{"id":238174,"date":"2022-10-20T01:27:58","date_gmt":"2022-10-20T01:27:58","guid":{"rendered":"\/forum\/forums\/topic\/issue-with-coupling-gap-calculation\/"},"modified":"2023-04-18T06:34:10","modified_gmt":"2023-04-18T06:34:10","slug":"issue-with-coupling-gap-calculation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issue-with-coupling-gap-calculation\/","title":{"rendered":"Issue with coupling gap calculation"},"content":{"rendered":"<p>I am running the CROW lumerical example and after figuring out Kappa1, and 2 from interconnect simulations, I tried to run the FDTD file to calculate the gaps. But the high accuracy and coarse mesh sweep for gaps yield different curves. Furthermore, running the &#8220;calculate gaps&#8221; script file yields negative numbers for the gap. What could be the reason for the strange numbers\/values and the difference between the sweep outputs?<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/10\/20-10-2022-1666228694-strange coupling gaps.PNG\" alt=\"\"><\/p>\n<p>&nbsp;<\/p>\n<p>For example, the S41 from both these sweeps are different.<\/p>\n<p><img decoding=\"async\" title=\"S41 difference\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/10\/20-10-2022-1666229266-S4 Different for sweeps.PNG\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-238174","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am running the CROW lumerical example and after figuring out Kappa1, and 2 from interconnect simulations, I tried to run the FDTD file to calculate the gaps. But the high accuracy and coarse mesh sweep for gaps yield different curves. Furthermore, running the &quot;calculate gaps&quot; script file yields negative numbers for the gap. What\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issue-with-coupling-gap-calculation\/\" \/>\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=\"Issue with coupling gap calculation | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am running the CROW lumerical example and after figuring out Kappa1, and 2 from interconnect simulations, I tried to run the FDTD file to calculate the gaps. But the high accuracy and coarse mesh sweep for gaps yield different curves. Furthermore, running the &quot;calculate gaps&quot; script file yields negative numbers for the gap. 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But the high accuracy and coarse mesh sweep for gaps yield different curves. Furthermore, running the &quot;calculate gaps&quot; script file yields negative numbers for the gap. 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But the high accuracy and coarse mesh sweep for gaps yield different curves. Furthermore, running the \\\"calculate gaps\\\" script file yields negative numbers for the gap. 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But the high accuracy and coarse mesh sweep for gaps yield different curves. Furthermore, running the \"calculate gaps\" script file yields negative numbers for the gap. 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