6.2.3 Hooking DEFINE_DIFFUSIVITY UDFs

After you have interpreted (Chapter  4) or compiled (Chapter  5) your DEFINE_DIFFUSIVITY UDF, the name of the function you supplied as a DEFINE macro argument will become visible and selectable in ANSYS FLUENT.

To hook the UDF to ANSYS FLUENT, first open the Materials task page.

Materials

Make a selection in the Materials list and click the Create/Edit... button to open the appropriate Create/Edit Materials dialog box (Figure  6.2.3).

Figure 6.2.3: The Create/Edit Materials Dialog Box

You then have the following options:

• To hook a mass diffusivity UDF for the species transport equations, select user-defined from the Mass Diffusivity drop-down list of the Create/Edit Materials dialog box (Figure  6.2.3). The User-Defined Functions dialog box (Figure  6.2.4) will open.

  Figure 6.2.4: The User-Defined Functions Dialog Box

  

  Select the name of your UDF (e.g., mean_age_diff::libudf) and click OK in the User-Defined Functions dialog box. The name will then be displayed in the field below the Mass Diffusivity drop-down list in the Create/Edit Materials dialog box. Click Change/Create to save your settings.

• To hook a single diffusion coefficient UDF so that it applies to all UDS equations, first set the number and options of the user-defined scalars using the User-Defined Scalars dialog box.

  Define $\rightarrow$ User-Defined $\rightarrow$ Scalars...

  Then, select user-defined from the UDS Diffusivity drop-down list in the Create/Edit Materials dialog box (Figure  6.2.5).

  Figure 6.2.5: The Create/Edit Materials Dialog Box

  

  Next, select the name of your UDF (e.g., mean_age_diff::libudf) in the User-Defined Functions dialog box that opens (Figure  6.2.4) and click OK. The name will then be displayed in the field below the UDS Diffusivity drop-down list in the Create/Edit Materials dialog box. Click Change/Create to save your settings.

See Section  2.3.3 for details about defining DEFINE_DIFFUSIVITY UDFs and the User's Guide for general information about UDS diffusivity.