{"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":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello everyone,I&#039;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:1.One inlet and one outlet2.Two outlets only (no inlet defined)The geometry and mesh remain identical in both cases. However, I observed that the simulation results\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/question-about-differences-between-propeller-simulation-results\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Question About Differences Between Propeller Simulation Results | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello everyone,I&#039;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:1.One inlet and one outlet2.Two outlets only (no inlet defined)The geometry and mesh remain identical in both cases. However, I observed that the simulation results\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/question-about-differences-between-propeller-simulation-results\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2025-05-05T11:00:39+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-06-17T16:28:21+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Question About Differences Between Propeller Simulation Results | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello everyone,I&#039;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:1.One inlet and one outlet2.Two outlets only (no inlet defined)The geometry and mesh remain identical in both cases. However, I observed that the simulation results\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/question-about-differences-between-propeller-simulation-results\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/question-about-differences-between-propeller-simulation-results\\\/#listItem\",\"name\":\"Question About Differences Between Propeller Simulation Results\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/question-about-differences-between-propeller-simulation-results\\\/#listItem\",\"position\":3,\"name\":\"Question About Differences Between Propeller Simulation Results\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/question-about-differences-between-propeller-simulation-results\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/question-about-differences-between-propeller-simulation-results\\\/\",\"name\":\"Question About Differences Between Propeller Simulation Results | Ansys Learning Forum\",\"description\":\"Hello everyone,I'm currently using ANSYS Fluent to simulate the aerodynamic behavior of a propeller using a rotating domain (MFR approach). 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