{"id":213076,"date":"2022-04-27T16:51:35","date_gmt":"2022-04-27T16:51:35","guid":{"rendered":"\/forum\/forums\/reply\/213076\/"},"modified":"2022-04-27T16:51:35","modified_gmt":"2022-04-27T16:51:35","slug":"213076","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/213076\/","title":{"rendered":"Reply To: FDTD simulation: phase value (phase monitor)"},"content":{"rendered":"<p>You are right that the phase at a specific wavelength should be fixed in physics.<br \/>\nHowever,  the resulting phase is highly dependent on the mesh size due to numerical dispersion. When the source start wavelength changes, the mesh size will automatically change by default.  The mesh change might also be due to material fitting change: when the spectrum changes the fitting may lead to different material data.<br \/>\nTo alleviate this problem, please fix the mesh generation and material fitting wavelength range. You can use this:<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/616\/VRR0Y2SFNPUB.png\" width=\"1807\" height=\"1424\" \/><\/p>\n<p>or more specifically, set them in mesh generation:<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/040\/QHXIUDLT0R75.png\" width=\"1620\" height=\"1405\" \/><br \/>\nand fitting:<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/621\/6GJPZHEU44K6.png\" width=\"1838\" height=\"1637\" \/>They should lead to the same result. Please try.<\/p>\n","protected":false},"template":"","class_list":["post-213076","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=\"You are right that the phase at a specific wavelength should be fixed in physics. However, the resulting phase is highly dependent on the mesh size due to numerical dispersion. When the source start wavelength changes, the mesh size will automatically change by default. The mesh change might also be due to material fitting change:\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/213076\/\" \/>\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: FDTD simulation: phase value (phase monitor) | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"You are right that the phase at a specific wavelength should be fixed in physics. However, the resulting phase is highly dependent on the mesh size due to numerical dispersion. When the source start wavelength changes, the mesh size will automatically change by default. The mesh change might also be due to material fitting change:\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/213076\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/forum-uploads\/616\/VRR0Y2SFNPUB.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/forum-uploads\/616\/VRR0Y2SFNPUB.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2022-04-27T16:51:35+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2022-04-27T16:51:35+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: FDTD simulation: phase value (phase monitor) | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"You are right that the phase at a specific wavelength should be fixed in physics. However, the resulting phase is highly dependent on the mesh size due to numerical dispersion. When the source start wavelength changes, the mesh size will automatically change by default. 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However, the resulting phase is highly dependent on the mesh size due to numerical dispersion. When the source start wavelength changes, the mesh size will automatically change by default. 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However, the resulting phase is highly dependent on the mesh size due to numerical dispersion. When the source start wavelength changes, the mesh size will automatically change by default. 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