Setting Boundary Conditions

This section or topic is specific to Console Mode.

Boundary conditions are conditions that define how matter behaves at the boundaries of your system. By default, matter is not allowed to cross the system boundaries.

You can change the setting for both the lower boundary (left side/centre) and the upper boundary (right side/surface) of the system.

  1. Complete Defining a System in Console Mode and Creating Regions and Gridpoints.
  2. Use SET_CONDITION and choose Boundary. Then specify whether you want to set the LOWER or the UPPER boundary. 
  3. Specify which condition type you want to set the boundary to.
  4. Enter any parameter values that are necessary for the condition type you have chosen.
  5. Specify the LOW TIME LIMIT, when the function you define starts to apply.
  6. If required, enter the function that is applied during the time interval. For most condition types, the function may have time, temperature and pressure as arguments.
  7. Enter the HIGH TIME LIMIT for the interval.
  8. If you want to define a different function for another time interval, then enter Y when prompted with ANY MORE RANGES.  Then enter another function for the next range.
  9. When you have defined functions for all the ranges you want, enter N at the ANY MORE RANGES prompt.