{"id":374692,"date":"2024-08-01T14:28:43","date_gmt":"2024-08-01T14:28:43","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-improve-the-results-of-an-optimization-in-optislang\/"},"modified":"2024-08-01T14:28:43","modified_gmt":"2024-08-01T14:28:43","slug":"how-to-improve-the-results-of-an-optimization-in-optislang","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-improve-the-results-of-an-optimization-in-optislang\/","title":{"rendered":"How to improve the results of an optimization in optislang"},"content":{"rendered":"<p>Hello everyone,<\/p>\n<p>I am working on a CFD simulation of a design that I would like to optimise usig Fluent + optislang.<\/p>\n<p>The process I have been following is: 1) sensitivity analysis; 2) MOP; 3) optimization wizard on the MOP.<\/p>\n<p>The first two steps are okay but when I run the optimization my results are wrong, I obtain a pareto front like this:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/01-08-2024-1722521802-mceclip0.png\" width=\"448\" height=\"310\"><\/p>\n<p>but I know it&#8217;s wrong because the quantity that I have on the y axis cannot be negative.<\/p>\n<p>I have also solved some points and their outputs are very different from the predicted ones:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/01-08-2024-1722521930-mceclip1.png\" width=\"309\" height=\"255\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/01-08-2024-1722521956-mceclip2.png\" width=\"311\" height=\"253\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/01-08-2024-1722522204-mceclip4.png\" width=\"467\" height=\"317\"><\/p>\n<p>I think the only reason for this to happen is the bad quality of the MOP, but if I check my MOP most of them have good quality:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"font-size: 18.6667px\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/01-08-2024-1722522187-mceclip3.png\" width=\"568\" height=\"364\"><\/p>\n<p>I tried to improve further the avg_pli model but the best I can get is 73%, which I don&#8217;t think is that bad to give me such wrong values. Also, the avg_ss has good quality but the results are still wrong.<\/p>\n<p>At this point I am not sure what to do.<\/p>\n<p>Does anyone have any advice\/ can explain why this is happening?<\/p>\n<p>Thank you in advance.<\/p>\n","protected":false},"template":"","class_list":["post-374692","topic","type-topic","status-publish","hentry","topic-tag-design-optimization","topic-tag-doe-1","topic-tag-optimisation-2","topic-tag-optislang"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello everyone,I am working on a CFD simulation of a design that I would like to optimise usig Fluent + optislang.The process I have been following is: 1) sensitivity analysis; 2) MOP; 3) optimization wizard on the MOP.The first two steps are okay but when I run the optimization my results are wrong, I obtain\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" 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