{"id":405479,"date":"2025-01-17T20:39:11","date_gmt":"2025-01-17T20:39:11","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/dpm-particles-are-not-heating-up-fast-enough\/"},"modified":"2025-01-17T21:13:35","modified_gmt":"2025-01-17T21:13:35","slug":"dpm-particles-are-not-heating-up-fast-enough","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/dpm-particles-are-not-heating-up-fast-enough\/","title":{"rendered":"DPM particles are not heating up fast enough"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;&lt;p&gt;I am working on a breakout model for one impinging injector into a combustion chamber using DPM. I am using EDM to model combustion. That being said, the multicomponent droplets are not heating up very fast so evaporation\/combustion isn&#8217;t occuring. It should be evaporating quickly after the impingment occurs instead of filling the whole domain. I have tried fixing the wall temp at 5000 to assist in convective heat transfer, but it doesnt seem to help. I have also tried patching in a high temp mid-simulation but it rapidly cools down before evaporation occurs&lt;\/p&gt;&lt;p&gt;Steady state&lt;\/p&gt;&lt;p&gt;energy on&lt;\/p&gt;&lt;p&gt;kw-sst turbulence model&lt;\/p&gt;&lt;p&gt;species transport&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li>eddy dissipation<\/li>\n<li>ethyl alcohol air mixture<\/li>\n<li>relax to chemical equilibirum<\/li>\n<\/ul>\n<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;&lt;p&gt;Discrete phase&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li>Interaction with continous phase<\/li>\n<li>unstead particle tracking<\/li>\n<li>update DPM sources every flow iteration<\/li>\n<li>DPM iteration interval = 1<\/li>\n<li>particle time step 1e-5<\/li>\n<li>max number of steps = 500<\/li>\n<li>Pressure dependent boiling<\/li>\n<li>temp dependent latent heat<\/li>\n<li>two-way turbulence coupling<\/li>\n<li>stochastic collision<\/li>\n<li>breakup<\/li>\n<li>volume displacement<\/li>\n<li>tried coupled heat-mass solution on but it seemed to do nothing<\/li>\n<\/ul>\n<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;&lt;p&gt;Multicomponent surface injections&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li>diameter = 0.0018542 m (equal to diameter of orifice as I want it to act as a continous liquid jet)<\/li>\n<li>flow rate 0.025 kg\/s for each injection<\/li>\n<li>two injections are 0.25 h2o(l), 0.75 c2h5oh(l), T=300k<\/li>\n<li>two injections are 1.0 o2(l), T=90k<\/li>\n<\/ul>\n<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;&lt;p&gt;Vaporization set to convection\/diffusion-controlled as evaporation should occur very quickly&lt;\/p&gt;&lt;p&gt;BC&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li>Pressure outlet (0 psi)<\/li>\n<li>wall set to 5000k (hope was this would result in evaporation but ideally it would be adiabatic)<\/li>\n<li>Operating Conditions set to 313.7 psi as this case will be used for high pressure combustion chamber<\/li>\n<\/ul>\n<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;&lt;p&gt;Standard initialization at 3000k, patched in whole region to 3000k in hopes evaporation to occur. All residuals converged except continuity&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/17-01-2025-1737146170-mceclip1.png\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/17-01-2025-1737146203-mceclip2.png\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/17-01-2025-1737148413-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-405479","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["405479"],"_bbp_author_ip":["172.91.69.229"],"_bbp_last_reply_id":["408287"],"_bbp_last_active_id":["408287"],"_bbp_last_active_time":["2025-02-04 10:14:53"],"_bbp_reply_count":["17"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["343144","199"],"_btv_view_count":["271"],"_bbp_topic_status":["unanswered"],"_edit_last":["343144"],"_bbp_revision_log":["a:3:{i:405480;a:2:{s:6:\"author\";i:343144;s:6:\"reason\";s:0:\"\";}i:405481;a:2:{s:6:\"author\";i:343144;s:6:\"reason\";s:0:\"\";}i:405482;a:2:{s:6:\"author\";i:343144;s:6:\"reason\";s:0:\"\";}}"],"_bbp_subscription":["199","343144"],"_bbp_likes_count":["1"]},"test":"zwernjaydengmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/405479","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":3,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/405479\/revisions"}],"predecessor-version":[{"id":405482,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/405479\/revisions\/405482"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=405479"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}