To use the pressure-based solver, retain the default selection of
Pressure-Based under
Solver.
To use the density-based solver, select
Density-Based under
Solver.
After you have defined your model and specified which solver you want to use, you are ready to run the solver. The following steps outline a general procedure you can follow:
1.
(pressure-based solver only) Select the pressure-velocity coupling method (see Section
26.3.1).
2.
Choose the spatial discretization scheme and, for the pressure-based solver, the pressure interpolation scheme (see Section
26.2).
3.
(pressure-based solver only) Select the porous media velocity method
(see
Section
7.2.3).
4.
Select how you want the derivatives to be evaluated by choosing a gradient option
(see
this section in the separate
Theory Guide).
5.
Set the under-relaxation factors (see Section
26.3.2).
6.
(density-based explicit formulation only) Set up the FAS multigrid (see Section
26.4.4).
7.
Make any additional modifications to the solver settings that are suggested in the chapters or sections that describe the models you are using.
8.
Enable the appropriate solution monitors (see Section
26.13).
10.
Start calculating (see Section
26.11 for steady-state calculations, or Section
26.12 for time-dependent calculations).
11.
If you have convergence trouble, try one of the methods discussed in
Section
26.18.
The default settings for the first three items listed above are suitable for most problems and need not be changed. The following sections outline how these and other solution parameters can be changed, and when you may wish to change them.