{"id":44576,"date":"2020-05-30T16:07:15","date_gmt":"2020-05-30T16:07:15","guid":{"rendered":"\/forum\/forums\/topic\/oscillation-in-residuals-and-force-coefficient-plots-2\/"},"modified":"2020-05-30T16:07:15","modified_gmt":"2020-05-30T16:07:15","slug":"oscillation-in-residuals-and-force-coefficient-plots-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/oscillation-in-residuals-and-force-coefficient-plots-2\/","title":{"rendered":"oscillation in residuals and force coefficient plots"},"content":{"rendered":"<p>I am simulating flow around 2D hydrofoil in ansys fluent.<\/p>\n<p><\/p>\n<p>I am doing this for various angle of attacks between 0 to 20 degrees. the results are ok until 12 degree but after that residuals and lift and drag coefficients plots became oscillating. how can I solve this problem?<\/p>\n<p><\/p>\n<p>for more information:<\/p>\n<p><\/p>\n<p>the model is k-epsilon (realizable and standard wall functions). scheme is coupled and gradient option is green-gauss cell based. pressure, momentum, turbulent kinetic energy and turbulent dissipation rate are chosen second order.<\/p>\n<p><\/p>\n<p>screen shots of oscillating plots are uploaded below<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/ad641752-fa73-47c7-bd8b-abca00d68e2e\/a9cc204f-6ee7-456a-88f0-abcb01097f15_capture1.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/ad641752-fa73-47c7-bd8b-abca00d68e2e\/dabf65f3-3bfb-4202-b08a-abcb010990e2_capture2.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/ad641752-fa73-47c7-bd8b-abca00d68e2e\/1b26546a-5c5d-4896-89bf-abcb0109a507_capture3.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-44576","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["16757"],"_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"],"_btv_view_count":["1819"],"_bbp_subscription":["251976"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["44576"],"_bbp_forum_id":["27792"],"_bbp_engagement":["59","177839"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["116267"],"_bbp_last_active_id":["116267"],"_bbp_last_active_time":["2020-06-01 04:06:14"]},"test":"shayanmehr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/44576","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\/44576\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=44576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}