{"id":453963,"date":"2026-03-09T07:15:05","date_gmt":"2026-03-09T07:15:05","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/query-regarding-fluent-rocky-coupling-fixed-bed-ergun-correlation-issue\/"},"modified":"2026-03-09T07:15:05","modified_gmt":"2026-03-09T07:15:05","slug":"query-regarding-fluent-rocky-coupling-fixed-bed-ergun-correlation-issue","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/query-regarding-fluent-rocky-coupling-fixed-bed-ergun-correlation-issue\/","title":{"rendered":"Query Regarding Fluent-Rocky Coupling \u2013 Fixed Bed (Ergun Correlation) Issue"},"content":{"rendered":"<p>&lt;p&gt;&lt;span style=&#8221;color: #000000;&#8221;&gt;Hi all,&lt;br&gt;I am currently learning Fluent-Rocky coupled simulation, and I have encountered some issues for which I hope to seek advice. &lt;\/span&gt;&lt;br&gt;&lt;span style=&#8221;color: #000000;&#8221;&gt;I am trying to reproduce the&nbsp;<strong>Fixed Bed (Ergun Correlation)<\/strong> case from the <em>Rocky Verification Manual<\/em>. I have configured Fluent and Rocky strictly following the settings in the Manual. However, the particles in my model do not remain stationary as described in the Manual; instead, they gradually move upward toward the domain edges. I wonder whether this case requires imposing some constraint to fix the particles in the center of the model, or whether no constraints are applied, allowing the particles to maintain equilibrium under the combined effects of gravity and inlet flow velocity, thereby achieving positional stability.&lt;\/span&gt;&lt;br&gt;&lt;span style=&#8221;color: #000000;&#8221;&gt;Any guidance&lt;\/span&gt;&lt;span style=&#8221;color: #000000;&#8221;&gt; would be highly appreciated. &lt;\/span&gt;&lt;span style=&#8221;color: #000000;&#8221;&gt;Thanks in advance!&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;color: #000000;&#8221;&gt;t=0s<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/03\/09-03-2026-1773040206-mceclip0.png\" width=\"364\" height=\"182\" \/> t=0.5s<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/03\/09-03-2026-1773040244-mceclip1.png\" width=\"368\" height=\"183\" \/>t=1.0s<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/03\/09-03-2026-1773040308-mceclip2.png\" width=\"374\" height=\"187\" \/>&nbsp; in Manual:<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/03\/09-03-2026-1773040435-mceclip3.png\" width=\"266\" height=\"191\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/03\/09-03-2026-1773040459-mceclip4.png\" width=\"341\" height=\"191\" \/>&lt;\/span&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-453963","topic","type-topic","status-publish","hentry","topic-tag-cfd-dem","topic-tag-fluent","topic-tag-rocky-dem-1","topic-tag-verification-manual-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["453963"],"_bbp_subscription":["660139","66199"],"_bbp_author_ip":["211.21.92.116"],"_bbp_last_reply_id":["454659"],"_bbp_last_active_id":["454659"],"_bbp_last_active_time":["2026-03-17 16:19:21"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["660139","66199"],"_btv_view_count":["76"],"_bbp_topic_status":["unanswered"]},"test":"zhouhaoran18mails-ucas-ac-cn"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/453963","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\/453963\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=453963"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}