{"id":28471,"date":"2017-12-06T23:34:55","date_gmt":"2017-12-06T23:34:55","guid":{"rendered":"\/forum\/forums\/topic\/messy-residuals-for-2d-flow-over-an-airfoil\/"},"modified":"2017-12-06T23:34:55","modified_gmt":"2017-12-06T23:34:55","slug":"messy-residuals-for-2d-flow-over-an-airfoil","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/messy-residuals-for-2d-flow-over-an-airfoil\/","title":{"rendered":"Messy Residuals for 2D Flow over an Airfoil"},"content":{"rendered":"<p>Good evening,&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>I am having trouble getting my residuals to decrease nicely with no oscillation. I have refined my mesh numerous times, as well as increased the flow domain, especially moving the outlet further far field from the airfoil but to no avail. I have attached a picture of the residuals plot that I get.. And this is after 5000 iterations. I have also included a photo of my mesh which I believe to be in good condition. The orthogonal quality is good and the skewness is below 0.95.&nbsp;<\/p>\n<p><\/p>\n<p>Properties of the 2 Element Airfoil:&nbsp;<\/p>\n<p><\/p>\n<p>Mainplane &#8211; 0 AoA, Flap &#8211; 25 AoA, Overall chord length &#8211; ~1.2 m<\/p>\n<p><\/p>\n<p>Boundary Conditions:&nbsp;<\/p>\n<p><\/p>\n<p>Velocity Inlet &#8211; 14 m\/s in the x-direction<\/p>\n<p><\/p>\n<p>Top and Bottom &#8211; Stationary Wall with Specified Shear components set at 0<\/p>\n<p><\/p>\n<p>Outlet &#8211; 0 Gauge pressure outlet<\/p>\n<p><\/p>\n<p>The results make physical sense but the residuals are leading me to believe that I shouldn&#8217;t take this values as accurate. This is for my degree project so accuracy is key.&nbsp;<\/p>\n<p><\/p>\n<p>Any help is greatly appreciated. Thank you<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/973a867a-69fb-4538-85a6-a841013ad415\/dc573cc2-e346-43a3-948c-a841018486d0_image.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\/973a867a-69fb-4538-85a6-a841013ad415\/ac202b59-ce07-4d6f-8dcc-a84101849051_1.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\/973a867a-69fb-4538-85a6-a841013ad415\/18bd7a0c-eb76-409a-8e5b-a841018498d0_2.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-28471","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["638"],"_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":["941"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["28471"],"_bbp_forum_id":["27790"],"_bbp_engagement":["154844","155059","155283"],"_bbp_voice_count":["3"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["55971"],"_bbp_last_active_id":["55971"],"_bbp_last_active_time":["2017-12-21 21:23:32"]},"test":"oyallou"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/28471","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\/28471\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=28471"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}