{"id":309281,"date":"2023-09-28T14:00:30","date_gmt":"2023-09-28T14:00:30","guid":{"rendered":"\/forum\/forums\/topic\/define-electrical-conductivity-issue\/"},"modified":"2023-09-28T14:00:30","modified_gmt":"2023-09-28T14:00:30","slug":"define-electrical-conductivity-issue","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/define-electrical-conductivity-issue\/","title":{"rendered":"Define electrical conductivity issue"},"content":{"rendered":"

Hi everyone,<\/p>\n

I’m using the MHD module to simulate the arc behaviour by ANSYS Fluent. Now, I want to define the electric conductivity of a material, which is a variable dependent on the electrical potential and current density, and I attempt to use UDF and expression to define the conductivity. However, the named expression function seems different to the expression of the material property dialogue, as the expression provided in the material property dialogue does not support such lots of variables in the named expression function. Additionally, I don’t know the location of the UDMs which reserve the current density and electrical potential, so I neither can’t use UDF to define the conductivity.<\/p>\n

Could you please let me know the method to check the location of the UDMs used by MHD module so I can call them in the UDF to define the conductivity via the macro like C_UDM? Or if the named expression can be used to define the property, it should be easier.<\/p>\n

Thanks!<\/p>\n","protected":false},"template":"","class_list":["post-309281","topic","type-topic","status-closed","hentry","topic-tag-udsudm","topic-tag-cfd-icfluent","topic-tag-mhd-1","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