{"id":397207,"date":"2024-12-12T08:08:26","date_gmt":"2024-12-12T08:08:26","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/transmit-boundary-reflection-perturbation-of-pressure-waves\/"},"modified":"2024-12-12T08:08:26","modified_gmt":"2024-12-12T08:08:26","slug":"transmit-boundary-reflection-perturbation-of-pressure-waves","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/transmit-boundary-reflection-perturbation-of-pressure-waves\/","title":{"rendered":"Transmit boundary &#8211; reflection \/ perturbation of pressure waves"},"content":{"rendered":"<p>&lt;p&gt;Dear all,&lt;\/p&gt;&lt;p&gt;I am using Ansys Autodyn 2023 R2 to simulate the impact of an energy beam.&lt;\/p&gt;&lt;p&gt;For this simulation I am using an Eulerian mesh, no failure or strength model, and I apply only one boundary condition at the upper radius (0.4mm cf. images) which is &#8220;Transmit (Euler\/Lagrange)&#8221;. All references in the boundary definition are set to zero.&lt;\/p&gt;&lt;p&gt;I do not understand why my pressure wave is disturbed by this boundary condition. Should it not allow the wave to pass through as if the material were continuous?&lt;\/p&gt;&lt;p&gt;Below is a comparison of the results obtained without the boundary condition (total reflection of the wave) and with the transmit condition (creation of a disturbance with a large amplitude).&lt;\/p&gt;&lt;p&gt;How can I solve this problem without enlarging my part?&lt;\/p&gt;&lt;p&gt;Thank you for your help,&lt;\/p&gt;&lt;p&gt;Audrey&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/12-12-2024-1733988669-Pressure_cut_the_part_04mm_no_BC_800.png\" alt=\"No_boundary_condition_cycle_800\" width=\"929\" height=\"581\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/12-12-2024-1733988737-Pressure_cut_the_part_04mm_no_BC_900.png\" alt=\"No_boundary_condition_cycle_900\" width=\"936\" height=\"596\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/12-12-2024-1733988768-Pressure_cut_the_part_04mm_transmit_800.png\" alt=\"Transmit_boundary_condition_cycle_800\" width=\"934\" height=\"600\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/12-12-2024-1733989378-Pressure_cut_the_part_04mm_transmit_900.png\" alt=\"Transmit_boundary_condition_cycle_900\" width=\"938\" height=\"591\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-397207","topic","type-topic","status-publish","hentry","topic-tag-ansys-autodyn-1","topic-tag-boundary-conditions"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Dear all,I am using Ansys Autodyn 2023 R2 to simulate the impact of an energy beam.For this simulation I am using an Eulerian mesh, no failure or strength model, and I apply only one boundary condition at the upper radius (0.4mm cf. images) which is &quot;Transmit (Euler\/Lagrange)&quot;. 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