Hello,<\/p>\n
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I am trying to simulate the airflow around a 2D-wedge which is moving at hypersonic speed (Mach=8 at 30000 m).<\/p>\n
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I understand and have read that for my application pressure inlet, pressure outlet and pressure farfield boundary conditions are applicable.<\/p>\n
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My problem is that my solution won’t converge at all. I have tried changing the boundary conditions and the solution methods, switching on and off the turbulence modeling and so on.<\/p>\n
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Here are my settings:<\/p>\n
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Density based
Energy on
Viscous k-omega
Fluid: Air: Density ideal-gas and viscosity according to sutherland law<\/p>\n
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Boundary Conditions:
Inlet: Pressure inlet: I calculated a total pressure of p(total) = 2.93e8 Pa (isentropic relation with Ratio of Specific Heats = 1.4, Ma=8 and p(static, 30000 m, ISA)=301hPa. I set the “Gauge Total Pressure” to my calculated total pressure value. The “Supersonic\/Initial Gauge Presse” I set to my p(static). The temperature is 228.75 K (ISA, 30000 m)<\/p>\n
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Outlet: Pressure outlet: Here I set the “Gauge Pressure” to the aforementioned p(static) = 301hPa and the Temperature to 228.75 K.<\/p>\n
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The outer “walls” defined as pressure far field BoC: Ma = 8 and Gauge pressure to p(static) = 301hPa.<\/p>\n
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I also set the “Operating Pressure” to 0.<\/p>\n
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Solution Methods:<\/p>\n
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Implicit, Roe-FDS, Gradient: Least Squares, Flow, Turbulent Kinetic Energy and Specifiy Dissipation Rate: Second Order Upwind<\/p>\n
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Now first of all as I mentioned the solution doesn’t converge at all. Then when I check the Reference Values, I see that the calculated velocity in the inlet doesn’t represent the numbers I would have expected.<\/p>\n
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I would be very thankful if you could help me find the solution for my problem. I am new to CFD\/Ansys which is why I want to gain as much knowledge as possible.<\/p>\n
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Thank you very much.<\/p>\n","protected":false},"template":"","class_list":["post-44670","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["16851"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["3359"],"_bbp_subscription":["250933"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["44670"],"_bbp_forum_id":["27792"],"_bbp_engagement":["59","199","176774"],"_bbp_voice_count":["3"],"_bbp_reply_count":["13"],"_bbp_last_reply_id":["117291"],"_bbp_last_active_id":["117291"],"_bbp_last_active_time":["2020-06-10 13:46:18"]},"test":"cfdger"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/44670","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":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/44670\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=44670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}