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AcuSolve Command Reference Manual
AcuSolve command descriptions and corresponding examples.
Global Commands
This section contains the commands that define the global description of a problem or provide data that can be used globally.
WAVE_DAMPING_SOURCE
Specifies a volumetric momentum source term to damp surface waves.

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AcuSolve Training Manual
Introduction of background knowledge regarding flow physics and CFD as well as detailed information about the use of AcuSolve and what specific options do.
AcuSolve Validation Manual
Collection of AcuSolve simulation cases for which results are compared against analytical or experimental results to demonstrate the accuracy of AcuSolve results.
AcuSolve Command Reference Manual
AcuSolve command descriptions and corresponding examples.
- Command Format
  The commands have the following general syntax.
- Command Qualifier
  Some commands require a qualifier. The qualifier is used to distinguish one use of the command from another.
- Parameter Format
  Each command may have zero or more parameters. Most command parameters have default values.
- Parameter Operators and Functions
  Parameter types of integer, real, and array may be any valid arithmetic expression. Valid expressions consist of the operators +, -, *, /, ^ (for power), parentheses, a set of built-in functions and a set of built-in or user-assigned variables, specified by the ASSIGN command.
- File and Data Format/Reading Data From Files
  AcuSolve input file supports two mechanisms for entering list and array data.
- Alternative Command Organization
  In the rest of this manual the commands are grouped into general categories and placed into chapters. In order to make a particular command functionality easier to find, an alternative categorization is presented. Each command may appear in more than one category.
- Global Commands
  This section contains the commands that define the global description of a problem or provide data that can be used globally.
  - ANALYSIS
    Specifies global analysis data.
  - CONSTRAINT
    Specifies the constraints based on responses.
  - DESIGN VARIABLE
    Specifies design optimization variables.
  - DESIGN VARIABLES FIELD
    Specifies design optimization variables field for topology optimization.
  - EQUATION
    Specifies equation systems present in the problem.
  - EXTERNAL_CODE
    Specifies communication parameters for coupling with an external solid/structural code.
  - FIELD_BOUNDARY_CONDITION
    Specifies field quantity for boundary conditions.
  - FLEXIBLE_BODY
    Specifies a solid body for fluid-structure interaction.
  - IMMERSED_BOUNDARY_SURFACE
    This command has an option of including floating surfaces from which to write output data.
  - MESH_MOTION
    Specifies mesh motion of nodes.
  - MULTIPLIER_FUNCTION
    Specifies a scalar multiplier function to scale values of other commands and parameters at run time.
  - NODAL SHAPES
    Specifies the morph shapes and associated design optimization variables.
  - OBJECTIVE
    Specifies the objective for an optimization problem.
  - OPTIMIZATION
    Specifies optimization is activated.
  - PARTICLE_TRACE
    Specifies communication parameters for coupling with AcuTrace.
  - RADIATION
    Specifies global radiation algorithms and parameters.
  - REFERENCE_FRAME
    Specifies a reference frame for element sets and boundary conditions.
  - RESPONSE VARIABLE
    Specifies the responses to be used for optimization.
  - SOLAR_RADIATION
    Specifies global solar radiation algorithms and parameters.
  - THERMAL_SHELL
    Creates shell elements from surface elements for temperature field only.
  - TURBULENCE_MODEL_PARAMETERS
    Specifies constants and parameters for turbulence models.
  - USER_GLOBAL_DATA
    Defines and initializes globally-accessible data.
  - WAVE_BOUNDARY_CONDITION
    Specifies a wave generator boundary condition.
  - WAVE_DAMPING_SOURCE
    Specifies a volumetric momentum source term to damp surface waves.
- Solution Strategy Commands
  The solution strategy of a problem is specified by the commands in this section.
- Body Force Commands
  The Body Force commands are described in this chapter. These commands add volumetric source terms to the governing conservation equations.
- Material Model Commands
  The Material Model commands are described in this chapter.
- Nodal Data Commands
  The Nodal Data commands are outlined in this chapter.
- Element Data Commands
  The Element Data commands are outlined in this chapter.
- Functional Commands
  The Functional commands, except for AUTO_SOLUTION_STRATEGY, are outlined in this chapter.
AcuSolve Programs Reference Manual
AcuSolve utility programs covering preparatory and post-processing as well as user-defined functions and utility scripts.
AcuSolve User-Defined Functions Manual
Customization of AcuSolve allowing you to customize certain capabilities of the solver.
AcuTrace Command Reference Manual
Commands of AcuTrace, a particle tracer that runs as a post-processor to or a co-processor with AcuSolve.
AcuTrace User-Defined Functions Manual
Instructions to define additional solution quantities of AcuTrace called user equations.
AcuReport Reference Manual
Instruction of the AcuReport tool, a standalone post-processor batch tool used to generate a report from an AcuSolve solution database.
AcuSolve Surface Processing

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WAVE_DAMPING_SOURCE

Specifies a volumetric momentum source term to damp surface waves.

Type

AcuSolve Command

Syntax

WAVE_DAMPING_SOURCE {parameters...}

Qualifier

This command has no qualifier.

Parameters

wave_damping_type (enumerated) (=none)

Type of wave damping to be applied. If none, no damping is applied.

none: No damping.
linear: Linear damping model is applied.

wave_damping_distance or dist real (=0): Distance from the outlet surface where the damping source term is active.

wave_damping_coefficient or coef real (=10): Coefficient multiplying the damping source term.

Description

This command is used to damp a surface wave in a multiphase flow problem by adding momentum source per unit volume to the momentum equation along the direction of gravity. The momentum source per unit volume term takes the following form:

S (x) = - C ρ | U_{z} | {(\frac{x - x_{O}}{x_{D}})}^{2}

where C is the wave damping coefficient, $ρ$ is the density, $U_{Z}$ is the velocity component along gravity, x is the local coordinate where the source term is being applied, $x_{D}$ and $x_{0}$ are the wave damping distance and the coordinate of the outlet surfaces, respectively.

Wave damping with a linear model can be specified as follows:

WAVE_DAMPING_SOURCE {
    wave_damping_type	         = linear
    wave_damping_distance	 = 5
    wave_damping_coefficient     = 10
}

Optionally, the outlet surface can be excluded from the damping zone calculation by setting the boolean wave_damping to "off" within the SIMPLE_BOUNDARY_CONDITION command.