{"id":280890,"date":"2023-04-24T08:18:34","date_gmt":"2023-04-24T08:18:34","guid":{"rendered":"\/forum\/?post_type=topic&#038;p=280890"},"modified":"2023-04-24T08:32:11","modified_gmt":"2023-04-24T08:32:11","slug":"spheres-falling-in-water-using-macroscopic-particle-model-mpm-in-fluent","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/spheres-falling-in-water-using-macroscopic-particle-model-mpm-in-fluent\/","title":{"rendered":"Spheres Falling in Water using Macroscopic Particle Model (MPM) in Fluent"},"content":{"rendered":"<p>Hi,<\/p>\n<p>I am attempting to simulate a sphere settling under gravity in a viscous fluid (water for now) using the Macroscopic Particle Method (MPM) in Fluent 2023 R1.<\/p>\n<p>I managed to set up a sphere falling in air by watching a good video&nbsp;posted on a YouTube channel mentioned in the CFD Online thread <a href=\"https:\/\/www.cfd-online.com\/Forums\/fluent\/33104-macroscopic-particle-model-mpm.html\" target=\"_blank\" rel=\"noopener\">https:\/\/www.cfd-online.com\/Forums\/fluent\/33104-macroscopic-particle-model-mpm.html<\/a>:<\/p>\n<p><a href=\"https:\/\/youtu.be\/bGU62t9DDy0\" target=\"_blank\" rel=\"noopener\">https:\/\/youtu.be\/bGU62t9DDy0<\/a><\/p>\n<p>I tried to set up spheres falling in water with steps from another video posted on the same YouTube channel:<\/p>\n<p><a href=\"https:\/\/youtu.be\/920ajl_nV68\" target=\"_blank\" rel=\"noopener\">https:\/\/youtu.be\/920ajl_nV68<\/a><\/p>\n<p>However, the spheres either don&#8217;t move or the behaviour is unphysical. Also, the continuity residuals are very large. The geometry I use is very similar; it is slightly simplified to be just a rectangular box without the reduction in size in the middle of the domain, but uses the same overall dimensions from the video. The mesh I am using has very similarly sized tetrahedral elements as well. I am following the steps as closely as possible, but I still cannot replicate the behaviour from the video.<\/p>\n<p>I should note that I had to replace the animation setup from the videos with the more current &#8220;scene&#8221; setup.<\/p>\n<p>Would anybody have any advice on this issue?<\/p>\n<p>Thanks!<\/p>\n","protected":false},"template":"","class_list":["post-280890","topic","type-topic","status-closed","hentry","topic-tag-multiphase_models-1","topic-tag-fluent"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["96.7.74.191"],"_bbp_subscription":["29414","199","248439"],"_btv_view_count":["789"],"_edit_lock":["1682336598:215782"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["280890"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","29414","248439"],"_bbp_voice_count":["3"],"_bbp_reply_count":["11"],"_bbp_last_reply_id":["289423"],"_bbp_last_active_id":["289423"],"_bbp_last_active_time":["2023-06-19 16:37:59"]},"test":"gerald-gallaghertudublin-ie"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/280890","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\/280890\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=280890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}