{"id":289003,"date":"2023-06-15T20:55:43","date_gmt":"2023-06-15T20:55:43","guid":{"rendered":"\/forum\/forums\/topic\/how-to-setup-a-stable-sand-layer-by-using-eulerian-granular-multiphase\/"},"modified":"2023-06-15T20:55:43","modified_gmt":"2023-06-15T20:55:43","slug":"how-to-setup-a-stable-sand-layer-by-using-eulerian-granular-multiphase","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-setup-a-stable-sand-layer-by-using-eulerian-granular-multiphase\/","title":{"rendered":"How to setup a stable sand layer by using Eulerian granular multiphase"},"content":{"rendered":"<p class=\"MsoNormal\">Hello all,<\/p>\n<p class=\"MsoNormal\">Could you please suggest me what should I do.<\/p>\n<p class=\"MsoNormal\">I want to make a sand layer in a close domain. I understand that sand is granular, so I used an Eulerian granular multiphase model.<\/p>\n<p class=\"MsoNormal\">To make my model simple, In a close domain, all boundaries are &ldquo;wall&rdquo;, there are only air and sand (Silicon(s)). I retained many the default setting. Please see attached pictures below for my reference.<\/p>\n<p class=\"MsoNormal\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/15-06-2023-1686860911-1.JPG\" alt=\"\" width=\"248\" height=\"284\"> <img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/15-06-2023-1686860935-2.JPG\" alt=\"\" width=\"384\" height=\"291\"> &nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/15-06-2023-1686861693-4.JPG\" alt=\"\" width=\"373\" height=\"367\"> <img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/15-06-2023-1686861768-3.JPG\" alt=\"\" width=\"381\" height=\"374\"> <img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/15-06-2023-1686861027-5.JPG\" alt=\"\" width=\"262\" height=\"334\"><\/p>\n<p class=\"MsoNormal\">I think it is simple, not complicated. However, the results look weird.<\/p>\n<p class=\"MsoNormal\">By iterating with a steady way: sand spread into the air. I don&rsquo;t know by heart what force makes sand spread.<\/p>\n<p class=\"MsoNormal\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/15-06-2023-1686861463-steady.gif\" alt=\"\"><\/p>\n<p class=\"MsoNormal\">Then I just &#8220;only changed to iterate in a transient way&#8221;, the results look logical. The sand layer looks stable. However, the height of the sand layer looks to decrease over time.<\/p>\n<p class=\"MsoNormal\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/15-06-2023-1686861955-transient.gif\" alt=\"\" width=\"568\" height=\"268\"><\/p>\n<p class=\"MsoNormal\">My question is 1) Why don&rsquo;t the results between using steady and transient similar?<br \/>2) Do you have any general suggestions to fix it to create a steady sand layer?<br \/>3) Should I use steady or transient in this case? (I think I should use steady because it is close boundary and there is not any forces in a boundary, but the result I did look weird, that is why I ask you this question.)<\/p>\n<p>Thank you for any help you may provide.<\/p>\n","protected":false},"template":"","class_list":["post-289003","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello all,Could you please suggest me what should I do.I want to make a sand layer in a close domain. I understand that sand is granular, so I used an Eulerian granular multiphase model.To make my model simple, In a close domain, all boundaries are \u201cwall\u201d, there are only air and sand (Silicon(s)). 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I understand that sand is granular, so I used an Eulerian granular multiphase model.To make my model simple, In a close domain, all boundaries are \\u201cwall\\u201d, there are only air and sand (Silicon(s)). 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