Specifying settings and parameters for computing concentration

Temperature and flow field for this CVD reactor have already been computed.

  1. Select File > Open.

  2. Open file Concentration.crys.

    The simplified CVD reactor will be displayed.

    CVD reactor for species transport 

    Figure 89. CVD reactor for species transport

  3. Select Settings > Physical Phenomena.

  4. Activate Concentration by clicking on the box in the Yes column.

  5. Click on Apply and Close.

  6. Select Settings > Boundaries.

  7. Boundaries for temperature and velocity must also be specified for computing concentration. In this tutorial the Dirichlet boundaries for temperature and the velocity boundaries for inflow and outflow at the vertical lines as well as boundaries for the remaining border lines have already been specified. You can look at them by selecting the respective variable and clicking on show in the Boundaries dialog.

    But you do have to set the boundaries for concentration.

    Select Concentration from the variable list box.

  8. Select the inclined line in the middle of the reactor by pressing the middle mouse button.

  9. Select the Poincaré boundary condition.

  10. Type the reference value 0 and the coefficient 5*x in the respective fields.

  11. Click on Apply.

  12. Select the left vertical line (inflow) by pressing the middle mouse button.

  13. Select the Dirichlet boundary condition.

  14. Type 1 into the Value field.

  15. Click on Apply and Close.

  16. Select the variable group Concentration from the list box in the tool bar. Since you did not compute convection this far, only the diffusive filed will be computed.

  17. Click on the Start computation button  .

  18. You can visualize the results by clicking the buttons for showing isolines and scalar field.

    Click on the Show/hide isolines button   and the Show/hide scalar field button  .

    The isolines and the scalar field for the Concentration are displayed.

    Scalar field and isolines for the species concentration for the diffusive transport 

    Figure 90. Scalar field and isolines for the species concentration for the diffusive transport

    You can as well visualize the scalar field and the isolines for the temperature by selecting the variable in the list box.

    Temperature isolines 

    Figure 91. Temperature isolines

  19. Select the variable group Convection from the list box in the tool bar. Compute the convection, and afterwards compute the concentration as described above. You can visualize the results like you did before, this time you will recognize that the results look different.

  20. Scalar field and isolines for the species concentration for the convective transport 

    Figure 92. Scalar field and isolines for the species concentration for the convective transport

Related Dialogs

Boundaries

Species

Related Procedures

Setting parameters for species transport simulation.