{"id":161814,"date":"2023-01-25T07:17:01","date_gmt":"2023-01-25T07:17:01","guid":{"rendered":"\/knowledge\/forums\/topic\/in-steady-state-the-number-of-dpm-particles-in-a-stream-can-be-measured-using-strength-ie-mp_dot-is-the-mass-source-to-the-continuous-phase-difference-in-mass-between-entry-and-exit-f\/"},"modified":"2023-07-31T12:35:56","modified_gmt":"2023-07-31T12:35:56","slug":"in-steady-state-the-number-of-dpm-particles-in-a-stream-can-be-measured-using-strength-ie-mp_dot-is-the-mass-source-to-the-continuous-phase-difference-in-mass-between-entry-and-exit-f","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-steady-state-the-number-of-dpm-particles-in-a-stream-can-be-measured-using-strength-ie-mp_dot-is-the-mass-source-to-the-continuous-phase-difference-in-mass-between-entry-and-exit-f\/","title":{"rendered":"In steady state, the number of dpm particles in a stream can be measured using  &#8216;strength&#8217;, ie:  \/* mp_dot is the mass source to the continuous phase     * (Difference in mass between entry and exit from cell)     * multiplied by strength (Number of particles\/s in stream)     *\/    mp_dot = (TP_MASS0(tp) &#8211; TP_MASS(tp)) * strength;  What is the usage for transient DPM?"},"content":{"rendered":"<p>The parameter &#8220;strength&#8221; is passed into DEFINE_DPM_SOURCE UDFs.  In transient it is the number of particles in a parcel, divided by the solver flow time step. It is used to scale the source term of a single &#8220;reference&#8221; particle to provide the right source term for all the particles of this parcel.  The is designed parameter in such a way that you can use the same UDF for transient and steady simulations without the need to distinguish.<\/p>\n","protected":false},"template":"","class_list":["post-161814","topic","type-topic","status-publish","hentry","topic-tag-19-2","topic-tag-fluent","topic-tag-fluid-dynamics","topic-tag-mp-particle-tracking","topic-tag-multiphase","topic-tag-scripting-journaling-udf"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_forum_id":["27809"],"_bbp_author_ip":["23.56.168.180"],"_bbp_last_active_time":["1-24-2023  20:20:14"],"_btv_view_count":["867"],"siebel_km_number":["2057275"],"product_version":["19.2"],"km_published_date":["2018-11-28T20:05:51.000Z"],"family":["Fluid Dynamics"],"application_name":["FLUENT"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161814","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161814\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=161814"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}