{"id":342469,"date":"2023-12-30T17:04:23","date_gmt":"2023-12-30T17:04:23","guid":{"rendered":"\/forum\/forums\/topic\/the-energy-problem-when-solving-cavitation-in-fluent\/"},"modified":"2023-12-30T17:04:23","modified_gmt":"2023-12-30T17:04:23","slug":"the-energy-problem-when-solving-cavitation-in-fluent","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/the-energy-problem-when-solving-cavitation-in-fluent\/","title":{"rendered":"The energy problem when solving cavitation in FLUENT"},"content":{"rendered":"<div>Hi all.<\/div>\n<div>I am simulating the operation of a centrifugal pump.<\/div>\n<div>I did the calculations on the water, everything is fine.<\/div>\n<div>Previously, I saw a tutorial on HOW TO from ANSYS:<\/div>\n<div>&nbsp;<\/div>\n<div><strong>https:\/\/www.youtube.com\/embed\/bgdBrOBuNgQ<\/strong><\/div>\n<div>&nbsp;<\/div>\n<div>and my settings are also the same, inlet pressure and outlet mass flow.<\/div>\n<div>&nbsp;<\/div>\n<div>Next, I need to calculate cavitation, I also paid attention to the video from ANSYS:<\/div>\n<div>&nbsp;<\/div>\n<div><strong><a class=\"youtube-link\" href=\"https:\/\/www.youtube.com\/embed\/9E3Q-cqhkVw\" target=\"_blank\" rel=\"noopener\">https:\/\/www.youtube.com\/watch?v=9E3Q-cqhkVw<\/a><\/strong><\/div>\n<div>&nbsp;<\/div>\n<div>My settings are the same again.<\/div>\n<div>&nbsp;<\/div>\n<div>My problem is that the calculation starts and the energy and continuity grow greatly, which leads to an error:<\/div>\n<div><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/12\/30-12-2023-1703955839-mceclip0.png\"><\/div>\n<div>&nbsp;<\/div>\n<div>I tried all the settings but nothing helps (changed methods, reduced relaxation coefficients, switched to stationary mode + pseudo transient, changed turbulence options k-e, k-omega, etc.).<\/div>\n<div>I used substep time steps of 0.001, it seems that this is not enough. I made a new calculation with a step of 1e-5, it was very long and left it to be decided further, the graph is already like this:<\/div>\n<div><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/12\/30-12-2023-1703955850-mceclip1.png\"><\/div>\n<div>&nbsp;<\/div>\n<div>Can this help? Should you take an even smaller step? The calculation will take even longer, I&#8217;m using 48 cores.<\/div>\n<div>Thank you.<\/div>\n","protected":false},"template":"","class_list":["post-342469","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["257647","199"],"_bbp_author_ip":["23.206.193.146"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["513"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["342469"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","257647"],"_bbp_voice_count":["2"],"_bbp_reply_count":["19"],"_bbp_last_reply_id":["344048"],"_bbp_last_active_id":["344048"],"_bbp_last_active_time":["2024-01-10 17:36:16"]},"test":"javat33489gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/342469","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\/342469\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=342469"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}