{"id":374090,"date":"2024-07-29T18:49:51","date_gmt":"2024-07-29T18:49:51","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fgm-combustion-les\/"},"modified":"2024-07-29T18:52:04","modified_gmt":"2024-07-29T18:52:04","slug":"fgm-combustion-les","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fgm-combustion-les\/","title":{"rendered":"FGM Combustion LES flame dying out"},"content":{"rendered":"

Hi, <\/p>\n

I am running a LES combustion simulation. I am running a swirling, non-premixed combustion methane case. The case I am running is a stable flame from the experiment. I have initialized my LES simulation from a converged reacting RANS case (coupled+ Least-Square Cell-Based, Pressure: Standard, First Order Upwind for all other equations (2nd order doesn’t show a stable flame). I have tried a lot of things, but the flame keeps dying. I have read a few papers that you guys have published recently and made sure I have the same setup but still same issue. <\/p>\n

Any suggestions of what I could possibly do? <\/p>\n

I am using the 22r2 version, would you recommend to change version and use the 2023r2? (I cant find release notes to see if there are any upgrades to the FGM combustion model). <\/p>\n

 <\/p>\n

Thank you for your help !!!<\/p>\n

Below are my setup:<\/p>\n

Fluent<\/p>\n

Version: 3d, dp, pbns, pdf20, LES, transient (3d, double precision, pressure-based, 20 species pdf, large eddy simulation, transient)<\/p>\n

Release: 22.2.0<\/p>\n

Under-Relaxation Factors<\/p>\n

 <\/p>\n

Variable Relaxation Factor<\/p>\n

—————————————–<\/p>\n

Pressure 0.75<\/p>\n

Density 0.75<\/p>\n

Body Forces 1<\/p>\n

Momentum 0.75<\/p>\n

Energy 0.89999998<\/p>\n

Temperature 1<\/p>\n

Progress Variable 0.80000001<\/p>\n

Mean Mixture Fraction 1<\/p>\n

 <\/p>\n

Linear Solver<\/p>\n

 <\/p>\n

Variable Solver Type Termination Criterion Residual Reduction Tolerance<\/p>\n

——————————————————————————————<\/p>\n

Pressure F-Cycle 0.01<\/p>\n

X-Momentum Flexible 0.1 0.7<\/p>\n

Y-Momentum Flexible 0.1 0.7<\/p>\n

Z-Momentum Flexible 0.1 0.7<\/p>\n

Energy F-Cycle 0.1<\/p>\n

Progress Variable Flexible 0.1 0.7<\/p>\n

Mean Mixture Fraction Flexible 0.1 0.7<\/p>\n

 <\/p>\n

Pressure-Velocity Coupling<\/p>\n

 <\/p>\n

Parameter Value<\/p>\n

—————————–<\/p>\n

Type SIMPLEC<\/p>\n

Skewness Correction 0<\/p>\n

 <\/p>\n

Discretization Scheme<\/p>\n

 <\/p>\n

Variable Scheme<\/p>\n

—————————————————-<\/p>\n

Pressure Second Order<\/p>\n

Density Second Order Upwind<\/p>\n

Momentum Bounded Central Differencing<\/p>\n

Energy Second Order Upwind<\/p>\n

Progress Variable Second Order Upwind<\/p>\n

Mean Mixture Fraction Second Order Upwind<\/p>\n

 <\/p>\n

Below is the species model tab: <\/p>\n

<\/a><\/p>\n","protected":false},"template":"","class_list":["post-374090","topic","type-topic","status-closed","hentry","topic-tag-cfd-combustion","topic-tag-fgm"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["256086","8124"],"_bbp_author_ip":["92.237.147.122"]," _bbp_last_reply_id":["0"],"_btv_view_count":["285"]," _bbp_likes_count":["0"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1722279053:256086"],"_bbp_topic_id":["374090"],"_bbp_forum_id":["27792"],"_bbp_engagement":["8124","256086"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["377333"],"_bbp_last_active_id":["377333"],"_bbp_last_active_time":["2024-08-06 07:36:37"]},"test":"6364efabeeef5556080a33c4b39700a3c8508bae"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/374090","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/374090\/revisions"}],"predecessor-version":[{"id":374091,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/374090\/revisions\/374091"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=374090"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}