{"id":392101,"date":"2024-10-30T18:07:26","date_gmt":"2024-10-30T18:07:26","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/different-farfield-results-2d-vs-3d-simulation\/"},"modified":"2024-10-30T18:07:26","modified_gmt":"2024-10-30T18:07:26","slug":"different-farfield-results-2d-vs-3d-simulation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/different-farfield-results-2d-vs-3d-simulation\/","title":{"rendered":"Different Farfield Results 2D vs 3D Simulation"},"content":{"rendered":"<p>&lt;p&gt;When performing a 2D simulation, I achieve different results from when I perform a 3D simulation of the same model. For one, the x-values of the peaks are matching, but the intensities are not. The x-axes of the plots are different but that should just be a conversion. Another clarification, I&#8217;m taking a slice at uz = 0 for the 3D simulation to get a 2D plot of the intensity in the farfield. The model is a diffraction grating with a source injecting in the forward Y-direction. The monitor for the given results is placed just above the device, where the light should be exiting. For the 2D simualtion, there should be no z-direction. For the 3D simulation, the grating ranges from -3 to 3 in the z-direction. Like I said before, I would assume taking a slice at 0 would give the same results.&lt;\/p&gt;&lt;p&gt;I&#8217;m not sure if there are settings for the visualizer that I have incorrect or if there if I should be doing somehting diffrent with the dimensions of the model\/simulation.&lt;\/p&gt;&lt;p&gt;Shown below is the 3D simulation plot.&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/30-10-2024-1730310643-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;Shown below is the 2D simulation plot. Only settign that was changed was the FDTD being set to a 2D simulation.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/30-10-2024-1730310695-mceclip1.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392101","topic","type-topic","status-publish","hentry","topic-tag-2d","topic-tag-2d-analysis","topic-tag-3d","topic-tag-farfield-2","topic-tag-LumericalFDTD-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"When performing a 2D simulation, I achieve different results from when I perform a 3D simulation of the same model. For one, the x-values of the peaks are matching, but the intensities are not. The x-axes of the plots are different but that should just be a conversion. Another clarification, I&#039;m taking a slice at\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/different-farfield-results-2d-vs-3d-simulation\/\" \/>\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=\"Different Farfield Results 2D vs 3D Simulation | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"When performing a 2D simulation, I achieve different results from when I perform a 3D simulation of the same model. For one, the x-values of the peaks are matching, but the intensities are not. The x-axes of the plots are different but that should just be a conversion. Another clarification, I&#039;m taking a slice at\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/different-farfield-results-2d-vs-3d-simulation\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-30T18:07:26+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-10-30T18:07:26+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Different Farfield Results 2D vs 3D Simulation | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"When performing a 2D simulation, I achieve different results from when I perform a 3D simulation of the same model. For one, the x-values of the peaks are matching, but the intensities are not. The x-axes of the plots are different but that should just be a conversion. 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