Specifying Varying Time Steps for Transient Solution Setups

For transient solution setups, you can specify varying time steps using the Advanced Time Variations dialog box.

Icepak transient Solve Setup dialox box General tab.

Icepak Linear time variation function.

Linear

Linear specifies a linear variation of the time step with time.

Icepak Linear time variation function.

where is the time, is the value of the variable at time , is the value of the variable at = 0, and is a constant.

Square Wave

Square Wave specifies a square wave profile for the time step variation. If the variation of time step required is regular/periodic with time, then this option can be used instead of the Piecewise Constant option.

Icepak Square Wave time variation function.

where is the value of the variable at time and is the value of the variable at = 0. is a function of time as shown in the following figure.

Icepak Square Wave time variation illustration.

The Phase is the time between = 0 and the first peak of the square wave. The On Time is the time that the square wave is at its peak value. The Off Time is the time between peak values of the square wave. The Off Value is the value of the square waves between the peaks of the wave. The peak value is the specified value of the transient quantity

Piecewise Constant

Piecewise constant specifies a piecewise constant variation of the time step, which uses a dataset of time/time-step pairs.

Icepak Piecewise Constant time variation function.

where is a function of time, is the value of the variable at time , is the value of the variable at = 0. See Using Datasets to Define Transient Parameters for information on defining using the Add Dataset dialog box.

Piecewise Linear

Icepak Piecewwise Linear time variation function.

where is a function of time, is the value of the variable at time , is the value of the variable at = 0. See Using Datasets to Define Transient Parameters for information on defining using the Add Dataset dialog box.