{"id":459290,"date":"2026-06-04T00:14:30","date_gmt":"2026-06-04T00:14:30","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/rocky-2026-r1-student-fluent-journal-file-error-during-rocky-fluent-coupling\/"},"modified":"2026-06-04T00:14:30","modified_gmt":"2026-06-04T00:14:30","slug":"rocky-2026-r1-student-fluent-journal-file-error-during-rocky-fluent-coupling","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/rocky-2026-r1-student-fluent-journal-file-error-during-rocky-fluent-coupling\/","title":{"rendered":"Rocky 2026 R1 Student \u2013 Fluent Journal File Error During Rocky-Fluent Coupling"},"content":{"rendered":"<p>&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;I am using ANSYS Rocky 2026 R1 Student coupled with Fluent 2026 R1 Student for a CFD-DEM simulation.&lt;\/p&gt;&lt;h3&gt;Model Information&lt;\/h3&gt;<\/p>\n<ul>\n<li>&lt;p&gt;Rocky 2026 R1 Student&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Fluent 2026 R1 Student&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;CFD mesh: approximately 62,500 cells&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Geometry size: 200 &times; 200 &times; 100 &micro;m&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Approximately 75 particles generated successfully in Rocky&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Two-way Fluent coupling enabled&lt;\/p&gt;<\/li>\n<\/ul>\n<p>&lt;h3&gt;Problem Description&lt;\/h3&gt;&lt;p&gt;The coupled simulation does not proceed correctly after initialization.&lt;\/p&gt;&lt;p&gt;Rocky generates the particle bed successfully and Fluent launches. The coupling process begins, but Fluent reports the following messages:&lt;\/p&gt;<\/p>\n<pre>&lt;code class=\"language-text\"&gt;Warning: An error or interrupt occurred while reading the journal file.\nSome commands may not have been completed.\n<\/code><\/pre>\n<p>&lt;p&gt;and&lt;\/p&gt;<\/p>\n<pre>&lt;code class=\"language-text\"&gt;Error: CAR: invalid argument [1]: wrong type [not a pair]\nError Object: #f\n<\/code><\/pre>\n<p>&lt;h3&gt;Rocky Messages&lt;\/h3&gt;&lt;p&gt;Rocky also reports:&lt;\/p&gt;<\/p>\n<pre>&lt;code class=\"language-text\"&gt;averaging warning: target volume fraction of 0.48 not reached after 1000 iterations limit\n<\/code><\/pre>\n<p>&lt;p&gt;However, particles are successfully created and visible in the domain, so I am not sure whether this warning is related to the main failure.&lt;\/p&gt;&lt;h3&gt;Observations&lt;\/h3&gt;<\/p>\n<ul>\n<li>&lt;p&gt;Rocky starts normally.&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Particle generation completes.&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;CFD mesh is exported.&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Fluent and Rocky establish communication.&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Fluent then reports the journal-file error shown above.&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;The simulation does not advance as expected after this point.&lt;\/p&gt;<\/li>\n<\/ul>\n<p>&lt;h3&gt;Questions&lt;\/h3&gt;<\/p>\n<ol>\n<li>&lt;p&gt;Does the Fluent error&lt;\/p&gt;<\/li>\n<\/ol>\n<pre>&lt;code class=\"language-text\"&gt;Error: CAR: invalid argument [1]: wrong type [not a pair]\n<\/code><\/pre>\n<p>&lt;p&gt;indicate a corrupted journal file or coupling script?&lt;\/p&gt;<\/p>\n<ol start=\"2\">\n<li>&lt;p&gt;Could Rocky-Fluent coupling generate an invalid Fluent command during initialization?&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Is this a known issue in Rocky 2026 R1 Student \/ Fluent 2026 R1 Student?&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Which log files should I inspect to identify the command that caused the journal-file failure?&lt;\/p&gt;<\/li>\n<li>The setup is being operated from workbench<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/06\/04-06-2026-1780531867-Screenshot 2026-06-04 050416.png\" alt=\"\" \/><\/li>\n<\/ol>\n<p>&lt;p&gt;&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/06\/04-06-2026-1780531902-Screenshot 2026-06-04 044203.png\" alt=\"\" \/>&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/06\/04-06-2026-1780532006-Screenshot 2026-06-04 033133.png\" alt=\"\" \/>&lt;br&gt;Any guidance would be greatly appreciated.&lt;\/p&gt;&lt;p&gt;Thank you.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-459290","topic","type-topic","status-publish","hentry","topic-tag-cfd-dem","topic-tag-rocky-dem-1","topic-tag-two-way-coupling-fluent-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["459290"],"_bbp_subscription":["684477","642030"],"_bbp_author_ip":["119.152.129.250"],"_bbp_last_reply_id":["459388"],"_bbp_last_active_id":["459388"],"_bbp_last_active_time":["2026-06-05 12:45:20"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["684477","642030"],"_btv_view_count":["40"],"_bbp_topic_status":["unanswered"]},"test":"kamilayuumich-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/459290","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\/459290\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=459290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}