{"id":460842,"date":"2026-07-04T21:58:23","date_gmt":"2026-07-04T21:58:23","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-of-continuity-residual-2\/"},"modified":"2026-07-04T21:58:23","modified_gmt":"2026-07-04T21:58:23","slug":"divergence-of-continuity-residual-2","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-of-continuity-residual-2\/","title":{"rendered":"Divergence of Continuity Residual"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p&gt;I was simulating a large stormwater pond model having around 35 million cells. The stormwater pond has two inlets and one outlet.&nbsp;&lt;\/p&gt;&lt;p&gt;The inflromation of my model setup is given below:&nbsp;&lt;\/p&gt;&lt;p&gt;<strong>Time: <\/strong>Steady&lt;\/p&gt;&lt;p&gt;<strong>BCs<\/strong>:&lt;br&gt;Inlet 1: Mass Flow Inlet (3680 kg\/s)&lt;br&gt;Inlet 2: Mass flow Inlet (1360 Kg\/s)&lt;br&gt;Outlet: Outflow&lt;\/p&gt;&lt;p&gt;<strong>Pressure-Velocity Coupling Scheme<\/strong>: SIMPLE&lt;\/p&gt;&lt;p&gt;<strong>Discretization for Momentum and Turblence Equations<\/strong>: First Order Upwind&lt;\/p&gt;&lt;p&gt;<strong>URFs<\/strong>&lt;\/p&gt;&lt;p&gt;Pressure<strong>: <\/strong>0.2&lt;\/p&gt;&lt;p&gt;Momentum<strong>:<\/strong> 0.5&lt;\/p&gt;&lt;p&gt;All other controls: by default&lt;\/p&gt;&lt;p&gt;<strong>Initialization Methods<\/strong>: Standard Initialization computed from all zones&lt;\/p&gt;&lt;p&gt;The issue is that my continuity residual is not still converging even after 2250 iterations. Instead, it&#8217;s drifting upward very slowly (Image attached).&lt;\/p&gt;&lt;p&gt;I would appreciate any guidance from this forum on how to address this issue.&lt;\/p&gt;&lt;p&gt;Thanks.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/07\/04-07-2026-1783202227-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;&lt;br&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-460842","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["460842"],"_bbp_subscription":["647597","199"],"_bbp_author_ip":["128.233.11.111"],"_bbp_last_reply_id":["460959"],"_bbp_last_active_id":["460959"],"_bbp_last_active_time":["2026-07-07 08:55:34"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["647597","199"],"_btv_view_count":["96"],"_bbp_topic_status":["unanswered"]},"test":"jfe293mail-usask-ca"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/460842","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\/460842\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=460842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}