tunif

FeBodyLoads.tunif(temp='', **kwargs)

Assigns a uniform temperature to all nodes.

Mechanical APDL Command: TUNIF

Parameters:

tempstr

Uniform temperature assigned to the nodes. If a TEMP value is not specified, the uniform temperature is set to zero.

Notes

tunif is a convenient form of the more general bfunif command.

In a transient or nonlinear thermal analysis, the uniform temperature is used during the first iteration of a solution as follows:

• as the starting nodal temperature, except where temperatures are explicitly specified ( d, dk )

• to evaluate temperature-dependent material properties.

In a structural analysis, the uniform temperature is used as the

default temperature for thermal strain calculations and material property evaluation, except where body load

temperatures are specified ( bf, bfe, bfk, ldread ). In other scalar field analyses, the uniform temperature is used for material property evaluation.

Because tunif (or bfunif,TEMP) is step-applied in the first iteration, issue a bf,ALL,TEMP, Value command to ramp on a uniform temperature load.

The command default sets the uniform temperature to the reference temperature defined via the tref command only (and not the mp,REFT command).

If using the command default to set the uniform temperature (to the reference temperature set via tref ), you can convert temperature-dependent secant coefficients of thermal expansion (SCTEs) from the definition temperature to the uniform temperature. To do so, issue the mpamod command.

In a mode-superposition harmonic or transient analysis, you must apply the load in the modal portion of the analysis. Mechanical APDL calculates a load vector and writes it to the MODE file, which you can apply via the lvscale command.

This command is also valid in PREP7.