{"id":459714,"date":"2026-06-14T08:06:21","date_gmt":"2026-06-14T08:06:21","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/request-for-vof-dem-2-way-coupling-tutorial-setup-guidance-in-rocky-2026-r1\/"},"modified":"2026-06-14T08:06:21","modified_gmt":"2026-06-14T08:06:21","slug":"request-for-vof-dem-2-way-coupling-tutorial-setup-guidance-in-rocky-2026-r1","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/request-for-vof-dem-2-way-coupling-tutorial-setup-guidance-in-rocky-2026-r1\/","title":{"rendered":"Request for VOF-DEM 2-Way Coupling Tutorial \/ Setup Guidance in Rocky 2026 R1"},"content":{"rendered":"

<div class=”paragraph”>Hi Rocky Team,<\/div><div class=”paragraph”>I noticed that the <strong class=””>Ansys Rocky 2026 R1 Release Highlights<\/strong> officially announced support for 2-way coupling between Rocky Unresolved and Fluent VOF multiphase model<\/strong>. This is a great enhancement for applications involving free-surface flows with particle interaction (e.g., aerated mixing tanks, slurry handling).<\/div><div class=”paragraph”>However, after reviewing the Rocky 2026 R1 Tutorial Guide<\/strong> and Verification Manual<\/strong>, I could not find any dedicated case or step-by-step workflow specifically demonstrating the VOF-DEM 2-way coupling setup<\/strong>. The existing 2-way coupling tutorials (Case 14 and Case 16) are based on the Eulerian multiphase approach, which differs significantly from the VOF framework in terms of phase definition and interface tracking.<\/div><div class=”paragraph”><strong class=””>My current understanding of the setup is:<\/strong><\/div><\/p>\n

    \n
  1. <div class=”paragraph”>In Fluent: Enable VOF multiphase model (e.g., primary phase = liquid, secondary phase = gas for free-surface tracking), plus a particle phase reserved for Rocky DEM coupling.<\/div><\/li>\n
  2. <div class=”paragraph”>In Rocky: Enable 2-way coupling with Fluent, import the Fluent case\/data file, and let Rocky handle the particle dynamics (collision, shape effects, buoyancy).<\/div><\/li>\n
  3. <div class=”paragraph”>The coupling exchanges momentum source terms at each timestep, similar to the Eulerian 2-way coupling, but under the VOF single-velocity-field framework.<\/div><\/li>\n<\/ol>\n

    <div class=”paragraph”>My questions are:<\/strong><\/div><\/p>\n

      \n
    1. <div class=”paragraph”>Is there any supplementary document, beta guide, or internal case study<\/strong> available for VOF-DEM 2-way coupling, even if not yet in the official tutorial?<\/div><\/li>\n
    2. <div class=”paragraph”>Are there specific limitations or restrictions<\/strong> for this coupling (e.g., number of VOF phases, compressible phase support, GPU solver compatibility)?<\/div><\/li>\n
    3. <div class=”paragraph”>Is there a roadmap<\/strong> for releasing an official VOF-DEM coupling tutorial in future updates?<\/div><\/li>\n<\/ol>\n

      <div class=”paragraph”>Any guidance or documentation would be highly appreciated. I am happy to provide more details about my specific application if needed.<\/div><\/p>\n","protected":false},"template":"","class_list":["post-459714","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["459714"],"_bbp_subscription":["698721","199"],"_bbp_author_ip":["216.227.189.152"],"_bbp_last_reply_id":["459759"],"_bbp_last_active_id":["459759"],"_bbp_last_active_time":["2026-06-15 10:01:39"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["698721","199"],"_btv_view_count":["69"],"_bbp_topic_status":["unanswered"]},"test":"tb22040019a51cumt-edu-cn"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/459714","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\/459714\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=459714"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}