{"id":391111,"date":"2024-10-23T19:13:27","date_gmt":"2024-10-23T19:13:27","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ball-movement-under-water-flow\/"},"modified":"2024-10-23T19:13:27","modified_gmt":"2024-10-23T19:13:27","slug":"ball-movement-under-water-flow","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ball-movement-under-water-flow\/","title":{"rendered":"Ball movement under water flow"},"content":{"rendered":"<p>&lt;p&gt;Hello everyone, I am simulating the movement of a ball under water flow.&lt;br&gt;The liquid with the speed of 7 l\/s moves the ball towards the saddle (from right to left), gravity is also indicated from right to left (in fact, the pipe is vertical).&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/23-10-2024-1729710736-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;I am using 6DOF and remeshing.&lt;br&gt;But during the solution I get the error negative volume mesh:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/23-10-2024-1729710755-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;I reduced the substeps and remeshing interval but it did not help:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/23-10-2024-1729710777-mceclip2.png\" \/>&lt;\/p&gt;&lt;p&gt;I also strongly crushed the grid:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/23-10-2024-1729710790-mceclip3.png\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/23-10-2024-1729710790-mceclip4.png\" \/>&lt;\/p&gt;&lt;p&gt;but it did not help either.&lt;br&gt;I am using k-epsilon.&lt;\/p&gt;&lt;p&gt;Tell me what else can be done?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-391111","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello everyone, I am simulating the movement of a ball under water flow.The liquid with the speed of 7 l\/s moves the ball towards the saddle (from right to left), gravity is also indicated from right to left (in fact, the pipe is vertical).I am using 6DOF and remeshing.But during the solution I get the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ball-movement-under-water-flow\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" 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