<\/p>\n
<\/p>\n
I’m trying to simulate a steady, 2D, internal, compressible flow through a channel. I have a pressure inlet [the flow is compressible so I can’t use a velocity inlet] and a pressure outlet.<\/span><\/p>\n <\/p>\n <\/p>\n <\/p>\n For the pressure inlet, the Reference Frame is Absolute, the Gauge Total Pressure is 691485 Pa, the Supersonic\/Initial Gauge Pressure is 0 Pa [simulating a Mach number of 2], the Direction Specification Method is Normal to Boundary, Prevent Reverse Flow is checked, and the Total Temperature is 518.67 K.<\/span><\/p>\n <\/p>\n <\/p>\n <\/p>\n For the pressure outlet, the Backflow Reference Frame is Absolute, the Gauge Pressure is 606174 Pa, the Pressure Profile Multiplier is 1, the Backflow Direction Specification Method is Normal to Boundary, the Backflow Pressure Specification is Static Pressure, the Average Pressure Specification Averaging Method is Weak, the Target Mass Flow Rate is 669.09 kg\/s [the upper and lower limits of absolute pressure are 5000000 and 1 Pa respectively], and 518.67 K. I’ve also tried it without Target Mass Flow Rate checked, but then my residuals explode sooner.<\/span><\/p>\n <\/p>\n <\/p>\n <\/p>\n My problem is that when I try running the calculations, when I check the contours, the inlet boundary conditions seem to be completely ignored by FLUENT. For example, the pressure is way too high and the velocity is way too low. I believe this is due to the fact that my initial values are much closer to the outlet values, but this is because if they’re too close to the inlet values [or even somewhere in the middle], then my residuals explode really quickly. They still explode even if the initial values are closer to the outlet values, but not until much later. How would you suggest I initialize this? Should I try patching different initial values at the inlet, outlet, and in the middle? I’ve never patched zones before, so I’m not sure how to do it.<\/span><\/p>\n <\/p>\n <\/p>\n <\/p>\n Any help would be greatly appreciated.<\/span><\/p>\n <\/p>\n <\/p>\n","protected":false},"template":"","class_list":["post-37635","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["9813"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["6515"],"_bbp_subscription":["241290"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["37635"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","166632","169961"],"_bbp_voice_count":["4"],"_bbp_reply_count":["10"],"_bbp_last_reply_id":["98586"],"_bbp_last_active_id":["98586"],"_bbp_last_active_time":["2019-11-16 01:48:28"]},"test":"manjuk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/37635","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\/37635\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=37635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}