Equation class settings enable you to control some aspects of the CFX-Solver on an equation class basis. For example, you can set:
A different time scale
A different advection scheme
A different transient scheme
Convergence control parameters for each class of equation
Criteria parameters for each class of equation
You might want to make such changes if you suspect that a convergence problem is caused by a particular equation class.
Select the equation class for which to specify settings.
The settings in this tab are a subset of those found on the Basic Settings tab (see Basic Settings: Common).
For details, see Timestep Selection in the CFX-Solver Modeling Guide and Advection Scheme Selection in the CFX-Solver Modeling Guide.
The settings you specify on this form will override those on the Basic Settings tab. Any equation classes that are unspecified will use the parameters set on the Basic Settings tab. The number and type of equation classes depends on the specific physics of the problem.
For details, see Controlling the Timescale for Each Equation in the CFX-Solver Modeling Guide.
Note: For a free surface simulation, you cannot set the advection scheme for the volume fraction (vf) equation class because the CFX-Solver uses a special compressive advection scheme.