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AcuSolve Command Reference Manual
AcuSolve command descriptions and corresponding examples.
Element Data Commands
The Element Data commands are outlined in this chapter.
FWH_OUTPUT
Specifies output parameters for the Ffowcs-Williams Hawkings (FWH) method that is used by the AcuFwh post processing program to propagate acoustic sources to far field locations.

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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.
- 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.
  - BATTERY_COMPONENT_MODEL
    Specifies a battery component model and its parameters.
  - BATTERY_MODULE
    Specifies a battery module and its parameters.
  - BATTERY_PACK
    Specifies a battery pack and its parameters.
  - BATTERY_THERMAL_RUNAWAY_MODEL
    Specifies a thermal runaway model and its parameters.
  - CAA_ELEMENT_OUTPUT
    Specifies a set of elements for CAA integrated-element output.
  - CAA_OUTPUT
    Specifies output parameters for Computational Aero-Acoustics (CAA) post-processing.
  - CAA_SURFACE_OUTPUT
    Specifies a set of surfaces for CAA integrated-surface output.
  - ELEMENT_BOUNDARY_CONDITION
    Specifies an element boundary condition for a solution field on a set of element faces.
  - ELEMENT_OUTPUT
    Specifies output parameters for a set of elements.
  - ELEMENT_SET
    Specifies a set of elements.
  - EXTERNAL_CODE_SURFACE
    Specifies a fluid surface that interacts with a solid/structural surface from an external code.
  - FAN_COMPONENT
    Specifies a fan component for an element set.
  - FEEDBACK_CONDITION
    Specifies a feedback condition and its parameters.
  - FIELD_BOUNDARY_CONDITION
    Specifies field element and nodal boundary conditions on a set of element faces referred to in SIMPLE_BOUNDARY_CONDITION.
  - FREE_SURFACE
    Specifies a free surface.
  - FWH_SURFACE_OUTPUT
    Specifies a set of surfaces for integrated-surface output parameters for the Ffowcs-Williams Hawkings (FWH) method that is used by the AcuFwh post processing program to propagate acoustic sources to far field locations.
  - FWH_OUTPUT
    Specifies output parameters for the Ffowcs-Williams Hawkings (FWH) method that is used by the AcuFwh post processing program to propagate acoustic sources to far field locations.
  - GUIDE_SURFACE
    Specifies a surface for mesh nodes to follow.
  - HEAT_EXCHANGER_COMPONENT
    Specifies a heat exchanger component for an element set.
  - INTERFACE_SURFACE
    Specifies an interface surface for a non-conformal mesh.
  - INTERPOLATED_MOTION_SURFACE
    Specifies a surface that is used to scale displacements of mesh nodes.
  - LINE_SOURCE
    Specifies sources on a line.
  - MESH_BOUNDARY_CONDITION
    Specifies element and nodal boundary conditions for mesh displacement for a set of element faces.
  - PARTICLE_SURFACE
    Specifies a surface for particle tracking.
  - RADIATION_SURFACE
    Specifies radiative boundary conditions for the enclosure, p1_model and discrete_ordinate radiation models.
  - SIMPLE_BOUNDARY_CONDITION
    Specifies element and nodal boundary conditions on a set of element faces.
  - SOLAR_RADIATION_SURFACE
    Specifies a solar radiation heat flux condition on a surface.
  - SURFACE_INTEGRATED_CONDITION
    Specifies a condition on the surface integral of a solution variable.
  - SURFACE_OUTPUT
    Specifies output parameters for a boundary surface.
  - SURFACE_SET
    Specifies topological information for a set of surface elements.
  - TURBULENCE_WALL
    Specifies a turbulent boundary layer wall.
  - VAO_ELEMENT_OUTPUT
    Specifies a set of elements for vibro-acoustics integrated-element output.
  - VAO_OUTPUT
    Specifies output parameters for vibro-acoustics output.
  - VAO_SURFACE_OUTPUT
    Specifies a set of surfaces for integrated-surface output parameters for vibro-acoustics.
  - VOLUME_SET
    Specifies topological information for a set of volumetric elements.
- 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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FWH_OUTPUT

Specifies output parameters for the Ffowcs-Williams Hawkings (FWH) method that is used by the AcuFwh post processing program to propagate acoustic sources to far field locations.

Type

AcuSolve Command

Syntax

FWH_OUTPUT{parameters...}

Qualifier

None.

Parameters

reference_density or ref_dens (real) [=1.225]: Reference density. Required to compute the output quantities.
reference_pressure or ref_pres (real) [=0]: Reference pressure. Required to compute the output quantities.
reference_sound_speed or sound (real) [=330]: Reference sound speed. Required to compute the output quantities.
source_output_frequency or out_freq (integer) >=0 [=0]: Time step frequency at which to output FWH data. If zero, this option is ignored.
source_output_time_interval or out_intv (real) >=0 [=0]: Time frequency at which to output the FWH data. If zero, this option is ignored.
num_saved_states or save (integer) >=0 [=0]: Number of FWH data files to keep. If zero, all are kept.

Description

This command specifies the FWH output data properties to support Ffowcs-Williams Hawkings (FWH) post-processing. For example,

FWH_OUTPUT{
 reference_density           = 1.225
 reference_pressure          = 0
 reference_sound_speed       = 330
 source_output_frequency     = 1
 source_output_time_interval = 0
 num_saved_states            = 0
}

The parameters reference_density, reference_pressure and reference_sound_speed provide the required data for the computation of the output fields. An AcuSolve input file should only contain one FWH_OUTPUT command.