Let us consider a change in the temperature of the entire body, independent of the coordinates. The initial temperature (ambient temperature) is $T_o~[^\circ\text{C}]$, the resulting temperature (working temperature) is $T_w~[^\circ\text{C}]$. The temperature difference can be prescribed in any load case.

In the name.i2 file, the temperature difference is assigned to the entire body:

where the meaning of $R_m$ is explained in Centrifugal force.

The following rules apply to prescribing the temperatures:

1. The temperature difference is always taken relative to the temperature $T_o$. If the initial temperature (ambient temperature) is not defined, the program substitutes $T_o=0~^\circ\text{C}$.
2. If, within a single load case, a change $T_o\rightarrow T_w$ is specified and, at the same time, a nonuniform temperature field is specified using a GV set, this temperature field takes precedence, and the temperature $T_w$ ceases to be defined. However, the temperature difference is still taken relative to $T_o$.
3. The material properties used to calculate the stiffness matrices are determined for the resulting temperature (working temperature) defined in the first load case. This temperature is either the default $0~^\circ\text{C}$, or $T_w$, or the temperature specified by a GV set.
4. If $T_o=T_w\ne0$ is specified, whether with or without a GV set, the temperature field is not taken into account for the calculation of stresses, but is written to the output file name.STR.