{"id":221481,"date":"2022-07-27T14:56:28","date_gmt":"2022-07-27T14:56:28","guid":{"rendered":"\/forum\/forums\/topic\/finding-a-cell-closest-to-a-point-in-domain-in-parallel-mode\/"},"modified":"2022-07-27T15:00:35","modified_gmt":"2022-07-27T15:00:35","slug":"finding-a-cell-closest-to-a-point-in-domain-in-parallel-mode","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/finding-a-cell-closest-to-a-point-in-domain-in-parallel-mode\/","title":{"rendered":"finding a cell closest to a point in domain (in parallel mode)"},"content":{"rendered":"<p>Hello,<\/p>\n<p>I&#8217;ve been using this code to read the velocity of flow from a cell thats closest to the point &#8220;x&#8221; in serial mode:<\/p>\n<pre><span style=\"font-size: 12pt\">DEFINE_ADJUST(name,dom) {<\/span><br><br><span style=\"font-size: 12pt\">real c[3], Vx, d =1, d_new ;<\/span><br><br><span style=\"font-size: 12pt\">real x[3] = {1,2,3} ;      \/*just an example*\/<\/span><br><br><span style=\"font-size: 12pt\">Thread *c_thread ;<\/span><br><br><span style=\"font-size: 12pt\">cell_t cell ;<\/span><br><br><br><br><span style=\"font-size: 12pt\">thread_loop_c(c_thread, dom)<\/span><br><br><span style=\"font-size: 12pt\">{<\/span><br><br><span style=\"font-size: 12pt\"> &nbsp; &nbsp; begin_c_loop(cell,c_thread)<\/span><br><br><span style=\"font-size: 12pt\">&nbsp; &nbsp; &nbsp; {<\/span><br><br><span style=\"font-size: 12pt\">          C_CENTROID(c,cell,c_thread) ;<\/span><br><br><span style=\"font-size: 12pt\"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;d_new = sqrt(pow(c[0]-x[0],2)+pow(c[1]-x[1],2)+pow(c[2]-x[2],2)) ;<\/span><br><br><span style=\"font-size: 12pt\">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (d_new &lt; d )<\/span><br><br><span style=\"font-size: 12pt\">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;{<\/span><br><br><span style=\"font-size: 12pt\">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; d = d_new ;<\/span><br><br><span style=\"font-size: 12pt\"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Vx = C_U(cell,c_thread) ;<\/span><br><br><span style=\"font-size: 12pt\">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<\/span><br><br><span style=\"font-size: 12pt\"> &nbsp; &nbsp; &nbsp; } end_c_loop_int(cell,c_thread)<\/span><br><br><span style=\"font-size: 12pt\">}<\/span><br><br><span style=\"font-size: 12pt\">}<\/span><\/pre>\n<p>But on a parallel session, every node loops over its own partition of the domain and this algorithm wil find the closest cell on each node locally. Unfortunately I&#8217;m struggling to make it work in parallel mode and appreciate any help on how to do it.<\/p>\n","protected":false},"template":"","class_list":["post-221481","topic","type-topic","status-closed","hentry","topic-tag-parallelization","topic-tag-udf-fluent"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,I&#039;ve been using this code to read the velocity of flow from a cell thats closest to the point &quot;x&quot; in serial mode:DEFINE_ADJUST(name,dom) {real c[3], Vx, d =1, d_new ;real x[3] = {1,2,3} ; \/*just an example*\/Thread *c_thread ;cell_t cell ;thread_loop_c(c_thread, dom){ begin_c_loop(cell,c_thread) { C_CENTROID(c,cell,c_thread) ; d_new\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/finding-a-cell-closest-to-a-point-in-domain-in-parallel-mode\/\" \/>\n\t<meta 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