{"id":42939,"date":"2020-04-18T18:59:12","date_gmt":"2020-04-18T18:59:12","guid":{"rendered":"\/forum\/forums\/topic\/eulerian-eulerian-turbulent-two-fluid-model-is-not-converging\/"},"modified":"2020-04-18T18:59:12","modified_gmt":"2020-04-18T18:59:12","slug":"eulerian-eulerian-turbulent-two-fluid-model-is-not-converging","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/eulerian-eulerian-turbulent-two-fluid-model-is-not-converging\/","title":{"rendered":"Eulerian-Eulerian turbulent two-fluid model is not converging?"},"content":{"rendered":"

Hello All,<\/span><\/p>\n

<\/p>\n

I am using the Eulerian-Eulerian two-fluid model (in Ansys Fluent) to simulate the turbulent solid-liquid two-phase flow in a horizontal pipe.<\/span><\/p>\n

<\/p>\n

This is the reference paper I am trying to reproduce:<\/span><\/em><\/p>\n

<\/p>\n

Eulerian-Eulerian Simulation of Particle-Liquid Slurry Flow in Horizontal Pipe<\/span><\/em><\/p>\n

<\/p>\n

Titus Ntow Ofei and Aidil Yunus Ismail<\/span><\/em><\/p>\n

<\/p>\n

 <\/span><\/p>\n

<\/p>\n

But my simulation is not converging.<\/span><\/p>\n

<\/p>\n

For the current model:<\/span><\/p>\n

<\/p>\n

1. I reduced the inlet velocity to have a smaller Reynolds number (but it is still turbulent flow), it didn’t converge.<\/span><\/p>\n

<\/p>\n

2. I used a very small inlet velocity to have a laminar flow, it didn’t converge.<\/span><\/p>\n

<\/p>\n

3. I even established a new model on another reference paper. It did not converge, either. In this case, I think the mesh should be fine.<\/span><\/p>\n

<\/p>\n

This is the reference:<\/span><\/em><\/p>\n

<\/p>\n

Sand Transport and Deposition Behaviour in Subsea Pipelines for Flow Assurance. Yan Yang, Haoping Peng and Chuang Wen.<\/span><\/em><\/p>\n

<\/p>\n

4. In addition, I saw some Console outputs before crashing:<\/span><\/p>\n

<\/p>\n

Reversed flow on 2 faces of pressure-outlet 5.<\/span><\/em><\/p>\n

<\/p>\n

Stabilizing epsilon to enhance linear solver robustness.<\/span><\/em><\/p>\n

<\/p>\n

Stabilizing epsilon using GMRES to enhance linear solver robustness.<\/span><\/em><\/p>\n

<\/p>\n

turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 465776 cells<\/span><\/em><\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

Currently, I am thinking I might need to degrade my case further to ONLY simulate turbulent fluid flow first<\/strong>, then add the solid phase.<\/span><\/p>\n

<\/p>\n

Your valuable comments would be greatly appreciated!<\/span><\/p>\n","protected":false},"template":"","class_list":["post-42939","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["15120"],"_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":["551"],"_bbp_subscription":["249697"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["42939"],"_bbp_forum_id":["27792"],"_bbp_engagement":["167438","175530"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["121604"],"_bbp_last_active_id":["121604"],"_bbp_last_active_time":["2020-07-16 14:57:50"]},"test":"minzhang20"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/42939","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\/42939\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=42939"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}