{"id":291050,"date":"2023-06-30T08:28:08","date_gmt":"2023-06-30T08:28:08","guid":{"rendered":"\/forum\/forums\/topic\/convergence-in-each-flow-timestep-but-divergence-when-flow-timestep-changes\/"},"modified":"2023-07-03T11:12:26","modified_gmt":"2023-07-03T11:12:26","slug":"convergence-in-each-flow-timestep-but-divergence-when-flow-timestep-changes","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/convergence-in-each-flow-timestep-but-divergence-when-flow-timestep-changes\/","title":{"rendered":"Convergence in Each Flow Timestep, But Divergence When Flow Timestep Changes"},"content":{"rendered":"<p><span style=\"font-size: 10pt\">I am trying to model impeller mixing of high volume fraction of particles in water (transient, Eulerian, DDPM, kwsst, Coupled, injection). The issue is that simulation solves and <strong>converges <\/strong>(as per both residuals and monitored variables) for the first <strong>flow<\/strong> timestep, but <strong>when the flow timestep is bumping to the second one, continuity and k, e residuals fly up to 10 orders of magnitude (!)<\/strong>, and then there is this <em>Experiencing convergence difficulties&nbsp;<\/em>warning before I get<em>&nbsp;floating point exception<\/em>&nbsp;and simulation is terminated.<\/span><\/p>\n<p><span style=\"font-size: 10pt\"><img decoding=\"async\" title=\"Residuals go up when Flow timestep bumps, despite monitored variables are stable.\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/30-06-2023-1688115363-screenshot_39.png\" alt=\"\"><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 10pt\"><img decoding=\"async\" title=\"Console view right before divergence. (Does the divergence have to do anything with turbulence?)\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/30-06-2023-1688115421-screenshot_40.png\" alt=\"\"><\/span><\/p>\n<p><span style=\"font-size: 10pt\">My background effort to fix the issue has been the following, however, I have tried most of them one at a time, instead of in tandem, to see individual effect each could have had,that&#8217;s why they are open to discussion if you think so:<\/span><\/p>\n<ul class=\"topic-with-bgcolor\">\n<li class=\"hassub\"><span style=\"font-size: 10pt\">Solving the flow to a stable state before injecting<\/span><\/li>\n<li class=\"hassub\" style=\"direction: rtl\"><span style=\"font-size: 10pt\">refining the mesh ( Watertight\/ <strong>Polyhedral <\/strong>or <strong>Polyhedral Hex Core<\/strong> &#8211;&nbsp;<strong>Orth<\/strong>: min. 0.3 &#8211; avg 0.95&nbsp; |&nbsp;&nbsp;<strong>Skew<\/strong>: max 0.7 avg 0.04&nbsp; |&nbsp;&nbsp;<strong>AspR<\/strong>: Max 19.9 &#8211; avg 1.75) (I read somewhere tetrahedral mesh should be used to fix this issue. How reliable is this advice?),<\/span><\/li>\n<li class=\"hassub\"><span style=\"font-size: 10pt\">solving for flow timesteps as small as 0.002 [s],<\/span><\/li>\n<li class=\"hassub\"><span style=\"font-size: 10pt\">compromising on injections as small as parcel count of 2 (while keeping DDPM active),<\/span><\/li>\n<li class=\"hassub\"><span style=\"font-size: 10pt\">manipulating URF&#8217;s of momentum, pressure, k and e for as low as 0.2 (pressure) and 0.5 for the rest, as the manulal says<\/span><\/li>\n<li class=\"hassub\"><span style=\"font-size: 10pt\">increasing number of DPM updates per flow timestep and reducing DPM source URF to make sure DPM sources are fully consumed in each timestep.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 10pt\">Since tank top is open in reality, I define&nbsp;<strong>zero-shear wall&nbsp;<\/strong>and&nbsp;<strong>escape&nbsp;<\/strong>as boundary condition for top open surface and DPM, which I believe should not be a deal. I am neither brand new to Fluent nor an expert, especially given the fact that I have learned on my own so far. I am thus far coming to the question if such model is ever soluable in Fluent at all?&nbsp;<\/span><\/p>\n<p><span style=\"font-size: 10pt\">But there is nothing else I can either find online, in the Fluent User\/Theory Guide or think of on my own.<\/span><\/p>\n<p><span style=\"font-size: 10pt\">Can anyone help please?<\/span><\/p>\n","protected":false},"template":"","class_list":["post-291050","topic","type-topic","status-closed","hentry","topic-tag-ddpm","topic-tag-dramine-1","topic-tag-floating-point-exception","topic-tag-injection","topic-tag-mixing-tank","topic-tag-nanoparticles","topic-tag-particle","topic-tag-rob-2"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am trying to model impeller mixing of high volume fraction of particles in water (transient, Eulerian, DDPM, kwsst, Coupled, injection). 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