{"id":403766,"date":"2025-01-06T17:14:26","date_gmt":"2025-01-06T17:14:26","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluid-induced-noise-in-the-t-junction-pipe-using-the-caa-method\/"},"modified":"2025-01-06T17:14:26","modified_gmt":"2025-01-06T17:14:26","slug":"fluid-induced-noise-in-the-t-junction-pipe-using-the-caa-method","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluid-induced-noise-in-the-t-junction-pipe-using-the-caa-method\/","title":{"rendered":"Fluid induced noise in the T-junction pipe using the CAA method"},"content":{"rendered":"<p>&lt;p&gt;Hi,&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;I am currently conducting simulations to analyze fluid-induced noise in a T-junction pipe using the Computational Aeroacoustics (CAA) method. The turbulence model employed in the simulation is LES, with the WALE model as the subgrid-scale model.&lt;\/p&gt;&lt;p&gt;In my simulations, the working fluid is gas, and I have tested two scenarios:&lt;\/p&gt;<\/p>\n<ol>\n<li><strong>Compressibility considered<\/strong>: The compressible fluid option was enabled, incorporating the bulk modulus of the gas.<\/li>\n<li><strong>Compressibility not considered<\/strong>: The fluid was treated as incompressible.<\/li>\n<\/ol>\n<p>&lt;p&gt;The results of these two scenarios show a significant difference. Specifically, when considering compressibility, the simulation exhibits large oscillations. I am uncertain which result is more accurate or if this difference is expected due to the nature of compressibility effects.&lt;\/p&gt;&lt;p&gt;here is the result:&nbsp;&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/06-01-2025-1736183222-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;To further investigate, I have also used different gas materials, including Peng-Robinson methane and NIST methane models. However, the results remain consistent with those obtained from the compressible gas simulation, showing similar oscillatory behavior.&lt;\/p&gt;&lt;p&gt;I would appreciate your insights on whether the large oscillations in the compressible fluid case are physically reasonable or if there might be an issue with the modeling approach. Additionally, any suggestions for further validation or adjustments to the simulation settings would be greatly helpful.&lt;\/p&gt;&lt;p&gt;Thank you for your time and assistance. I look forward to your feedback.&lt;br&gt;&lt;br&gt;Jingyu Liu&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-403766","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=\"Hi, I am currently conducting simulations to analyze fluid-induced noise in a T-junction pipe using the Computational Aeroacoustics (CAA) method. 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