{"id":442356,"date":"2025-09-26T02:35:29","date_gmt":"2025-09-26T02:35:29","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/could-not-access-to-the-momentum-option-in-the-boundary-condition\/"},"modified":"2025-09-26T02:35:29","modified_gmt":"2025-09-26T02:35:29","slug":"could-not-access-to-the-momentum-option-in-the-boundary-condition","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/could-not-access-to-the-momentum-option-in-the-boundary-condition\/","title":{"rendered":"Could not access to the momentum option in the boundary condition"},"content":{"rendered":"

<div data-olk-copy-source=”MessageBody”>I am simulating the thermal management of a battery pack consisting of 8 cylindrical batteries with constant heat generation. Horizontal fins are attached to the batteries for cooling, and the system is subjected to forced air convection.<\/div><div>Problem Description:<br>I am encountering an issue when defining the boundary conditions for the fin surfaces.<\/div><\/p>\n

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  1. <div role=”presentation”>Limited BC Options: When I select the wall surfaces of the fins, the boundary condition menu does not allow me to access the Momentum tab to define the wall motion. Only the Thermal tab is available. This prevents me from explicitly verifying and setting the wall to a “No-Slip” condition.<\/div><\/li>\n
  2. <div role=”presentation”>Incorrect Velocity at Walls: As a result of the above, when I run the simulation, I observe non-zero velocity values at the fin surfaces in the post-processing results. This is physically incorrect, as these solid walls should have a no-slip condition (velocity = 0 m\/s), which is skewing my results.<\/div><\/li>\n<\/ol>\n

    <div data-olk-copy-source=”MessageBody”>Could you please help me identify why the momentum boundary condition options are disabled for these wall surfaces and advise on how to correctly enforce the no-slip condition?<\/div><div>Thank you for your time and assistance.<\/div><\/p>\n","protected":false},"template":"","class_list":["post-442356","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["442356"],"_bbp_subscription":["600331","14700","199"],"_bbp_author_ip":["131.104.16.36"],"_bbp_last_reply_id":["443666"],"_bbp_last_active_id":["443666"],"_bbp_last_active_time":["2025-10-13 09:22:49"],"_bbp_reply_count":["13"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["600331","14700","199"],"_btv_view_count":["453"],"_bbp_topic_status":["unanswered"]},"test":"aalawiuoguelph-ca"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/442356","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\/442356\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=442356"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}