{"id":359078,"date":"2024-03-26T14:39:39","date_gmt":"2024-03-26T14:39:39","guid":{"rendered":"\/forum\/forums\/reply\/359078\/"},"modified":"2024-03-28T04:15:59","modified_gmt":"2024-03-28T04:15:59","slug":"359078","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/359078\/","title":{"rendered":"Reply To: How can I give different transmissivity with more than 3 wavelength region?"},"content":{"rendered":"<p>&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Hello Mr. Essence,&nbsp;&lt;\/p&gt;&lt;p&gt;Thank you very much for the response. I am using semi &ndash; transparent material and its emissivity is 0.25 for Long wave radiation, Refractive index is 2.2. I followed the instructions given by you. In the radiation tab, There is an option called beam direction where the default is X = 0, Y = 0 and Z = 1. I have an acceleration due to gravity set in Y direction = -9.81 m\/s2. Then What is beam direction. Should it be X = 0, Y = 1 and Z =0 or X = 0, Y = -1 and z = 0 given the Y = acceleration due to gravity = 9.81 and this application for natural convection ?&lt;\/p&gt;&lt;p&gt;Please kindly help me.&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-359078","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=\"Hello Mr. Essence, Thank you very much for the response. I am using semi \u2013 transparent material and its emissivity is 0.25 for Long wave radiation, Refractive index is 2.2. I followed the instructions given by you. In the radiation tab, There is an option called beam direction where the default is X = 0, Y\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/359078\/\" \/>\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: How can I give different transmissivity with more than 3 wavelength region? | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello Mr. Essence, Thank you very much for the response. I am using semi \u2013 transparent material and its emissivity is 0.25 for Long wave radiation, Refractive index is 2.2. I followed the instructions given by you. 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