{"id":198709,"date":"2026-05-22T19:32:35","date_gmt":"2026-05-22T19:32:35","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/knowledge\/?post_type=topic&#038;p=198709"},"modified":"2026-06-11T19:37:29","modified_gmt":"2026-06-11T19:37:29","slug":"what-is-sph-adaptive-size-coarsening-and-how-does-it-work-in-ansys-freeflow","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/what-is-sph-adaptive-size-coarsening-and-how-does-it-work-in-ansys-freeflow\/","title":{"rendered":"What is SPH Adaptive size coarsening, and how does it work in Ansys FreeFlow?"},"content":{"rendered":"<h1  id=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-198650 size-full\" src=\"https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/05\/Freeflow-FAQ-banner-v2.png\" alt=\"\" width=\"1600\" height=\"200\" srcset=\"https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/05\/Freeflow-FAQ-banner-v2.png 1600w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/05\/Freeflow-FAQ-banner-v2-300x38.png 300w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/05\/Freeflow-FAQ-banner-v2-1024x128.png 1024w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/05\/Freeflow-FAQ-banner-v2-768x96.png 768w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/05\/Freeflow-FAQ-banner-v2-1536x192.png 1536w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/05\/Freeflow-FAQ-banner-v2-24x3.png 24w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/05\/Freeflow-FAQ-banner-v2-36x5.png 36w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/05\/Freeflow-FAQ-banner-v2-48x6.png 48w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\" \/><\/h1>\n<h1  id=\"WHAT-IS-SPH-ADAPTIVE-SIZE-COARSENING-AND-HOW-DOES-IT-WORK-IN-ANSYS-FREEFLOW\"><strong>What is SPH Adaptive size coarsening, and how does it work in Ansys FreeFlow?<\/strong><\/h1>\n<p>Coarsening is the process of <strong>reducing SPH resolution<\/strong> when refined elements are no longer needed.<\/p>\n<div class=\"attachment\" style=\"background-color: #fedb8d;padding: 1%;font-weight: 300;height: auto!important;display: flex;border-radius: 15px;margin-bottom: 20px\">Without coarsening, the number of SPH elements would continuously increase, leading to excessive computational cost.<\/div>\n<p>Ansys FreeFlow applies <strong>automatic coarsening<\/strong> to maintain efficiency.<\/p>\n<ul>\n<li>Coarsening is performed <strong>every 5 solver iterations<\/strong> (fixed behavior)<\/li>\n<li>Instead of merging many elements at once, the solver <strong>merges SPH elements two by two<\/strong><\/li>\n<li>This gradual process avoids numerical instabilities and mass loss<\/li>\n<\/ul>\n<p>Two SPH elements are coarsened only if <strong>all three conditions below are satisfied<\/strong>:<\/p>\n<ol>\n<li><strong>Distance from geometry<\/strong><br \/>\nThe elements must be far enough from any geometry boundary:<\/p>\n<ul>\n<li>Distance &gt; Refinement Distance Factor \u00d7 Initial SPH Size<br \/>\nThis prevents instability near walls.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Refinement level compatibility<\/strong><br \/>\nEach SPH element tracks its refinement history.<\/p>\n<ul>\n<li>Coarsening occurs only if the combined refinement count is below the maximum allowed by the refinement level.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Distance between elements<\/strong><br \/>\nThe two elements must be close enough to each other:<\/p>\n<ul>\n<li>Their distance must be smaller than the average smoothing length<\/li>\n<li>The smoothing length is computed using the Kernel Distance Factor and the SPH element size.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<div class=\"packages-rocky\">\n<div class=\"additional-package-rocky col-md-5\">\n<p>Access more FAQs and Tips in the page:<\/p>\n<div><a class=\"download\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/ansys-freeflow-faqs-and-tips\/\" target=\"_blank\" rel=\"noopener\">FreeFlow FAQs and Tips<\/a><\/div>\n<\/div>\n<\/div>\n<div>\n<h6 class=\"paragraph\" style=\"text-align: center\" align=\"right\" class=\"paragraph\" style=\"text-align: center\" align=\"right\"  id=\"ANSYS-FREEFLOW-SMOOTHED-PARTICLE-HYDRODYNAMICS-SPH-SIMULATION-SOFTWARE\"><span class=\"eop\"><span style=\"font-size: 16.0pt\"><em>Ansys FreeFlow\u2122 smoothed-particle hydrodynamics (SPH) simulation software<\/em> <\/span><\/span><\/h6>\n<\/div>\n","protected":false},"template":"","class_list":["post-198709","topic","type-topic","status-publish","hentry","topic-tag-ansys-freeflow","topic-tag-ansys-freeflow-faqs","topic-tag-coarsening","topic-tag-faqs","topic-tag-freeflow","topic-tag-freeflow-sph","topic-tag-sph","topic-tag-sph-adaptive-size","filter-by-application-ansys-freeflow","application-products-ansys-freeflow"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"What is SPH Adaptive size coarsening, and how does it work in Ansys FreeFlow? 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Coarsening is performed\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/what-is-sph-adaptive-size-coarsening-and-how-does-it-work-in-ansys-freeflow\/\" \/>\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 Knowledge | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"What is SPH Adaptive size coarsening, and how does it work in Ansys FreeFlow? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"What is SPH Adaptive size coarsening, and how does it work in Ansys FreeFlow? Coarsening is the process of reducing SPH resolution when refined elements are no longer needed. 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