VOF Wave Zone Distance Model Reference

Table 1. VOF Wave Zone Distance Model Reference
Provided By	Not available as standalone option. Activated automatically when the VOF Waves model is activated.
Example Node Path	Continua > Physics 1 > Models > VOF Wave Zone Distance
Requires	Space: Three Dimensional Material: Multiphase Multiphase Model: Volume of Fluid (VOF) Optional Models: VOF Waves The VOF Wave Zone Distance model is activated automatically.
Properties	Key property is: VOF Wave Zone Distance Method. See VOF Wave Zone Distance Properties.
Activates	Solvers	VOF Wave Zone Distance See VOF Wave Zone Distance Solver Properties. PDE VOF Wave Zone Distance See PDE VOF Wave Zone Distance Solver Properties.
	Field Functions	See Field Functions.

VOF Wave Zone Distance Properties

VOF Wave Zone Distance Method

Sets the method that Simcenter STAR-CCM+ uses for computing the VOF wave zone distance.

The following options are available:

Implicit Tree

The default option. This method makes an exact projection calculation in real space, which is based on the triangulation of the surface mesh. The use of an implicit tree algorithm accelerates the calculation.
PDE

This method estimates the distance using a partial differential equation, the Poisson Equation.

VOF Wave Zone Distance Solver Properties

This solver controls the wave zone distance solution for the Implicit Tree wave zone distance method.

Solver Frozen

When On, the solver does not update any quantity during an iteration. It is Off by default. This is a debugging option that can result in non-recoverable errors and wrong solutions due to missing storage. See Finite Volume Solvers Reference for details.

Verbosity

Allows you to choose how much information Simcenter STAR-CCM+ reports in the Output window while the simulation is running. This property is useful for debugging problems when they occur. The only valid entries are 0 (default), 1, and 2:

0 = None: Leaves output at its default.
1 = Low: Displays CPU time statistics across cores for calculating the wall distance. It reports the mean, maximum, and minimum elapsed times in seconds.
2 = High: Displays CPU time statistics (see low verbosity) and memory usage statistics across cores. This entry allows you to evaluate the memory consumption of all server processes that are relevant to the wall distance calculation:
- max process peak—that is the maximum resident memory usage across cores.
- max host peak—that is the maximum memory that is used on a node.
- accumulated peak—that indicates the rough scalability in terms of required memory.

PDE VOF Wave Zone Distance Solver Properties

This solver controls the wave zone distance solution for the PDE wave zone distance method.

Maximum Iteration

Sets the maximum number of iterations the solver can use. The default is 10.

Solver Tolerance

Specifies the total relative solver residual. The default value is 0.01.

Under-Relaxation Factor

In order to promote convergence, this property is used to under-relax changes of the solution during the iterative process. If residuals show solution divergence and do not decrease, reduce the under-relaxation factor.

Verbosity

Allows you to choose how much information Simcenter STAR-CCM+ reports in the Output window while the simulation is running. This property is useful for debugging problems when they occur. The only valid entries are 0 (default) and 1:

0 = None: Leaves output at its default.
1 = Low: Displays convergence history for wall distance and CPU time information.

Reconstruction Frozen

When On, Simcenter STAR-CCM+ does not update reconstruction gradients with each iteration, but rather uses gradients from the last iteration in which they were updated. Activate Temporary Storage Retained in conjunction with this property. This property is Off by default.

Reconstruction Zeroed

When On, the solver sets reconstruction gradients to zero at the next iteration. This action means that face values used for upwinding (Eqn. (905)) and for computing cell gradients (Eqn. (917) and Eqn. (918)) become first-order estimates. This property is Off by default. If you turn this property Off after having it On, the solver recomputes the gradients on the next iteration.

Solver Frozen

When On, the solver does not update any quantity during an iteration. It is Off by default. This is a debugging option that can result in non-recoverable errors and wrong solutions due to missing storage. See Finite Volume Solvers Reference for details.

Temporary Storage Retained

When On, Simcenter STAR-CCM+ retains additional field data that the solver generates during an iteration. The particular data retained depends on the solver, and becomes available as field functions during subsequent iterations. Off by default.

Under-Relaxation Factor Ramp

The PDE Transition Boundary Distance > Under-Relaxation Factor Ramp node allows you to set and control a linear ramp for under-relaxation. For details, see Under-Relaxation Factor Ramp Reference.

AMG Linear Solver

The PDE Transition Boundary Distance > AMG Linear Solver node allows you to set the algebraic multigrid parameters for the PDE VOF Wave Zone Distance solver. For details, see Algebraic Multigrid and AMG Linear Solver Properties.

Field Functions

Damping Boundary Distance

The distance between a cell and the nearest damping boundary (that is, a boundary where the Damping option is activated).

See Wave Damping.

Damping Strength Indicator

This indicator field function can have values from [0,1] where 1 means maximal impact of damping and 0 means no impact.

This value is $r^{d}$ in Eqn. (336).

Forcing Boundary Distance

The distance between a cell and the nearest forcing boundary (that is, the boundary of the Forcing zone).

See Wave Forcing.

Forcing Strength Indicator

This indicator field function can have values from [0,1] where 1 means maximal impact of forcing and 0 means no impact.

This value is $r^{f}$ in Eqn. (339).