{"id":346880,"date":"2024-01-28T06:55:10","date_gmt":"2024-01-28T06:55:10","guid":{"rendered":"\/forum\/forums\/topic\/how-to-vary-specific-heat-with-spatial-co-ordinates-not-with-temperature\/"},"modified":"2024-01-28T06:55:10","modified_gmt":"2024-01-28T06:55:10","slug":"how-to-vary-specific-heat-with-spatial-co-ordinates-not-with-temperature","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-vary-specific-heat-with-spatial-co-ordinates-not-with-temperature\/","title":{"rendered":"How to vary specific heat with spatial co-ordinates not with Temperature"},"content":{"rendered":"

I’m trying to write an UDF for the variaton of specific heat along the length of the micro-combustor.
I already wrote two UDFs to vary the thermal_conductivity and density along the length of micro-combustor and they worked well. I was even able to extract the graphs for them. The macro I used to write the the thermal_conductivity and density UDFs is DEFINE_PROPERTY. That is not working for the specific_heat. Later I tried another macro to vary the specific_heat that is DEFINE_SPECIFIC_HEAT. But this macro only takes T as input arguments not the cell and thread as the input arguments.<\/p>\n

DEFINE_PROPERTY(specific_heat,c,t)
{
   real x[ND_ND];
   real cp;
   C_CENTROID(x,c,t);
   cp=a*x[0]+e;
   return cp;
}<\/p>\n

DEFINE_SPECIFIC_HEAT(user_cp,c,t)
{
   real x[ND_ND];
   real cp;
   C_CENTROID(x,c,t);
   cp=a*x[0]+e;
   return cp;
}<\/p>\n

These are the codes I tried to vary the specific heat along the length of the micro-combustor but they didn’t work well.
Can you help me with this<\/p>\n","protected":false},"template":"","class_list":["post-346880","topic","type-topic","status-closed","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