{"id":392978,"date":"2024-11-06T13:32:01","date_gmt":"2024-11-06T13:32:01","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-does-source-size-keep-expanding-automatically\/"},"modified":"2024-11-06T13:32:01","modified_gmt":"2024-11-06T13:32:01","slug":"why-does-source-size-keep-expanding-automatically","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-does-source-size-keep-expanding-automatically\/","title":{"rendered":"Why does source size keep expanding automatically?"},"content":{"rendered":"<p>&lt;p&gt;I have a 3D periodic structure, illuminated by a plane wave source (BFAST) at an angle.&nbsp;&lt;\/p&gt;&lt;p&gt;I have set the source footprint geometry to the same dimension as the periodic region (i.e. same as cross sectional dimension of structure and mesh). Whenever I run the solver, it automatically increases the size of the source geometry, doubling each dimension. See the below screenshot, in which the white outline of the source has been expanded and no longer coincides with the orange line (mesh boundary).&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/06-11-2024-1730899834-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;Side view for context:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/06-11-2024-1730899880-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;Thanks!&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392978","topic","type-topic","status-publish","hentry","topic-tag-photonics"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["131.111.5.201"],"_btv_view_count":["281"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["473055","447143"],"_bbp_notification_enabled":["473055"],"_bbp_topic_id":["392978"],"_bbp_forum_id":["27833"],"_bbp_engagement":["447143","473055"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["393355"],"_bbp_last_active_id":["393355"],"_bbp_last_active_time":["2024-11-08 16:18:08"]},"test":"737d335032f784804bb5cb7a049cd44cd63e8ad6"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/392978","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/392978\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=392978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}