Step 2: General Settings

General

1.   Select the solver settings.

General

(a)   Select Density-Based from the Type list in the Solver group box.

  The density-based implicit solver is the solver of choice for compressible, transonic flows without significant regions of low-speed flow. In cases with significant low-speed flow regions, the pressure-based solver is preferred. Also, for transient cases with traveling shocks, the density-based explicit solver with explicit time stepping may be the most efficient.

(b)   Retain the default selection of Steady from the Time list.

Note:   You will solve for the steady flow through the nozzle initially. In later steps, you will use these initial results as a starting point for a transient calculation.

2.   For convenience, change the unit of measurement for pressure.

General Units...

  The pressure for this problem is specified in atm, which is not the default unit in ANSYS FLUENT. You will need to redefine the pressure unit as atm.

(a)   Select pressure in the Quantities selection list.

  Scroll down the list to find pressure.

(b)   Select atm in the Units selection list.

(c)   Close the Set Units dialog box.