[cfd_Matrix]

hi everyone,

i have to write UDF (unsteady model) for non-reversible changes in material density with temperature using DEFIN_PROPERTIES :

If T< Tcr (critical temperature), rho = 5.0 Kg/m3
else

If T>= Tcr , rho = 20 Kg/m3 and it keep this values even if the temperatures return below Tcr.

Thanks in advance