{"id":427156,"date":"2025-03-28T05:01:21","date_gmt":"2025-03-28T05:01:21","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/user-defined-scalaruds-for-nucleation-rate-in-crystallization\/"},"modified":"2025-03-28T05:01:21","modified_gmt":"2025-03-28T05:01:21","slug":"user-defined-scalaruds-for-nucleation-rate-in-crystallization","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/user-defined-scalaruds-for-nucleation-rate-in-crystallization\/","title":{"rendered":"User Defined Scalar(UDS) for Nucleation rate in Crystallization"},"content":{"rendered":"

<p>This is UDS which i am using to visualize nucleation rate in crystallization. Along with this UDS i am also using a UDF(it is running properly).<\/p><div>#include “udf.h”<\/div><div> <\/div><div>\/* Define UDS Source Term for Nucleation Rate *\/<\/div><div>DEFINE_SOURCE(nucleation_uds_source, cell, thread, dS, eqn)<\/div><div>{<\/div><div>    real J;<\/div><div>    <\/div><div>    \/* Retrieve the nucleation rate from UDM (assuming it’s stored in UDM[2] in your nucleation UDF) *\/<\/div><div>    J = C_UDMI(cell, thread, 2); <\/div><div>    <\/div><div>    \/* Store nucleation rate in UDS[0] for visualization *\/<\/div><div>    C_UDSI(cell, thread, 0) = J; <\/div><div>    <\/div><div>    \/* No derivative dependency *\/<\/div><div>    dS[eqn] = 0.0;<\/div><div>    <\/div><div>    return J;<\/div><div>}<\/div><div> <\/div><div>\/* Define Diffusive Flux for UDS *\/<\/div><div>DEFINE_UDS_FLUX(nucleation_uds_flux, f, thread, i)<\/div><div>{<\/div><div>    return 0.0; \/* No flux term, as we only visualize J *\/<\/div><div>}<\/div><p>And i am getting a floating point exception error , these are my errors while running simulation. Is there anything wrong in my uds?<br>Divergence detected in AMG solver: uds-0<br>Error at host: floating point exception<\/p><\/p>\n","protected":false},"template":"","class_list":["post-427156","topic","type-topic","status-publish","hentry"],"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