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ANSYS FLUENT – Multiphase (VOF Model) – Water & Glycerin

Source: ANSYS FLUENT

Instructions for specifying the necessary information for the primary and secondary phases and their interaction in a VOF calculation are provided below.

  In general, you can specify the primary and secondary phases whichever way you prefer. It is a good idea, especially in more complicated problems, to consider how your choice will affect the ease of problem setup. For example, if you are planning to patch an initial volume fraction of 1 for one phase in a portion of the domain, it may be more convenient to make that phase a secondary phase. Also, if one of the phases is a compressible ideal gas, it is recommended that you specify it as the primary phase to improve solution stability.
   Recall that only one of the phases can be a compressible ideal gas. Be sure that you do not select a compressible ideal gas material (i.e., a material that uses the compressible ideal gas law for density) for more than one of the phases. 

Defining the Primary Phase


To define the primary phase in a VOF calculation, perform the following steps:1.   Select phase-1 in the Phases list.2.   Click Edit… to open the Primary Phase dialog box (Figure  24.3.5) .

3.   In the Primary Phase dialog box, enter a Name for the phase.

4.   Specify which material the phase contains by choosing the appropriate material in the Phase Material drop-down list.

5.   Define the material properties for the Phase Material.(a)   Click Edit…, and the Edit Material dialog box will open.(b)   In the Edit Material dialog box, check the properties, and modify them if necessary.

   If you make changes to the properties, remember to click Change before closing the Edit Material dialog box.

6.   Click OK in the Primary Phase dialog box.

Defining a Secondary Phase


To define a secondary phase in a VOF calculation, perform the following steps:1.   Select the phase (e.g., phase-2) in the Phases list.2.   Click Edit… to open the Secondary Phase dialog box (Figure  24.3.6) .

3.   In the Secondary Phase dialog box, enter a Name for the phase.4.   Specify which material the phase contains by choosing the appropriate material in the Phase Material drop-down list.5.   Define the material properties for the Phase Material, following the procedure outlined above for setting the material properties for the primary phase.6.   Click OK in the Secondary Phase dialog box.

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