{"id":358192,"date":"2024-03-20T17:40:13","date_gmt":"2024-03-20T17:40:13","guid":{"rendered":"\/forum\/forums\/reply\/358192\/"},"modified":"2024-03-20T17:40:13","modified_gmt":"2024-03-20T17:40:13","slug":"358192","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/358192\/","title":{"rendered":"Reply To: Problem setup for shock wave hitting turbine blade"},"content":{"rendered":"<p>&lt;p&gt;Modeling shock waves in an axial turbine involves prescribing the correct boundary conditions.&nbsp; It&#8217;s also helpful in most cases to start from a subsonic solution and gradually modify the boundary conditions to the prescribed inlet\/outlet conditions that will achieve supersonic flow in the turbine.&nbsp; A typical case is a supersonic turbine stage where the flow enters the stator as subsonic flow, is accelerated to surpersonic flow at the stator outlet and enters the rotor.&nbsp; If the rotor is designed well, there should be no shocks within the rotor passage except perhaps near the trailing edge. Running this type of case off-design might trigger shocks in the rotor passage due to leading edge incidence effects.&lt;\/p&gt;&lt;p&gt;The approach to this case where the flow is entering the model as subsonic flow and exiting as supersonic flow is the following:&lt;\/p&gt;&lt;p&gt;-Start with the prescribed inlet total pressure, temperature using&nbsp; a subsonic inlet condition&lt;\/p&gt;&lt;p&gt;-Set the outlet pressure to a value that would achieve subsonic conditions in the turbine (e.g. use a value &gt;0.5*Inlet total pressure)&lt;\/p&gt;&lt;p&gt;-Gradually decrease the outlet pressure in stages until the outlet flow reaches Ma&gt;=1 over the entire outlet.&nbsp; Switch from a subsonic outlet pressure boundary condition to a supersonic (i.e. extrapolation) boundary condition.&lt;\/p&gt;&lt;p&gt;In some cases, using a Local Time Scale Factor may help with convergence if both subsonic and supersonic flow are present in the model.&nbsp; Use a value between 3-10.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-358192","reply","type-reply","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=\"Modeling shock waves in an axial turbine involves prescribing the correct boundary conditions. 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