[amrkaood]

Dears,
How can identify the viscosity as a function of temperature in FLUENT?
By UDF or Expression

[rupak504]

use DEFINE PROPERTY macro in UDF, you can find examples online.

[amrkaood]

Unfortunately, i didn't work on a code before.
But, already i check on internet and i found this code. But, i can't modify it.
UDF that simulates solidification by specifying a temperature- dependent viscosity property ************************************************** ********************/ DEFINE_PROPERTY(cell_viscosity, c, t) { real mu_lam; real temp = C_T(c, t); if (temp > 288.) mu_lam = 5.5e-3; else if (temp > 286.) mu_lam = 143.2135 - 0.49725 * temp; else mu_lam = 1.; return mu_lam; }

[rupak504]

Originally Posted by amrkaood

Unfortunately, i didn't work on a code before.
But, already i check on internet and i found this code. But, i can't modify it.
UDF that simulates solidification by specifying a temperature- dependent viscosity property ************************************************** ********************/ DEFINE_PROPERTY(cell_viscosity, c, t) { real mu_lam; real temp = C_T(c, t); if (temp > 288.) mu_lam = 5.5e-3; else if (temp > 286.) mu_lam = 143.2135 - 0.49725 * temp; else mu_lam = 1.; return mu_lam; }

DEFINE_PROPERTY(cell_viscosity, c, t) { real mu_lam; real temp = C_T(c, t); mu_lam = (your expression as a function of temp); return mu_lam; }

compile this, then in materials, you can find mu_lam under viscosity tab of the selected material