{"id":252928,"date":"2023-03-07T21:22:17","date_gmt":"2023-03-07T21:22:17","guid":{"rendered":"\/forum\/?post_type=topic&#038;p=252928"},"modified":"2023-03-07T21:22:17","modified_gmt":"2023-03-07T21:22:17","slug":"incorrect-cl-and-cd-values-across-aoa-range","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/incorrect-cl-and-cd-values-across-aoa-range\/","title":{"rendered":"Incorrect Cl and Cd Values Across AOA Range"},"content":{"rendered":"<p>Hi,<\/p>\n<p>I am continually getting incorrect Cl and Cd values for my simulation. With some simulations, the value I get at 0 Degrees AOA my answers are within 1.5%, however sometimes are out by an order of magnitude.&nbsp;<\/p>\n<p>My simulation is of an Eppler 908 foil, at this point, I am just trying to validate my model against data found on Airfoiltools database. Eventually, I would like to perform simulations of this foil against a multitude of AOA and velocities within water.<\/p>\n<p>However, currently my simulation is in air, velocity 7.1m\/s chord length 0.1m, this gives Reynolds number of 50000. I am using a C shaped mesh. For y+ = 1, my wall spacing was calculated to be 3.9&#215;10^-5. I have attached images to show that my wall spacing is significantly below this threshold.&nbsp;<\/p>\n<p>My settings for the fluent app are attached to an imgur link, as well as the expected output vs. actual output. Any help would be greatly apprecitaed.<\/p>\n<p><a href=\"https:\/\/imgur.com\/gallery\/XOqO2l9\">Imgur Link to relevant images<\/a><\/p>\n","protected":false},"template":"","class_list":["post-252928","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["23.220.96.149"],"_bbp_subscription":["277374","199","15180"],"_btv_view_count":["1478"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["252928"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","15180","277374"],"_bbp_voice_count":["3"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["253114"],"_bbp_last_active_id":["253114"],"_bbp_last_active_time":["2023-03-08 15:59:22"]},"test":"lewisjackbellicloud-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/252928","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\/252928\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=252928"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}