{"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":"2026-06-11T19:35:57","modified_gmt":"2026-06-11T19:35:57","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":"Which Ansys FreeFlow solvers support SPH Adaptive Size?"},"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=\"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<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<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\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","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":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Which solvers support SPH Adaptive Size? SPH Adaptive Size is supported with the following solvers: Implicit Incompressible SPH (IISPH) \u2014 Default and recommended solver. 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\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/freeflow-faqs-which-solvers-support-sph-adaptive-size\/\" \/>\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=\"Which Ansys FreeFlow solvers support SPH Adaptive Size? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"Which solvers support SPH Adaptive Size? SPH Adaptive Size is supported with the following solvers: Implicit Incompressible SPH (IISPH) \u2014 Default and recommended solver. 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\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/freeflow-faqs-which-solvers-support-sph-adaptive-size\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-05-15T14:16:00+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-06-11T19:35:57+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Which Ansys FreeFlow solvers support SPH Adaptive Size? | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Which solvers support SPH Adaptive Size? SPH Adaptive Size is supported with the following solvers: Implicit Incompressible SPH (IISPH) \u2014 Default and recommended solver. 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\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/freeflow-faqs-which-solvers-support-sph-adaptive-size\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/ansys-freeflow\\\/#listItem\",\"name\":\"ansys freeflow\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/ansys-freeflow\\\/#listItem\",\"position\":3,\"name\":\"ansys freeflow\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/ansys-freeflow\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/freeflow-faqs-which-solvers-support-sph-adaptive-size\\\/#listItem\",\"name\":\"Which Ansys FreeFlow solvers support SPH Adaptive Size?\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/freeflow-faqs-which-solvers-support-sph-adaptive-size\\\/#listItem\",\"position\":4,\"name\":\"Which Ansys FreeFlow solvers support SPH Adaptive Size?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/ansys-freeflow\\\/#listItem\",\"name\":\"ansys freeflow\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/freeflow-faqs-which-solvers-support-sph-adaptive-size\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/freeflow-faqs-which-solvers-support-sph-adaptive-size\\\/\",\"name\":\"Which Ansys FreeFlow solvers support SPH Adaptive Size? | Ansys Knowledge\",\"description\":\"Which solvers support SPH Adaptive Size? 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