{"id":198559,"date":"2026-05-15T14:16:00","date_gmt":"2026-05-15T14:16:00","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/knowledge\/?post_type=topic&#038;p=198559"},"modified":"2026-05-15T14:19:04","modified_gmt":"2026-05-15T14:19:04","slug":"freeflow-faqs-which-solvers-support-sph-adaptive-size","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/freeflow-faqs-which-solvers-support-sph-adaptive-size\/","title":{"rendered":"[FreeFlow FAQs] Which solvers support SPH Adaptive Size?"},"content":{"rendered":"<h1  id=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-198416 size-full aligncenter\" src=\"https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/04\/GPU-Buying-guide-v1-1-e1777422962330.png\" alt=\"\" width=\"1920\" height=\"358\" srcset=\"https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/04\/GPU-Buying-guide-v1-1-e1777422962330.png 1920w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/04\/GPU-Buying-guide-v1-1-e1777422962330-300x56.png 300w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/04\/GPU-Buying-guide-v1-1-e1777422962330-1024x191.png 1024w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/04\/GPU-Buying-guide-v1-1-e1777422962330-768x143.png 768w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/04\/GPU-Buying-guide-v1-1-e1777422962330-1536x286.png 1536w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/04\/GPU-Buying-guide-v1-1-e1777422962330-24x4.png 24w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/04\/GPU-Buying-guide-v1-1-e1777422962330-36x7.png 36w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2026\/04\/GPU-Buying-guide-v1-1-e1777422962330-48x9.png 48w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><\/h1>\n<h1  id=\"WHICH-SOLVERS-SUPPORT-SPH-ADAPTIVE-SIZE\"><strong>Which solvers support SPH Adaptive Size?<\/strong><\/h1>\n<p>SPH Adaptive Size is supported with the following solvers:<\/p>\n<ul>\n<li><strong>Implicit Incompressible SPH (IISPH)<\/strong> \u2014 Default and recommended solver.<\/li>\n<\/ul>\n<div class=\"attachment\" style=\"background-color: #fedb8d;padding: 1%;font-weight: 300;height: auto!important;display: flex;border-radius: 15px;margin-bottom: 20px\">It is recommended to use IISPH with the Relaxed Incompressibility Constraint enabled and to calibrate the associated parameter to average element size in order to reduce pressure fluctuations that may affect simulation results.<\/div>\n<ul>\n<li><strong>Weakly Compressible SPH (WCSPH)<\/strong> \u2014 Available for specific use cases where compressibility effects are acceptable.<\/li>\n<\/ul>\n<p>The adaptive capability is fully integrated into the solver and does not require separate manual control during runtime.<\/p>\n<p>&nbsp;<\/p>\n<h6 class=\"paragraph\" style=\"text-align: right\" align=\"right\" class=\"paragraph\" style=\"text-align: right\" 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<p style=\"text-align: right\" xml:lang=\"EN-US\" align=\"right\"><strong><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-197810\" src=\"https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2025\/12\/author-foto.png\" alt=\"\" width=\"140\" height=\"143\" srcset=\"https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2025\/12\/author-foto.png 274w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2025\/12\/author-foto-24x24.png 24w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2025\/12\/author-foto-36x36.png 36w, https:\/\/innovationspace.ansys.com\/knowledge\/wp-content\/uploads\/sites\/4\/2025\/12\/author-foto-48x48.png 48w\" sizes=\"auto, (max-width: 140px) 100vw, 140px\" \/><\/strong><\/p>\n<h3 style=\"text-align: right\" style=\"text-align: right\"  id=\"JANAINA-OLIVEIRA\"><strong>Janaina Oliveira<\/strong><\/h3>\n<p style=\"text-align: right\"><em><strong>Technical\/Product Publications<\/strong><\/em><\/p>\n","protected":false},"template":"","class_list":["post-198559","topic","type-topic","status-publish","hentry","topic-tag-ansys-freeflow","topic-tag-ansys-freeflow-faqs","topic-tag-faqs-sph","topic-tag-freeflow-solvers","topic-tag-iisph","topic-tag-sph-adaptive-size","topic-tag-sph-faqs","topic-tag-wcsph","filter-by-application-ansys-freeflow","application-products-ansys-freeflow"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_edit_lock":["1778867916:17114"],"_edit_last":["17114"],"_aioseo_title":[null],"_aioseo_description":[null],"_aioseo_keywords":["a:0:{}"],"_aioseo_og_title":[null],"_aioseo_og_description":[null],"_aioseo_og_article_section":[""],"_aioseo_og_article_tags":["a:0:{}"],"_aioseo_twitter_title":[null],"_aioseo_twitter_description":[null],"application_name":[""],"_application_name":["field_64a80903c8e15"],"filter_by_optics_product":["Lumerical"],"_filter_by_optics_product":["field_64fb192ba3121"],"family":[""],"_family":["field_64a809229a857"],"siebel_km_number":[""],"_siebel_km_number":["field_63ecbffce60db"],"salesforce_km_number":[""],"_salesforce_km_number":["field_63ecc018e60dc"],"km_published_date":[""],"_km_published_date":["field_64c77704499dd"],"product_version":[""],"_product_version":["field_64c776cb4fd2e"],"_bbp_forum_id":["27796"],"_bbp_topic_id":["198559"],"_bbp_author_ip":["200.58.0.178"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["198560"],"_bbp_last_active_time":["2026-05-15 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