{"id":430791,"date":"2025-05-05T11:00:39","date_gmt":"2025-05-05T11:00:39","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/question-about-differences-between-propeller-simulation-results\/"},"modified":"2025-06-17T16:28:21","modified_gmt":"2025-06-17T16:28:21","slug":"question-about-differences-between-propeller-simulation-results","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/question-about-differences-between-propeller-simulation-results\/","title":{"rendered":"Question About Differences Between Propeller Simulation Results"},"content":{"rendered":"<p>&lt;p&gt;Hello everyone,&lt;br&gt;I&#8217;m currently using ANSYS Fluent to simulate the aerodynamic behavior of a propeller using a rotating domain (MFR approach). While setting up the boundary conditions, I tried two different configurations:&lt;\/p&gt;&lt;p&gt;1.One inlet and one outlet&lt;\/p&gt;&lt;p&gt;2.Two outlets only (no inlet defined)&lt;\/p&gt;&lt;p&gt;The geometry and mesh remain identical in both cases. However, I observed that the simulation results from Model 2 (two outlets only) are much closer to the physical behavior I expect and align better with experimental data &mdash; particularly in terms of pressure distribution, velocity field, and total thrust. In contrast, the results from the one-inlet-one-outlet setup deviate significantly.&lt;\/p&gt;&lt;p&gt;I&rsquo;d like to ask the community:&lt;\/p&gt;&lt;p&gt;Why do the simulation results differ so noticeably between these two boundary setups, even though the flow direction is similar?&lt;br&gt;I&#8217;ve attached comparison images showing the results from both boundary condition setups.&lt;\/p&gt;&lt;p&gt;The first image shows the results from the one inlet + one outlet case.&lt;\/p&gt;&lt;p&gt;The second image shows the results from the two outlets only case.&lt;\/p&gt;&lt;p&gt;As seen in the figures, the flow field and pressure distribution in the two-outlet configuration appear more physically realistic and better match experimental expectations. Any feedback or suggestions based on these results would be greatly appreciated. Thank you in advance!&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/05\/05-05-2025-1746442806-mceclip0.png\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/05\/05-05-2025-1746442834-mceclip1.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-430791","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["311389"],"_bbp_topic_id":["430791"],"_bbp_author_ip":["59.125.76.249"],"_bbp_last_reply_id":["435615"],"_bbp_last_active_id":["435615"],"_bbp_last_active_time":["2025-06-30 06:27:53"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["1"],"_bbp_voice_count":["1"],"_btv_view_count":["2520"],"_bbp_topic_status":["answered"],"_edit_lock":["1750177446:2323"],"_bbp_status":["publish","publish"],"_bbp_spam_meta_status":["closed","answered"],"_bbp_subscription":["88"],"_bbp_engagement":["88"]},"test":"werv2486gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/430791","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/430791\/revisions"}],"predecessor-version":[{"id":434406,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/430791\/revisions\/434406"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=430791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}