{"id":403615,"date":"2025-01-05T19:33:39","date_gmt":"2025-01-05T19:33:39","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/"},"modified":"2025-01-05T19:33:39","modified_gmt":"2025-01-05T19:33:39","slug":"help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/","title":{"rendered":"Help card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force)"},"content":{"rendered":"<p>&lt;p&gt;Help card&lt;br&gt;I use fluent24.R2 bidirectional coupling with rocky24.2.0 (both are the latest version). The coupling program can run smothly, while it shows that&nbsp; the pressure gradient force for grains in rocky is always 0 (see below figure).&nbsp; I selected the item drag force and pressure gradient force in the module (CFDcouplingParticleStatistics). and the drag force can be calculated rightly. It seems to be a bug, because Rocky with version(24.1.0 R1) can output pressure gradient force.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/05-01-2025-1736105496-Screenshot 2025-01-05 203037.png\" alt=\"\" width=\"487\" height=\"227\" \/>&lt;\/p&gt;&lt;p&gt;If you have encountered and solved the problem, I hope you can receive the solution, thank you very much.&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-403615","topic","type-topic","status-publish","hentry","topic-tag-cfd-dem","topic-tag-drag-force","topic-tag-rocky-dem-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Help cardI use fluent24.R2 bidirectional coupling with rocky24.2.0 (both are the latest version). The coupling program can run smothly, while it shows that the pressure gradient force for grains in rocky is always 0 (see below figure). I selected the item drag force and pressure gradient force in the module (CFDcouplingParticleStatistics). and the drag force\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/\" \/>\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=\"Help card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force) | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Help cardI use fluent24.R2 bidirectional coupling with rocky24.2.0 (both are the latest version). The coupling program can run smothly, while it shows that the pressure gradient force for grains in rocky is always 0 (see below figure). I selected the item drag force and pressure gradient force in the module (CFDcouplingParticleStatistics). and the drag force\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2025-01-05T19:33:39+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-01-05T19:33:39+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Help card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force) | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Help cardI use fluent24.R2 bidirectional coupling with rocky24.2.0 (both are the latest version). The coupling program can run smothly, while it shows that the pressure gradient force for grains in rocky is always 0 (see below figure). I selected the item drag force and pressure gradient force in the module (CFDcouplingParticleStatistics). and the drag force\" \/>\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\\\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\\\/#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\\\/drag-force\\\/#listItem\",\"name\":\"drag-force\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/drag-force\\\/#listItem\",\"position\":3,\"name\":\"drag-force\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/drag-force\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\\\/#listItem\",\"name\":\"Help card\\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force)\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\\\/#listItem\",\"position\":4,\"name\":\"Help card\\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force)\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/drag-force\\\/#listItem\",\"name\":\"drag-force\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\\\/\",\"name\":\"Help card\\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force) | Ansys Learning Forum\",\"description\":\"Help cardI use fluent24.R2 bidirectional coupling with rocky24.2.0 (both are the latest version). The coupling program can run smothly, while it shows that the pressure gradient force for grains in rocky is always 0 (see below figure). I selected the item drag force and pressure gradient force in the module (CFDcouplingParticleStatistics). and the drag force\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\\\/#breadcrumblist\"},\"datePublished\":\"2025-01-05T19:33:39+00:00\",\"dateModified\":\"2025-01-05T19:33:39+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"Help card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force) | Ansys Learning Forum","description":"Help cardI use fluent24.R2 bidirectional coupling with rocky24.2.0 (both are the latest version). The coupling program can run smothly, while it shows that the pressure gradient force for grains in rocky is always 0 (see below figure). I selected the item drag force and pressure gradient force in the module (CFDcouplingParticleStatistics). and the drag force","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/#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\/drag-force\/#listItem","name":"drag-force"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/drag-force\/#listItem","position":3,"name":"drag-force","item":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/drag-force\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/#listItem","name":"Help card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force)"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/#listItem","position":4,"name":"Help card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force)","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/drag-force\/#listItem","name":"drag-force"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization","name":"Ansys Learning Forum","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/forum\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/","name":"Help card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force) | Ansys Learning Forum","description":"Help cardI use fluent24.R2 bidirectional coupling with rocky24.2.0 (both are the latest version). The coupling program can run smothly, while it shows that the pressure gradient force for grains in rocky is always 0 (see below figure). I selected the item drag force and pressure gradient force in the module (CFDcouplingParticleStatistics). and the drag force","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/#breadcrumblist"},"datePublished":"2025-01-05T19:33:39+00:00","dateModified":"2025-01-05T19:33:39+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Help card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force) | Ansys Learning Forum","og:description":"Help cardI use fluent24.R2 bidirectional coupling with rocky24.2.0 (both are the latest version). The coupling program can run smothly, while it shows that the pressure gradient force for grains in rocky is always 0 (see below figure). I selected the item drag force and pressure gradient force in the module (CFDcouplingParticleStatistics). and the drag force","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/","article:published_time":"2025-01-05T19:33:39+00:00","article:modified_time":"2025-01-05T19:33:39+00:00","twitter:card":"summary_large_image","twitter:title":"Help card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force) | Ansys Learning Forum","twitter:description":"Help cardI use fluent24.R2 bidirectional coupling with rocky24.2.0 (both are the latest version). The coupling program can run smothly, while it shows that the pressure gradient force for grains in rocky is always 0 (see below figure). I selected the item drag force and pressure gradient force in the module (CFDcouplingParticleStatistics). and the drag force"},"aioseo_meta_data":{"post_id":"403615","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2025-10-19 10:57:37","updated":"2025-10-19 10:57:37","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"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\/drag-force\/\" title=\"drag-force\">drag-force<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tHelp card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force)\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/forum\/topics\/"},{"label":"drag-force","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/drag-force\/"},{"label":"Help card\uff01FLUENT-ROCKY 2 way coupling errors (no Pressure Gradient Force)","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-cardfluent-rocky-2-way-coupling-errors-no-pressure-gradient-force\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["403615"],"_bbp_subscription":["342512","14847"],"_bbp_author_ip":["134.130.87.7"],"_bbp_last_reply_id":["404137"],"_bbp_last_active_id":["404137"],"_bbp_last_active_time":["2025-01-08 17:05:04"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["342512","14847"],"_btv_view_count":["342"],"_bbp_topic_status":["unanswered"]},"test":"b665e8efb11e4f1646692ddc20f81fcac1fbd3a0"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/403615","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/403615\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=403615"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}