{"id":49521,"date":"2020-11-03T07:20:21","date_gmt":"2020-11-03T07:20:21","guid":{"rendered":"\/forum\/forums\/topic\/acoustic-courant-number-in-ansys-cfx\/"},"modified":"2020-11-03T07:20:21","modified_gmt":"2020-11-03T07:20:21","slug":"acoustic-courant-number-in-ansys-cfx","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/acoustic-courant-number-in-ansys-cfx\/","title":{"rendered":"Acoustic Courant Number in Ansys CFX"},"content":{"rendered":"<p>Hi everybody,ndoes anyone know the equation used in CFX to calculate the acoustic mach number? I know this one here:nCFL = a * delta_t \/ delat_x &#8230; with a = speed of sound, delta_x = related grit distance, delta_t = simulation time stepnThe problem is&#8230; I calculate a simualtion time step be means of the above equation as a function of a CFL number of for example 1. But later on the results show that the courant number calculated by ansys is 3. What does it mean? nMany thanks in advance for any kind of helpnChristian Lehrn<\/p>\n","protected":false},"template":"","class_list":["post-49521","topic","type-topic","status-closed","hentry","topic-tag-acoustics","topic-tag-boundary-conditions","topic-tag-cfx"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["21759"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["?\u0001?`"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1046"],"_bbp_subscription":["244712"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["49521"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","170334"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["132069"],"_bbp_last_active_id":["132069"],"_bbp_last_active_time":["2020-11-04 14:21:35"]},"test":"christijaaan"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/49521","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\/49521\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=49521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}