{"id":392621,"date":"2024-11-04T16:30:19","date_gmt":"2024-11-04T16:30:19","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392621\/"},"modified":"2024-11-04T16:30:19","modified_gmt":"2024-11-04T16:30:19","slug":"392621","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392621\/","title":{"rendered":"Reply To: Pure Ammonia Laminar Flame Speed with FGM Combustion"},"content":{"rendered":"<p>&lt;p&gt;Over the weekend I figured out what was going on, and it might be a bug in 2023 R1. I&#8217;m having the same issue in 2024 R1 on a different device, so the bug might be there too.&lt;\/p&gt;&lt;p&gt;If I&nbsp;<em>generate&nbsp;<\/em>the flamelets in the FGM model, generate the lookup table, and then check the PDF mixture material properties, the &#8220;laminar-flame-speed-computed&#8221; (LFSC) option was available as shown below:&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/04-11-2024-1730735072-mceclip0.png\" width=\"527\" height=\"274\" \/>&lt;\/p&gt;&lt;p&gt;When I switched to LFSC and then recalculated the properties in the FGM model under the &#8220;Properties&#8221; tab, the resulting flame speed numbers were corrected for ammonia combustion.&nbsp;However, if I&nbsp;<em>imported&nbsp;<\/em>a set of pregenerated flamelets into the FGM model OR&nbsp;<em>duplicated<\/em> a project where a FGM simulation was already completed without LFSC enabled, the LFSC option in the pdf mixture material properties was gone.&nbsp;Also, if a FGM simulation was ran after&nbsp;<em>generating<\/em> the flamelets and without enabling LFSC before running the calculation, the LFSC option disappears.&nbsp;&lt;\/p&gt;&lt;p&gt;This has been a massive headache, but I figured it out. The major problem with all of this is that the LFSC option disappears entirely beyond the initially setup and I don&#8217;t know what to do to bring it back. I could find no information about these challenges regarding the FGM laminar flame speed property online or in the User\/Theory Guides. I will say that I ended up trying the &#8220;laminar-flame-speed-library&#8221; (LFSL) option as it was consistently available throughout all of this, and it also fixed the flame speed values for ammonia combustion, but I currently don&#8217;t know if it&#8217;s able to handle a mixture of different fuels.&lt;\/p&gt;&lt;p&gt;Thanks for the help, I just wish I could reenable the LFSC option after the fact.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392621","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/392621","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/392621\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=392621"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}