{"id":394116,"date":"2024-11-15T17:53:12","date_gmt":"2024-11-15T17:53:12","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/point-exception-in-erosion-calculation\/"},"modified":"2024-11-15T17:53:12","modified_gmt":"2024-11-15T17:53:12","slug":"point-exception-in-erosion-calculation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/point-exception-in-erosion-calculation\/","title":{"rendered":"Point exception in erosion calculation"},"content":{"rendered":"<p>&lt;p&gt;Hello everyone. My previous post about erosion was deleted. I am writing a new, more updated post.&lt;br&gt;I am doing an erosion calculation.&lt;br&gt;I made a simple test model of 150K cells.&lt;br&gt;I am using the k-epsilon realizable turbulence model.&lt;br&gt;53 kg\/s of water at the input, atmospheric pressure at the output.&lt;br&gt;I am doing the calculation without a discrete phase for 100 timesteps, everything is going well, there is convergence.&lt;br&gt;I am injecting through a proppant inlet with a diameter of 14 mm, 25 kg\/s (half of the water is proppant beads).&lt;br&gt;I am tracking the particles, it shows 290 particles entering and exiting.&lt;br&gt;I am turning on erosion and the erosion grid.&lt;br&gt;I select the oka model and set the density of the material subject to erosion as for steel 8700.&lt;br&gt;I set up the calculation, select a fixed timestep (otherwise my program crashes, I don&#8217;t know why). I select a timestep of 1 sec, 100 substeps, recording every 100 steps, set up a grid for broadcasting in real time during the calculation.&lt;\/p&gt;&lt;p&gt;Here are the main screenshots of the settings that I described above:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/15-11-2024-1731692969-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/15-11-2024-1731693007-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/15-11-2024-1731693107-mceclip2.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/15-11-2024-1731693124-mceclip3.png\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/15-11-2024-1731693175-mceclip4.png\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Problems:&lt;br&gt;1. At first, everything goes well. Gradually, the graph shows erosion. But then I get a floating point exception. Why?&lt;br&gt;2. I do not see the deformation of the grid in real time, and I get an error in the console:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/15-11-2024-1731693185-mceclip5.png\" \/>&lt;\/p&gt;&lt;p&gt;Please help. Please give me some advice.&lt;br&gt;P\/S. Also, please give me some advice on which timestep is better to choose for such problems? If you select too small, for example 0.001 sec and the total calculation time is 3600 sec, it will take a very long time to calculate, considering that you still need to set substeps. If you set a very large step, a negative volume grid error occurs. I need your advice. Which timestep and substeps are best suited.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-394116","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. My previous post about erosion was deleted. I am writing a new, more updated post.I am doing an erosion calculation.I made a simple test model of 150K cells.I am using the k-epsilon realizable turbulence model.53 kg\/s of water at the input, atmospheric pressure at the output.I am doing the calculation without a discrete\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/point-exception-in-erosion-calculation\/\" \/>\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\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Point exception in erosion calculation | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello everyone. My previous post about erosion was deleted. 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