{"id":47863,"date":"2020-09-04T03:27:14","date_gmt":"2020-09-04T03:27:14","guid":{"rendered":"\/forum\/forums\/topic\/how-to-model-roughness-in-fluent\/"},"modified":"2020-09-04T03:27:14","modified_gmt":"2020-09-04T03:27:14","slug":"how-to-model-roughness-in-fluent","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-model-roughness-in-fluent\/","title":{"rendered":"How to model roughness in FLUENT"},"content":{"rendered":"<p>We are modeling open channel flows. We need to investigate the effect of bed roughness height on flow patterns. What is the maximum value of roughness height (m) FLUENT can simulate by adding the height in the wall boundary conditions? We found that the y+ values with rough wall become much greater than 5 when we use near-wall turbulence models whereas y+ for smooth wall with the same turbulence model is less than 5. We assume that when the roughness height is large, we will have to resolve it in our geometry instead of adding it as a modeling parameter. Is that right?n<\/p>\n","protected":false},"template":"","class_list":["post-47863","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["20073"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["?e??"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["3858"],"_bbp_subscription":["237403"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["47863"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","159560"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["127014"],"_bbp_last_active_id":["127014"],"_bbp_last_active_time":["2020-09-13 22:54:15"]},"test":"xinguidaho-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/47863","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\/47863\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=47863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}