{"id":463231,"date":"2026-09-03T14:04:53","date_gmt":"2026-09-03T14:04:53","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/porous-jump-model-error-pressure-rise-across-the-jump\/"},"modified":"2026-09-03T14:04:53","modified_gmt":"2026-09-03T14:04:53","slug":"porous-jump-model-error-pressure-rise-across-the-jump","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/porous-jump-model-error-pressure-rise-across-the-jump\/","title":{"rendered":"Porous jump model error?! Pressure rise across the jump"},"content":{"rendered":"<p>I am using Ansys Fluent 2024R1.<\/p>\n<p>I tested the porous jump model in the following simple setup:<\/p>\n<ul>\n<li>Geometry: pipe (L=15m, D=2.5m) followed by a nozzle (L=2m, contraction ratio=4.3)<\/li>\n<li>Flow model: incompressible (density=const.) \/RANS SST kw \/ steady<\/li>\n<li>Boundary conditions: inlet: velocity=6m\/s, outlet: static pressure=0Pa<\/li>\n<li>Porous jump (5m after the inlet): alpha=1e12m^2,delta m = 1.5e-3m and C2 = 660.5m^-1<\/li>\n<\/ul>\n<p>The solution converges in terms of residuals. However, I observe a&nbsp;<strong>rise in both static pressure and total pressure across the porous jump<\/strong>, whereas I would expect the porous jump to introduce a pressure loss, particularly a decrease in total pressure.<\/p>\n<p>Is there a known explanation for this behavior?&nbsp;<\/p>\n<p>Any suggestions on additional quantities or settings I should check would be appreciated.<\/p>\n","protected":false},"template":"","class_list":["post-463231","topic","type-topic","status-publish","hentry","topic-tag-porous","topic-tag-porous-coefficients-2","topic-tag-porous-jump","topic-tag-porous-jump-parameters-1","topic-tag-porous-model-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am using Ansys Fluent 2024R1. I tested the porous jump model in the following simple setup: Geometry: pipe (L=15m, D=2.5m) followed by a nozzle (L=2m, contraction ratio=4.3) Flow model: incompressible (density=const.) \/RANS SST kw \/ steady Boundary conditions: inlet: velocity=6m\/s, outlet: static pressure=0Pa Porous jump (5m after the inlet): alpha=1e12m^2,delta m = 1.5e-3m and\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/porous-jump-model-error-pressure-rise-across-the-jump\/\" \/>\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=\"Porous jump model error?! Pressure rise across the jump | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am using Ansys Fluent 2024R1. I tested the porous jump model in the following simple setup: Geometry: pipe (L=15m, D=2.5m) followed by a nozzle (L=2m, contraction ratio=4.3) Flow model: incompressible (density=const.) \/RANS SST kw \/ steady Boundary conditions: inlet: velocity=6m\/s, outlet: static pressure=0Pa Porous jump (5m after the inlet): alpha=1e12m^2,delta m = 1.5e-3m and\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/porous-jump-model-error-pressure-rise-across-the-jump\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-09-03T14:04:53+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-09-03T14:04:53+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Porous jump model error?! Pressure rise across the jump | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I am using Ansys Fluent 2024R1. I tested the porous jump model in the following simple setup: Geometry: pipe (L=15m, D=2.5m) followed by a nozzle (L=2m, contraction ratio=4.3) Flow model: incompressible (density=const.) \/RANS SST kw \/ steady Boundary conditions: inlet: velocity=6m\/s, outlet: static pressure=0Pa Porous jump (5m after the inlet): alpha=1e12m^2,delta m = 1.5e-3m and\" \/>\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\\\/forum\\\/forums\\\/topic\\\/porous-jump-model-error-pressure-rise-across-the-jump\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/porous\\\/#listItem\",\"name\":\"porous\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/porous\\\/#listItem\",\"position\":3,\"name\":\"porous\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/porous\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/porous-jump-model-error-pressure-rise-across-the-jump\\\/#listItem\",\"name\":\"Porous jump model error?! 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Pressure rise across the jump | Ansys Learning Forum","og:description":"I am using Ansys Fluent 2024R1. I tested the porous jump model in the following simple setup: Geometry: pipe (L=15m, D=2.5m) followed by a nozzle (L=2m, contraction ratio=4.3) Flow model: incompressible (density=const.) \/RANS SST kw \/ steady Boundary conditions: inlet: velocity=6m\/s, outlet: static pressure=0Pa Porous jump (5m after the inlet): alpha=1e12m^2,delta m = 1.5e-3m and","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/porous-jump-model-error-pressure-rise-across-the-jump\/","article:published_time":"2026-09-03T14:04:53+00:00","article:modified_time":"2026-09-03T14:04:53+00:00","twitter:card":"summary_large_image","twitter:title":"Porous jump model error?! Pressure rise across the jump | Ansys Learning Forum","twitter:description":"I am using Ansys Fluent 2024R1. I tested the porous jump model in the following simple setup: Geometry: pipe (L=15m, D=2.5m) followed by a nozzle (L=2m, contraction ratio=4.3) Flow model: incompressible (density=const.) \/RANS SST kw \/ steady Boundary conditions: inlet: velocity=6m\/s, outlet: static pressure=0Pa Porous jump (5m after the inlet): alpha=1e12m^2,delta m = 1.5e-3m and"},"aioseo_meta_data":[],"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/porous\/\" title=\"porous\">porous<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tPorous jump model error?! 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