{"id":365898,"date":"2024-05-07T16:04:11","date_gmt":"2024-05-07T16:04:11","guid":{"rendered":"\/forum\/forums\/reply\/365898\/"},"modified":"2024-05-07T16:04:11","modified_gmt":"2024-05-07T16:04:11","slug":"365898","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/365898\/","title":{"rendered":"Reply To: Loss vs. waveguide bend radius in Lumerical FEEM"},"content":{"rendered":"<p>&lt;p&gt;If the mode profile becomes like this:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/07-05-2024-1715080529-20%20um%20bend_mode1.png\" \/>&lt;\/p&gt;&lt;p&gt;I am not sure if you still can call it as a mode.&lt;\/p&gt;&lt;p&gt;Maybe such waveguide cannot be bent to small radius.&lt;\/p&gt;&lt;p&gt;Q 1) One issue is the warning which says the fields returned are of different sizes.&lt;\/p&gt;&lt;p&gt;This issue arises when the mesh changes size. Please try fixed override mesh size. Maybe FEEM needs a feature to lock the mesh.&lt;\/p&gt;&lt;p&gt;Q The loss vs. bend radius plot obtained is shown below. I expect a gradual decrease in loss with increase in radius, which is not the case here.&lt;\/p&gt;&lt;p&gt;The loss is too small. Please use larger simulation region. The loss might be mostly from PML.&lt;\/p&gt;&lt;p&gt;Memory: it might mean you have used much finer mesh. You may try to use higher order.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-365898","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=\"If the mode profile becomes like this:I am not sure if you still can call it as a mode.Maybe such waveguide cannot be bent to small radius.Q 1) One issue is the warning which says the fields returned are of different sizes.This issue arises when the mesh changes size. 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