Mass Error Rate Model Reference

The Mass Error Rate model triggers the creation of the Relative Mass Error Rate field function. You can use this field function to create a stopping criterion for inner iterations.

You activate the Mass Error Rate model to obtain information about the VOF phase mass conservation per time-step. Numerical mass conservation is related to the convergence of the inner iterations per time-step. If the inner iterations are well converged within a time-step, mass is conserved. However, if convergence of the inner iterations is not fulfilled for the time-step, mass might not be conserved and a mass error occurs.

See Setting Up Automatic Inner Iterations.

The relative mass error is computed as:
Figure 1. EQUATION_DISPLAY
ϵ=|mImbalancemtot⋅100|
(317)

where mImbalance is the sum of phase mass imbalance in the entire computational domain and mtot is the total phase mass. The mass imbalance is computed when solving the transport equations. For more information, see General Transport Equation.

Table 1. Mass Error Rate Model Reference
Provided By [phase] > Models > Optional Models
Example Node Path [phase] > Models > Mass Error Rate
Requires

A VOF Multiphase simulation.

A Eulerian phase.

In the Phase Model Selection dialog:

  • Optional Models: Mass Error Rate
Properties None.
Activates Field Functions Relative Mass Error Rate of [Phase]

See Field Functions.

Field Functions

Relative Mass Error Rate of [Phase]
The relative mass error rate of the phase as given by Eqn. (317).