{"id":254945,"date":"2020-12-04T14:49:39","date_gmt":"2020-12-04T14:49:39","guid":{"rendered":"\/forum\/forums\/topic\/settings-of-reference-gravity-pressure-and-density\/"},"modified":"2022-08-18T05:11:28","modified_gmt":"2022-08-18T05:11:28","slug":"settings-of-reference-gravity-pressure-and-density","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/settings-of-reference-gravity-pressure-and-density\/","title":{"rendered":"Settings of reference gravity, pressure and density"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-244166\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/discovery\/2020\/12\/141.png\" alt=\"\" width=\"485\" height=\"343\" \/><\/p>\n<p>The problem depicted is a cubical cavity filled with air. The left wall of the domain is cold\u00a0with a fixed temperature, the left\u00a0wall is cold with a fixed temperature. Goal of this simulation is to visualize the natural convection occurring in a setup like this. The walls on top, bottom, front and back are insulated walls. The temperature difference between warm and cold wall is small, the Boussinesq Approximation therefor to my knowledge applicable. Ideally I would like to set the fluid material to air as an ideal fluid.<\/p>\n<p>Is air in the discovery library acting like an ideal fluid?<\/p>\n<p>Furthermore, since buoyancy and gravity are relevant for this simulation, I was wondering what the default value for the gravity was and if it is possible to change it anywhere? Since I would like to calculate natural convection for different Rayleigh Numbers, I would like to specify a reference density and operating pressure for my system. Is there a way to implement this in Discovery? If not, what is the default operating pressure and density used in fluid simulations?<\/p>\n<p>Thank you very much for all comments, clarifications\u00a0and inputs regarding this problem!<\/p>\n","protected":false},"template":"","class_list":["post-254945","topic","type-topic","status-closed","hentry","topic-tag-ansys-discovery"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["278523"],"_bbp_likes_count":["0"],"_btv_view_count":["1137"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["254945"],"_bbp_forum_id":["27789"],"_bbp_engagement":["3452","278523"],"_bbp_voice_count":["2"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["263151"],"_bbp_last_active_id":["263151"],"_bbp_last_active_time":["2020-12-08 09:14:34"]},"test":"klara-marekdraeger-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/254945","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\/254945\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=254945"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}