{"id":28637,"date":"2018-01-30T20:40:36","date_gmt":"2018-01-30T20:40:36","guid":{"rendered":"\/forum\/forums\/topic\/high-lift-coefficient-and-weird-pressure-coefficient-on-cfd-fluent\/"},"modified":"2018-01-30T20:40:36","modified_gmt":"2018-01-30T20:40:36","slug":"high-lift-coefficient-and-weird-pressure-coefficient-on-cfd-fluent","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-lift-coefficient-and-weird-pressure-coefficient-on-cfd-fluent\/","title":{"rendered":"high lift coefficient and weird pressure coefficient on cfd fluent"},"content":{"rendered":"<p>i had a very high lift coefficient and the pressure coefficient does not looks right. This is the fluent setup: 1) i am using C-domain with 40,000 mesh elements with 40,400 nodes. 2) i am using density-based since i am doing a test with high speed flow where the mach number is above one. 3) model: k-epsilon standard. 4) Air properties, density is in ideal-gas. 5) Cell-zone condition: the pressure gauge is 101325 Pa 6) i am using pressure far-field, the inputs are: 0 pressure gauge; Mach = 2 ; AOA = 1 degree. 7) the solution methods and controls remain default. <img decoding=\"async\" src=\"\/bigeyes.gif\" width=\"\" height=\"\" alt=\"8)\" title=\"8)\" class=\"bbcode_smiley\" \/> i ran the iteration between 500-1000<\/p>\n<p>This were the method i get the lift coefficient. Under the Reports &gt; Forces &gt; x ( -ve sin 1) ; y (+ve cos 1). This will print out on the console, and the lift force was about 11 KN, i will put this value into excel and calculate the lift coefficient by rearranges the lift equation. which is about Cl= 11.0 ++&nbsp;<\/p>\n<p><\/p>\n<p>I am seeking for help from my lecturer, he can&#8217;t help me either since he is not familiar in supersonic flow conditions.&nbsp;<img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/a3387d85-bd12-431e-a711-a878014ad604\/4a09db94-d23e-4813-a224-a8780152b3a5_meshing.jpg?width=690&amp;upscale=false\" alt=\"My biconvex mesh\"><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/a3387d85-bd12-431e-a711-a878014ad604\/7d52ecef-0b76-4a3b-9bbb-a8780152d615_zoomed-mesh.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/a3387d85-bd12-431e-a711-a878014ad604\/ff7139ee-0e1d-4ab3-ab53-a87801547fef_lift.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>The Lift force: 11,342.087 N, its very high&#8230; really needs help<\/p>\n","protected":false},"template":"","class_list":["post-28637","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["804"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0","0","0","0"],"_btv_view_count":["1664"],"_bbp_subscription":["235732"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["28637"],"_bbp_forum_id":["27792"],"_bbp_engagement":["154844","155759"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["56368"],"_bbp_last_active_id":["56368"],"_bbp_last_active_time":["2018-01-31 00:49:10"]},"test":"keans0018"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/28637","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\/28637\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=28637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}