{"id":396654,"date":"2024-12-07T05:26:01","date_gmt":"2024-12-07T05:26:01","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lumopt-unable-to-calculate-gradient-after-changing-dielectric-constant\/"},"modified":"2024-12-07T05:26:01","modified_gmt":"2024-12-07T05:26:01","slug":"lumopt-unable-to-calculate-gradient-after-changing-dielectric-constant","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lumopt-unable-to-calculate-gradient-after-changing-dielectric-constant\/","title":{"rendered":"Lumopt: Unable to calculate gradient after changing dielectric constant"},"content":{"rendered":"<p>&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;I encountered the following issues while using lumopt for inverse design.&lt;br&gt;In the official case, the given dielectric constant is 1.44\/2.80, corresponding to the background and device, respectively. I changed it to 1\/3.48 in order to simulate the actual situation, which caused the program to not run.&lt;br&gt;The specific situation is as follows,&lt;br&gt;Run according to the dielectric constant provided in the case, perform forward and adjoint simulations, and calculate the gradient to enter the first iteration.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/07-12-2024-1733548960-mceclip0.png\" \/>&lt;br&gt;After changing to<strong> silicon and air,<\/strong> the gradient cannot be calculated after forward and adjoint simulation, and it <strong>remains here<\/strong>.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/07-12-2024-1733548979-mceclip1.png\" \/>&lt;br&gt;In addition, when the <strong>mesh accuracy<\/strong> is adjusted from 2 to 3, <strong>similar situations <\/strong>may occur where gradients cannot be calculated.&lt;br&gt;If there is a solution, I would be very grateful.&lt;\/p&gt;&lt;p&gt;best regards&lt;\/p&gt;&lt;p&gt;fachien&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-396654","topic","type-topic","status-publish","hentry","topic-tag-gradient","topic-tag-inverse-design-2","topic-tag-lumopt-1","topic-tag-mesh"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,I encountered the following issues while using lumopt for inverse design.In the official case, the given dielectric constant is 1.44\/2.80, corresponding to the background and device, respectively. 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I changed it to 1\/3.48 in order to simulate the actual situation, which caused the program to not run.The specific situation is as follows,Run according to the dielectric","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lumopt-unable-to-calculate-gradient-after-changing-dielectric-constant\/","article:published_time":"2024-12-07T05:26:01+00:00","article:modified_time":"2024-12-07T05:26:01+00:00","twitter:card":"summary_large_image","twitter:title":"Lumopt: Unable to calculate gradient after changing dielectric constant | Ansys Learning Forum","twitter:description":"Hello,I encountered the following issues while using lumopt for inverse design.In the official case, the given dielectric constant is 1.44\/2.80, corresponding to the background and device, respectively. 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