Aeroacoustics Suppression Zone Boundary Distance Model

The Aeroacoustics Suppression Zone Boundary Distance model is selected automatically with the Aeroacoustics Suppression Zone model and calculates the distance from the centroid of a cell in the Acoustic Suppression Zone to the boundary using Acoustic Suppression.

This value is used in calculating the relaxation coefficient σ in Eqn. (4749), which governs the rate of damping.

Theory See Acoustic Suppression Zone Model.
Provided By [physics continuum] > Models > Acoustic Suppression Zone Boundary Distance Model
Example Node Path Continua > Physics 1 > Models > Acoustic Suppression Zone Boundary Distance
Requires Optional Models: Acoustic Suppression Zone

Acoustic Suppression Zone Boundary Distance is selected automatically.

Properties Key properties are: ASZ Boundary Distance Method. See Aeroacoustics Suppression Zone Boundary Distance Properties.
Activates Solvers ASZ Boundary Distance, PDE ASZ Boundary Distance. See Boundary Distance Solver Properties.
Field Functions Acoustic Suppression Zone Boundary Distance. See Aeroacoustics Suppression Zone Boundary Distance Field Function.

Aeroacoustics Suppression Zone Boundary Distance Properties

ASZ Boundary Distance Method
Sets the method used for computing the Aeroacoustics Suppression Zone boundary distance:
Implicit Tree
Calculates the exact distance using an implicit tree algorithm. This is the default.
PDE
Estimates the distance using a partial differential equation. See Eqn. (1655).

Boundary Distance Solver Properties

ASZ Boundary Distance Solver
This solver controls the Aeroacoustics Suppression Zone boundary distance solution for the Implicit Tree method in all the continua for which the model is activated.
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. 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 ASZ Boundary Distance Solver
This solver controls the Aeroacoustics Suppression Zone boundary distance solution for the PDE method in all the continua for which the model is activated.
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. The default is 1.0.
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.
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.
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.
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.
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. 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.

ASZ Boundary Distance Field Functions

Acoustic Suppression Zone Boundary Distance
The distance d from the centroid of a cell in the Acoustic Suppression Zone to the boundary using Acoustic Suppression. See Eqn. (4749).