{"id":398521,"date":"2024-12-26T14:53:15","date_gmt":"2024-12-26T14:53:15","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/398521\/"},"modified":"2024-12-26T14:53:15","modified_gmt":"2024-12-26T14:53:15","slug":"398521","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/398521\/","title":{"rendered":"Reply To: Selective mass scaling"},"content":{"rendered":"<p>&lt;p&gt;Hello Nikhil,&lt;br&gt;Your observations are correct, despite selective mass scaling (SMS) being more computationally intensive due to its requirement for solving a sparse system of equations at each time step, it often results in less overall simulation time due to its ability to maintain accuracy with fewer iterations. SMS uses a preconditioned conjugate gradient method (PCG) for solving the equations. The iterative nature of SMS means that while it may require more CPU resources per time step, it can converge faster overall for certain problems, especially in complex simulations where accuracy is critical&lt;\/p&gt;&lt;p&gt;This is likely why you observed a 50% reduction in simulation time when using SMS compared to CMS. Hope this helps.&lt;\/p&gt;&lt;p style=&#8221;font-family: Helvetica, Arial, sans-serif; font-style: normal; font-weight: 400; color: #000000; margin: 0px !important; padding: 0px !important;&#8221;&gt;Regards,&lt;\/p&gt;&lt;p style=&#8221;font-family: Helvetica, Arial, sans-serif; font-style: normal; font-weight: 400; color: #000000; margin: 0px !important; padding: 0px !important;&#8221;&gt;Nanda.&lt;\/p&gt;&lt;p style=&#8221;font-family: Helvetica, Arial, sans-serif; font-style: normal; font-weight: 400; color: #000000; margin: 0px !important; padding: 0px !important;&#8221;&gt;If you are not able to open Ansys help links, refer to this forum discussion: <a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-access-the-ansys-online-help\/\">How to access the ANSYS Online Help<\/a>&lt;\/p&gt;&lt;p style=&#8221;font-family: Helvetica, Arial, sans-serif; font-style: normal; font-weight: 400; color: #000000; margin: 0px !important; padding: 0px !important;&#8221;&gt;Also, we launched a public help documentation website: <a href=\"https:\/\/ansyshelp.ansys.com\/public\/account\/secured?returnurl=\/Views\/Secured\/main_page.html\">Ansys Help<\/a>&lt;\/p&gt;&lt;p style=&#8221;font-family: Helvetica, Arial, sans-serif; font-style: normal; font-weight: 400; color: #000000; margin: 0px !important; padding: 0px !important;&#8221;&gt;For more exciting courses and certifications, hit this link: <a href=\"https:\/\/innovationspace.ansys.com\/courses\/\">Ansys Innovation Courses | ANSYS Innovation Space<\/a>&lt;\/p&gt;&lt;p style=&#8221;font-family: Helvetica, Arial, sans-serif; font-style: normal; font-weight: 400; color: #000000; margin: 0px !important; padding: 0px !important;&#8221;&gt;<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/guidelines-for-posting-on-ansys-learning-forum\/#latest\">Guidelines for Posting on Ansys Learning Forum<\/a>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-398521","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 Nikhil,Your observations are correct, despite selective mass scaling (SMS) being more computationally intensive due to its requirement for solving a sparse system of equations at each time step, it often results in less overall simulation time due to its ability to maintain accuracy with fewer iterations. SMS uses a preconditioned conjugate gradient method (PCG)\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/398521\/\" \/>\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: Selective mass scaling | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello Nikhil,Your observations are correct, despite selective mass scaling (SMS) being more computationally intensive due to its requirement for solving a sparse system of equations at each time step, it often results in less overall simulation time due to its ability to maintain accuracy with fewer iterations. 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