{"id":199046,"date":"2026-06-19T03:06:19","date_gmt":"2026-06-19T03:06:19","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/knowledge\/?post_type=topic&#038;p=199046"},"modified":"2026-06-19T03:14:01","modified_gmt":"2026-06-19T03:14:01","slug":"what-happens-to-sph-elements-during-sph-adaptive-refinement-in-ansys-freeflow","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/what-happens-to-sph-elements-during-sph-adaptive-refinement-in-ansys-freeflow\/","title":{"rendered":"What happens to SPH elements during SPH Adaptive refinement 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-HAPPENS-TO-SPH-ELEMENTS-DURING-SPH-ADAPTIVE-REFINEMENT-IN-ANSYS-FREEFLOW\"><strong>What happens to SPH elements during SPH Adaptive refinement in Ansys FreeFlow?<\/strong><\/h1>\n<p>When an SPH element is refined:<\/p>\n<ul>\n<li>It is replaced by smaller elements according to the selected refinement level<\/li>\n<li>The original element is replaced by multiple smaller elements<\/li>\n<li>The<strong> total volume (in 3D) remains unchanged<\/strong><\/li>\n<\/ul>\n<p><strong>Example (3D case)<\/strong><\/p>\n<ul>\n<li>Consider an SPH element whose size is equal to the <em>SPH size<\/em>.<\/li>\n<li>With refinement level 1:\n<ul>\n<li>The new SPH size becomes <em>SPH Size \/ 2<\/em><\/li>\n<li>The original element is replaced by <strong>8 smaller elements<\/strong><\/li>\n<li>Each new SPH element occupies one eighth of the original volume<\/li>\n<\/ul>\n<\/li>\n<li>With refinement level 2:\n<ul>\n<li>The original element is first subdivided into 8 smaller elements. Each resulting element is then further subdivided into 8 elements. After two levels of refinement, one SPH element is transformed into <strong>64 elements<\/strong>.<\/li>\n<li>Spacing between elements is reduced accordingly.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>This structured refinement ensures numerical stability and consistent element spacing.<\/p>\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<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-199046","topic","type-topic","status-publish","hentry","topic-tag-ansys-freeflow-faqs","topic-tag-ansys-freeflow-sph","topic-tag-freeflow-sph","topic-tag-sph-adaptive-size","topic-tag-sph-faqs","topic-tag-sph-simulations","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 happens to SPH elements during SPH Adaptive refinement in Ansys FreeFlow? When an SPH element is refined: It is replaced by smaller elements according to the selected refinement level The original element is replaced by multiple smaller elements The total volume (in 3D) remains unchanged Example (3D case) Consider an SPH element whose size\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/what-happens-to-sph-elements-during-sph-adaptive-refinement-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 happens to SPH elements during SPH Adaptive refinement in Ansys FreeFlow? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"What happens to SPH elements during SPH Adaptive refinement in Ansys FreeFlow? 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When an SPH element is refined: It is replaced by smaller elements according to the selected refinement level The original element is replaced by multiple smaller elements The total volume (in 3D) remains unchanged Example (3D case) Consider an SPH element whose 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