{"id":235166,"date":"2022-09-13T18:49:29","date_gmt":"2022-09-13T18:49:29","guid":{"rendered":"\/forum\/forums\/topic\/dpm-model-vs-ddpm-model\/"},"modified":"2022-09-13T18:49:29","modified_gmt":"2022-09-13T18:49:29","slug":"dpm-model-vs-ddpm-model","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/dpm-model-vs-ddpm-model\/","title":{"rendered":"DPM model VS DDPM model"},"content":{"rendered":"<p>Hello Sirs,<\/p>\n<p>I am relatively new with the Fluent, and I need to clarify some questions,&nbsp;<\/p>\n<p>I am currently modeling a fluid of solid particles and air with the Eulerian-Lagrangian approach, which those characteristics:<br \/>Particle &#8211;&gt; diameter 0.0002m<br \/>Volume fraction&#8211;&gt; 0.0012<br \/>Pressure gradient &#8211;&gt; 198 Pa\/m<br \/>Specularity coefficient &#8211;&gt; 0.002<br \/>coefficient of restitution particle-particle&#8211;&gt; 0.94<br \/>coefficient of restitution particle-wall&#8211;&gt; 0.7<br \/>Pipe &#8211;&gt; vertical<\/p>\n<p>I have some questions about modeling; could you please help me with them?<br \/>1. It is still unclear whether I should model it with the DPM option or the DDPM option because I have a small volume fraction. Still, on the other hand, according to the volume fraction, it should be analyzed as a two-way coupling (Elghobashi paper), so I should consider the collisions between particles and between particle-wall.<\/p>\n<p>2. Is it possible to input the pressure gradient and velocity into my solution, or should we just input one of those values?<\/p>\n<p>3. Using the DDPM option, Is it ok to put the coefficient of restitution of particle-particle as follows?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/09\/13-09-2022-1663091370-mceclip0.png\" width=\"573\" height=\"150\"><\/p>\n<p>2.- Using the DDPM option, how can I introduce the coef. of restitution of particle-wall?<\/p>\n<p>Thank you in advance for your answers.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-235166","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["262822","22555","199"],"_bbp_author_ip":["23.220.96.175"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2380"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["235166"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","262822"],"_bbp_voice_count":["3"],"_bbp_reply_count":["23"],"_bbp_last_reply_id":["236567"],"_bbp_last_active_id":["236567"],"_bbp_last_active_time":["2022-09-28 16:00:55"]},"test":"shankasis05gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/235166","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\/235166\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=235166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}