag coefficient has a smaller error.<\/span><\/span><\/span><\/p>\n<p><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">Do you guys think this is a mesh issue or a setup issue?<\/span><\/span><\/span><\/p>\n<p><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">Thanks in advance<\/span><\/span><\/span><\/p>\n<p><span class=\"HwtZe\" lang=\"en\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">Regards<\/span><\/span><\/span><\/p>\n","protected":false},"template":"","class_list":["post-318166","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["17026","13659"],"_bbp_author_ip":["96.7.218.223"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["722"],"_edit_lock":["1701346662:211314"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["318166"],"_bbp_forum_id":["27792"],"_bbp_engagement":["13659","17026"],"_bbp_voice_count":["2"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["319795"],"_bbp_last_active_id":["319795"],"_bbp_last_active_time":["2023-11-28 14:19:42"]},"test":"a-karimi8457gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/318166","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\/318166\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=318166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}