{"id":370590,"date":"2024-07-04T23:45:13","date_gmt":"2024-07-04T23:45:13","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-swirl-combustor-solver-settings\/"},"modified":"2024-07-04T23:45:13","modified_gmt":"2024-07-04T23:45:13","slug":"high-swirl-combustor-solver-settings","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-swirl-combustor-solver-settings\/","title":{"rendered":"High Swirl Combustor Solver Settings"},"content":{"rendered":"<p>I trying to run a simulation of a combustor with air flowing in annularly and then swirling around a fuel inlet. The 8 blades were angled such that the swirl number is 3, and the overall cylinder is 15 cm in diameter and over 150 cm in length. A polyhedral mesh consisting of over 700,000 cells and a 15-layer smooth transition boundary layer was used, as it&#8217;s the only way I&#8217;ve found to consistently stay within the confines of the student license limit.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/04-07-2024-1720135126-mceclip0.png\" width=\"564\" height=\"395\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/04-07-2024-1720136432-mceclip3.png\" width=\"881\" height=\"237\"><\/p>\n<p>The combustion model used is Non-Premixed Steady Diffusion Flamelet with Inlet Diffusion, Compressibility Effects, and P1 Radiation enabled. The Coupled Psuedo-Transient solver is used and everything is set to second-order. The under-relaxation factors are left at default. I&#8217;ve read in papers and forum posts that the Reynold&#8217;s Stress Model (RSM) is the best turbulence model to use for a high swirl situation such as this, but I&#8217;ve yet to find, even in the User and Theory Guides, if Linear Pressure-Strain (LPS), Quadratic Pressure-Strain (QPS), Stress-Omega (SO), or Stress-BSL (SBSL) is the best variation to use for high swirl or even simply how to best set up the solver to handle a high swirl combustion simulation. QPS always ends in floating point error in anything I&#8217;ve tried to use it in, and the other three immediately start with extremely high residiuals no matter the intialization type I use as shown below with a run using RSM-SO:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/04-07-2024-1720136068-mceclip1.png\" width=\"540\" height=\"396\"><\/p>\n<p>I&#8217;ve hit a roadblock on this one, and any guidance I get on more appropriate solver settings to reach baseline convergence will be greatly appreciated.<\/p>\n","protected":false},"template":"","class_list":["post-370590","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["82"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["8124"],"_bbp_topic_id":["370590"],"_bbp_forum_id":["27792"],"_bbp_engagement":["8124","302346"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["370926"],"_bbp_last_active_id":["370926"],"_bbp_last_active_time":["2024-07-08 10:08:21"]},"test":"abtharpe42tntech-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/370590","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\/370590\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=370590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}