3.3.2 Source Term UDF Setup

If you answered no to presetting all fiber model-specific UDF hooks during the loading process (Section  3.2) then you will need to set source terms, individually, for each fluid zone in your model. Alternatively, you can leave the default settings ( none for no source term).

For each fluid zone in your model, specify none, constant, or UDF for all of the source terms by following the procedure below:

Cell Zone Conditions

1.   In the Cell Zone Conditions task page, select a fluid zone under Zone and click editt.... This will open the Fluid dialog box.

2.   In the Fluid dialog box, check Source Terms and click on the Source Terms tab.

3.   For each of the source terms in the scroll list ( Mass, X Momentum, etc.), click the Edit... button next to each source term to open the corresponding source dialog box. Leave the default none, or choose constant or UDF from the drop-down list. Choose the UDF in the drop-down list that corresponds to the particular source term. For example, udf fm_src_mass corresponds to the Mass source term. Use the table below (Table  3.3.1) as a reference guide.

4.   Click OK when all of the UDFs have been hooked.

Table 3.3.1: Source Terms and Corresponding UDFs

Mass	udf fm_src_mass
X Momentum or Axial Momentum	udf fm_src_x_mom
Y Momentum or Radial Momentum	udf fm_src_y_mom
Z Momentum	udf fm_src_z_mom
Energy	udf fm_src_enthalpy
discrete ordinates model	udf fm_src_dom

5.   Repeat this process for the remaining fluid zones in your ANSYS FLUENT model.

If you want to include radiative interaction of the fibers with the discrete ordinate (DO) radiation model, then the appropriate source term UDF ( udf fm_src_dom) will be hooked automatically when you select Fiber Radiation Interaction in the Fiber Model dialog box. You must initialize the solution (which will allocate memory for the DO model) before the fiber model will be ready to accept the fiber radiation interaction data.