Testing the view factor quality

This test is based on the maximum temperature in the furnace, e.g. 1500 K. No heaters should be defined.

  1. If heaters are defined, you have to delete them first or set existing heaters to a fixed power of 0 Watt.:

    Select Settings > Heaters to open the Heaters dialog.

  2. Delete one heater after the other by selecting it and clicking on delete heater.

    or

    Set the power of all heaters to a fixed power of 0 Watt.

  3. Click on Apply and Close.

    or

    Click on OK to apply the changes and to close the dialog.

  4. Select all furnace boundary lines by pressing and holding the CTRL key and clicking the middle mouse button.

  5. Select Settings > Boundaries.

  6. Select variable Temperature.

  7. Check the Dirichlet boundary check box.

  8. Type 1500 (respectively the maximum temperature in the furnace) in the Value input field.

  9. Click on Apply and Close.

    or

    Click on OK to apply the changes and to close the dialog.

  10. Select Computation > Start Computation.

    or

    Click on   in the tool bar.

    You can follow the computation of the view factors, if not yet done and the solving process for the variable Temperature in the right corner of the status bar and in the terminal window.

  11. In theory, the temperature field should be uniformly at 1500 K. In practice there will be some deviations from this temperature. The minimum and maximum values for temperature can be examined by checking the isolines:

    Select Visualization > Options for Scalar fields to examine.

If the deviation between minimum and maximum value is 10 K or less, the view factors are good.