Hello,<\/p>\n
<\/p>\n
I’m trying to simulate steady laminar 2D pressure driven flow between two parallel plates in the slip regime with Knudsen number (Kn = 0.05). I was able to turn on the low pressure boundary slip (LPBS) in Fluent by turning on the energy equation so the option will appear at the bottom of the models window. I also have read that in order for the model to apply slip, the Lennard-Jones length has to be adjusted based on the desired pressure, Knudsen number, and the characteristic length. This can be done easily using Eq. (7.2-17) in Fluent 12.0 Theory Guide. With these modifications, I was able to have a slip at the walls of the channel without changing the wall boundary condition. My questions are:<\/p>\n
<\/p>\n
1- What is the limit of low pressure in order for the LPBS to work accurately? is there a threshold of the low pressure in order for this model to work? Can I use a very small length scale with near atmospheric pressure “and adjust L-J number accordingly” to have slip?<\/p>\n
<\/p>\n
2- Does the operating pressure in the setup window need to be altered or modified?<\/p>\n
<\/p>\n
3- Can the LPBS be used with SIMPLE, SIMPLEC, PISO, COUPLED, or only with a specific one?<\/p>\n
<\/p>\n
If anyone has any experience with the LPBS model and in the slip flow simulation using FLUENT and are willing to answer my questions and share their experience, I will highly appreciate it.<\/p>\n
<\/p>\n
Thanks,<\/p>\n
<\/p>\n
Sultan<\/p>\n","protected":false},"template":"","class_list":["post-37164","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["9339"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["closed"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_status":["publish"],"_bbp_likes_count":["0","0","0","0","0"],"_btv_view_count":["1180"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["37164"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","167124","184866"],"_bbp_voice_count":["3"],"_bbp_reply_count":["10"],"_bbp_last_reply_id":["138495"],"_bbp_last_active_id":["138495"],"_bbp_last_active_time":["2021-01-12 15:07:25"]},"test":"alshareef"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/37164","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\/37164\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=37164"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}