{"id":372383,"date":"2024-07-17T13:02:11","date_gmt":"2024-07-17T13:02:11","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372383\/"},"modified":"2024-07-17T13:02:11","modified_gmt":"2024-07-17T13:02:11","slug":"372383","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372383\/","title":{"rendered":"Reply To: non-physical negative uds concentrations with small diffusion coefficient"},"content":{"rendered":"<p>&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/17-07-2024-1721220816-Screenshot 2024-07-17 075311.png\" alt=\"\" width=\"512\" height=\"594\" \/>&lt;\/p&gt;&lt;p&gt;I have added a screenshot of the mesh for reference. The surface mesh is reasonably coarse, 1 full cell and 2 half cells along that corner piece. Internally there are very fine prism layers with first cell thickness of ~1e-6m.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;I have no doubt the mesh is a large part of the issue with the non-physical concentrations, but as I said before I am kind of stuck with the current mesh and would like to try and make it workable. So far modifying the diffusion coefficient has kept the negative concentration from running away and causing major problems.&nbsp; &nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-372383","reply","type-reply","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=\"I have added a screenshot of the mesh for reference. The surface mesh is reasonably coarse, 1 full cell and 2 half cells along that corner piece. Internally there are very fine prism layers with first cell thickness of ~1e-6m. I have no doubt the mesh is a large part of the issue with the non-physical\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372383\/\" \/>\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=\"Reply To: non-physical negative uds concentrations with small diffusion coefficient | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I have added a screenshot of the mesh for reference. The surface mesh is reasonably coarse, 1 full cell and 2 half cells along that corner piece. Internally there are very fine prism layers with first cell thickness of ~1e-6m. I have no doubt the mesh is a large part of the issue with the non-physical\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372383\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/17-07-2024-1721220816-Screenshot%202024-07-17%20075311.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/17-07-2024-1721220816-Screenshot%202024-07-17%20075311.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-07-17T13:02:11+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-07-17T13:02:11+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: non-physical negative uds concentrations with small diffusion coefficient | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I have added a screenshot of the mesh for reference. The surface mesh is reasonably coarse, 1 full cell and 2 half cells along that corner piece. Internally there are very fine prism layers with first cell thickness of ~1e-6m. I have no doubt the mesh is a large part of the issue with the non-physical\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/17-07-2024-1721220816-Screenshot 2024-07-17 075311.png\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/372383\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/372383\\\/#listItem\",\"name\":\"Reply To: non-physical negative uds concentrations with small diffusion coefficient\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/372383\\\/#listItem\",\"position\":2,\"name\":\"Reply To: non-physical negative uds concentrations with small diffusion coefficient\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/372383\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/372383\\\/\",\"name\":\"Reply To: non-physical negative uds concentrations with small diffusion coefficient | Ansys Learning Forum\",\"description\":\"I have added a screenshot of the mesh for reference. The surface mesh is reasonably coarse, 1 full cell and 2 half cells along that corner piece. Internally there are very fine prism layers with first cell thickness of ~1e-6m. 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The surface mesh is reasonably coarse, 1 full cell and 2 half cells along that corner piece. Internally there are very fine prism layers with first cell thickness of ~1e-6m. 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The surface mesh is reasonably coarse, 1 full cell and 2 half cells along that corner piece. Internally there are very fine prism layers with first cell thickness of ~1e-6m. I have no doubt the mesh is a large part of the issue with the non-physical","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372383\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/17-07-2024-1721220816-Screenshot%202024-07-17%20075311.png","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/17-07-2024-1721220816-Screenshot%202024-07-17%20075311.png","article:published_time":"2024-07-17T13:02:11+00:00","article:modified_time":"2024-07-17T13:02:11+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: non-physical negative uds concentrations with small diffusion coefficient | Ansys Learning Forum","twitter:description":"I have added a screenshot of the mesh for reference. 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