{"id":54179,"date":"2021-04-02T21:57:24","date_gmt":"2021-04-02T21:57:24","guid":{"rendered":"\/forum\/forums\/topic\/specularity-coefficient\/"},"modified":"2021-04-02T21:57:24","modified_gmt":"2021-04-02T21:57:24","slug":"specularity-coefficient","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/specularity-coefficient\/","title":{"rendered":"Specularity coefficient"},"content":{"rendered":"<p>Hello,I am currently simulating a fluidized bed reactor. The flow field is laminar. I am using a Eulerian Eulerian model with algebraic granular temperature formulation, Gidaspow drag model and the typical models for bulk, granular viscosity ecc. As for the boundary conditions at the wall I imposed a specularity coefficient of 0.6.Now, when I analyze simulation&#8217;s results I can see that even if I am actually imposing a partial slip boundary condition at the wall, the axial velocity of the solid particles is always equal to zero. Even if I change the values of the specularity coefficient, nothing seems to change. The only way to have an actual slip along the walls is to impose a zero shear stress at the wall.Could you help me understand why velocity is always equal to zero? Is it wrong?Thank youn<\/p>\n","protected":false},"template":"","class_list":["post-54179","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["26507"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["?\u0019O?"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1089"],"_bbp_subscription":["232604","254058"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["54179"],"_bbp_forum_id":["27792"],"_bbp_engagement":["5120","186068","254058"],"_bbp_voice_count":["3"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["239390"],"_bbp_last_active_id":["239390"],"_bbp_last_active_time":["2022-11-01 18:48:06"]},"test":"orland_one"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/54179","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\/54179\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=54179"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}