{"id":40472,"date":"2020-01-28T21:26:47","date_gmt":"2020-01-28T21:26:47","guid":{"rendered":"\/forum\/forums\/topic\/two-phase-flow-in-a-rectangular-domain\/"},"modified":"2020-01-28T21:26:47","modified_gmt":"2020-01-28T21:26:47","slug":"two-phase-flow-in-a-rectangular-domain","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-phase-flow-in-a-rectangular-domain\/","title":{"rendered":"Two phase flow in a rectangular domain"},"content":{"rendered":"<p>I have two phase flow (water vapor and liquid water) in a rectangular domain with inlet of the left and outlet at the bottom. The domain is two dimensional (2D). The domain has gravity acting in the -ve Y direction. I used the Eulerian model for the two phases. I have velocity inlet and pressure outlet BC.&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/8eaa894c-6970-4cf1-8542-a8f6011eede7\/7accdda7-cfdd-473c-a2bd-ab5001616873_fff-6.1-6-01032.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>I follow the following steps:<\/p>\n<p><\/p>\n<p>1. Pseudo-transient analysis with only water-vapor entering the domain. It converges and the results are perfect. The residual plots are as shown below<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/8eaa894c-6970-4cf1-8542-a8f6011eede7\/3daa4ef8-c323-44e7-90a2-ab500162a658_fff-6.1-6-01032.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>2. Pseudo-transient analysis with water-liquid volume fraction of 0.1 at the domain inlet. I cannot get convergence. The solver diverges stating that &#8220;turbulent viscosity ratio&#8221; is higher than 1e5.<\/p>\n<p><\/p>\n<p>I looked into the turbulent viscosity ratio warning. My maximum skewness is 0.02, so the mesh is okay. I tried the recommendation to turn off turbulence for 100 to 200 iterations and turning them back on&#8230;but the solution diverges.<\/p>\n<p><\/p>\n<p>I even tried a laminar case, and the solution diverges! I tried transient case, but the solution diverges!<\/p>\n<p><\/p>\n<p>I would be grateful if the expert users out there could recommend me something!<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Thank you.<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-40472","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["12652"],"_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":["663"],"_bbp_subscription":["236271"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["40472"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","157225"],"_bbp_voice_count":["2"],"_bbp_reply_count":["12"],"_bbp_last_reply_id":["104452"],"_bbp_last_active_id":["104452"],"_bbp_last_active_time":["2020-02-05 16:17:20"]},"test":"ham_nola"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/40472","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\/40472\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=40472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}