Defining boundaries

In time-dependent computation boundaries can have different values at different time steps. CrysMAS reads the temperature values from a profile file which has the following structure:

col 1 (time)

col 2 (point 1)

col 3 (point 2)

col 4 (point 3)

3

0.2

0.5

0.7

0

300

350

370

5

320

350

350

8

350

350

330

The 1st line contains the number of points given at the line, and their relative position along the line. The following lines contain the time and the values at that time for the different points. The first line must be in the file, even though you do not need any points along the line. In this case set one point having the position 0.

The boundary values between the time steps will be automatically calculated by interpolation.

Tip

If you do not know the coordinates of the start point, you can find them using the writing profile utility, see Monitor/Write Profile.

  1. Select Settings > Boundaries.

    The Boundaries dialog opens.

    Boundaries dialog 

    Figure 47. Boundaries dialog

  2. Move the mouse pointer to the line furthest right in the drawing and press the middle mouse button to select the line.

    The line will be highlighted in the drawing and the dialog window indicates: 1 line(s) selected.

  3. Click on the box next to Dirichlet in the field Type.

    The input field for parameters becomes active, but you are not going to enter a value, because you want to use a profile file.

  4. Click on Profile option.

    Now you can specify the profile file and the column where CrysMAS finds the boundary condition.

  5. Browse for the file Profile1.pro to be found in CrysMAS 's DATA directory and select it.

    Boundaries dialog, profile file 

    Figure 48. Boundaries dialog, profile file

    The file name will appear in the file name field of the Boundaries dialog window.

  6. Set the column value to 2.

  7. Click on Apply and Close.

Related Procedures

Boundary Conditions

Related Dialogs

Boundaries