{"id":250694,"date":"2023-02-21T07:35:45","date_gmt":"2023-02-21T07:35:45","guid":{"rendered":"\/forum\/forums\/topic\/reflection-is-more-than-1-with-bfast-source-for-off-normal-incident\/"},"modified":"2023-02-21T07:35:45","modified_gmt":"2023-02-21T07:35:45","slug":"reflection-is-more-than-1-with-bfast-source-for-off-normal-incident","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/reflection-is-more-than-1-with-bfast-source-for-off-normal-incident\/","title":{"rendered":"Reflection is more than 1 with BFAST source for off-normal incident"},"content":{"rendered":"<p>I am doing a simulation with periodic structures, like pillars (material 1) on top of a base (material 2), to get an idea about reflection and transmission with a plane wave source placed on top of the structures, at a certain distance. I need to check it with off-normal incident of the plane wave, so I included BFAST source. I am facing a problem with BFAST; as for the lower incident angle (up to 25 degrees), I am getting reflections of more than 1, basically the problem with the normalization. I have included extra mesh around the pillars, just to go towards the finer mesh, and also selected a mesh order of 4, but still, the problem remains. Please suggest how to resolve the problem. Another problem is for higher angles each simulation is taking more than 1h, even though I reduced the simulation time to 500fs instead of 1000fs.&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-250694","topic","type-topic","status-closed","hentry","topic-tag-fdtd","topic-tag-lumerical","topic-tag-periodic"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am doing a simulation with periodic structures, like pillars (material 1) on top of a base (material 2), to get an idea about reflection and transmission with a plane wave source placed on top of the structures, at a certain distance. I need to check it with off-normal incident of the plane wave, so\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/reflection-is-more-than-1-with-bfast-source-for-off-normal-incident\/\" \/>\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=\"Reflection is more than 1 with BFAST source for off-normal incident | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am doing a simulation with periodic structures, like pillars (material 1) on top of a base (material 2), to get an idea about reflection and transmission with a plane wave source placed on top of the structures, at a certain distance. I need to check it with off-normal incident of the plane wave, so\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/reflection-is-more-than-1-with-bfast-source-for-off-normal-incident\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-02-21T07:35:45+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-02-21T07:35:45+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reflection is more than 1 with BFAST source for off-normal incident | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I am doing a simulation with periodic structures, like pillars (material 1) on top of a base (material 2), to get an idea about reflection and transmission with a plane wave source placed on top of the structures, at a certain distance. I need to check it with off-normal incident of the plane wave, so\" \/>\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\\\/topic\\\/reflection-is-more-than-1-with-bfast-source-for-off-normal-incident\\\/#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\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/periodic\\\/#listItem\",\"name\":\"periodic\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/periodic\\\/#listItem\",\"position\":3,\"name\":\"periodic\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/periodic\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/reflection-is-more-than-1-with-bfast-source-for-off-normal-incident\\\/#listItem\",\"name\":\"Reflection is more than 1 with BFAST source for off-normal incident\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/reflection-is-more-than-1-with-bfast-source-for-off-normal-incident\\\/#listItem\",\"position\":4,\"name\":\"Reflection is more than 1 with BFAST source for off-normal incident\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/periodic\\\/#listItem\",\"name\":\"periodic\"}}]},{\"@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\\\/topic\\\/reflection-is-more-than-1-with-bfast-source-for-off-normal-incident\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/reflection-is-more-than-1-with-bfast-source-for-off-normal-incident\\\/\",\"name\":\"Reflection is more than 1 with BFAST source for off-normal incident | Ansys Learning Forum\",\"description\":\"I am doing a simulation with periodic structures, like pillars (material 1) on top of a base (material 2), to get an idea about reflection and transmission with a plane wave source placed on top of the structures, at a certain distance. 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