{"id":30334,"date":"2018-09-07T17:37:24","date_gmt":"2018-09-07T17:37:24","guid":{"rendered":"\/forum\/forums\/topic\/tank-fill-simulation\/"},"modified":"2018-09-07T17:37:24","modified_gmt":"2018-09-07T17:37:24","slug":"tank-fill-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/tank-fill-simulation\/","title":{"rendered":"Tank Fill Simulation"},"content":{"rendered":"

Setup: <\/strong>Following tutorial at https:\/\/www.youtube.com\/watch?v=xQBvYceTg8E<\/p>\n

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Geometry:<\/strong> Symmetric 10cm radius cylinder w\/ hieght = 20cm; inlet = 4cm; outlet = 2cm;<\/p>\n

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Mesh Quality: <\/strong><\/p>\n

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Minimum Orthogonal Quality: 6.2682e-01; Maximum Aspect Ration = 1.07262e+01<\/p>\n

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Solution Setup:<\/strong><\/p>\n

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– transient \/\/ gravity (z = -9.\"8)\" \/\/ Vol. of Fluid — Water and Air \/\/ Energy ON<\/p>\n

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– Inlet: Vol Frac. Water = 1 \/ Velocity Mag. = 0.01 m\/s; Outlet Backflo Vol. Frac. Water = 0<\/p>\n

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– Fluid Vol. = mixture \/\/ Solution Method — See Picture \/\/ Solution Controls = Default<\/p>\n

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– Initialization: Standard from Inlet \/\/ Adapted Region = See Picture Included<\/p>\n

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– Patched Fluid Zone volume fraction of water = 0 \/\/ autosave every 5 time steps<\/p>\n

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– time step = 0.01s; number of time steps = 5000; max iterations\/time step = 10;<\/p>\n

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Questions:<\/p>\n

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(1): After running the simulation, I viewed the animation of the volume fraction of water and found that the inlet stopped supplying water almost immediately (<<1sec). Is there a common reason, or reason based on the setup for why this would have happened?<\/span><\/p>\n

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(2): Based on the residual plot below, I was having difficulty judging the convergence of the solution. For a transient solution, is it expected to have oscillating residuals? Although most of the residual values “stabilized” around 10^-3 i.e. roughly stable I wasn’t convinced. The simulation had maximum iterations\/time step = 10; however, at the end of the simulation convergence was occurring with just two iterations, would this be justification for convergence? <SEE IMAGE IN DISCUSSION><\/span><\/p>\n

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(3): In terms of simulation speed, this took > 8hrs the other day which will not work going forward. I understand you can use the parallel computing option to speed up the process, but I’m wondering what the recommended processes assigned are to optimize speed, but also ensure limited wear and tear on my everyday computer.<\/span><\/p>\n","protected":false},"template":"","class_list":["post-30334","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["2503"],"_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","0","0","0","0"],"_btv_view_count":["1952"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["30334"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","199","158552"],"_bbp_voice_count":["3"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["64046"],"_bbp_last_active_id":["64046"],"_bbp_last_active_time":["2018-09-12 10:17:47"]},"test":"jesseahlquist"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/30334","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\/30334\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=30334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}