{"id":247371,"date":"2023-01-24T16:29:37","date_gmt":"2023-01-24T16:29:37","guid":{"rendered":"\/forum\/forums\/topic\/error-in-computing-residence-time-with-p_time0-macro\/"},"modified":"2023-01-24T16:29:37","modified_gmt":"2023-01-24T16:29:37","slug":"error-in-computing-residence-time-with-p_time0-macro","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/error-in-computing-residence-time-with-p_time0-macro\/","title":{"rendered":"Error in computing Residence Time with P_TIME0 macro"},"content":{"rendered":"

Hello everyone,<\/p>\n

I would like to compute the residence time of blood in my CFD simulations (steady state). <\/p>\n

I know I can use the DPM model but I would like to have a spatial distribution of the residence time to do something like this in post-processing:<\/p>\n

<\/p>\n

I have read that I can use these macros: P_TIME0 and P_TIME, so I wrote a udf but when running my simulation at the first iteration I get abnormal exit which I think is due to the udf.<\/p>\n

This is my udf:<\/p>\n

<\/p>\n

I am not sure if I can use P_TIME0 and P_TIME in a define_execute_at_end function. I have tried to use define_dpm_source but I couldn’t understand how to return the values or save them in S. Also, I do not know if the pointer p to the particle is correctly used in my udf.<\/p>\n

Does anybody know how to solve this?<\/p>\n

Thank you!<\/p>\n","protected":false},"template":"","class_list":["post-247371","topic","type-topic","status-closed","hentry","topic-tag-dpm","topic-tag-fluent","topic-tag-particle-residence-time","topic-tag-particles","topic-tag-udf"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t