AcousticRadiationValue
✖
AcousticRadiationValue
represents a time or frequency radiation boundary condition for PDEs with predicate pred indicating where it applies, with model variables vars and global parameters pars.
represents a time or frequency domain boundary condition with local parameters specified in pars[lkey].
Details




- AcousticRadiationValue specifies a boundary condition for AcousticPDEComponent and is used as part of the modeling equation:
- AcousticRadiationValue is typically used to model sound sources and sinks on the boundary.
- AcousticRadiationValue models a time or frequency domain boundary source or sink with dependent variable pressure
in
, independent variables
in
and time variable
in
or frequency variable
in
.
- Time-dependent model variables vars are vars={p[t,x1,…,xn],t,{x1,…,xn}}.
- Frequency-dependent model variables vars are vars={p[x1,…,xn],ω,{x1,…,xn}}.
- The time domain acoustics model AcousticPDEComponent is based on a wave equation with time variable
, density
, sound speed
and sound sources
and
:
- The frequency domain acoustics model AcousticPDEComponent is based on a Helmholtz equation with angular frequency
:
- The time domain radiation value AcousticRadiationValue with boundary pressure source
, boundary unit normal vector
and unit wave direction vector
models:
- The frequency domain radiation value AcousticRadiationValue models:
- The dipole source
will only be valid within the domain and thus can be excluded from the boundary conditions.
- Model parameters pars are specified as for AcousticPDEComponent.
- The following model parameters pars can be given:
-
parameter default symbol "BoundaryUnitNormal" Automatic "MassDensity" 1 , density of media in
"Material" Automatic "SoundSpeed" 1 , speed of sound in
"SoundDirectionVector" , sound direction vector
"SoundIncidentPressure" 0 , sound pressure in
- The relation between the outward-pointing boundary unit normal vector
and the incident sound wave direction vector
is illustrated in the following:
- AcousticRadiationValue combines an AcousticPressureCondition and an AcousticAbsorbingValue.
- AcousticRadiationValue evaluates to a generalized NeumannValue.
- The boundary predicate pred can be specified as in NeumannValue.
- An absorbing boundary can be used with:
-
analysis type applicable Time Domain Yes Frequency Domain Yes Eigenfrequency No - If the AcousticRadiationValue depends on parameters
that are specified in the association pars as …,keypi…,pivi,…], the parameters
are replaced with
.







Examples
open allclose allBasic Examples (4)Summary of the most common use cases
Set up a time domain acoustic radiation boundary:

https://wolfram.com/xid/0mfdtx00jbphniksai-vw7olo

Set up a frequency domain acoustic radiation boundary:

https://wolfram.com/xid/0mfdtx00jbphniksai-u1kv4k

Define model variables vars for a frequency domain acoustic pressure field with model parameters pars:

https://wolfram.com/xid/0mfdtx00jbphniksai-njshna
Define silent initial conditions ics:

https://wolfram.com/xid/0mfdtx00jbphniksai-2uykky
Set up the equation with an acoustic radiation boundary at the left end, a pressure source of
and a radiation angle
of
:

https://wolfram.com/xid/0mfdtx00jbphniksai-ybech5

https://wolfram.com/xid/0mfdtx00jbphniksai-hpjmye

https://wolfram.com/xid/0mfdtx00jbphniksai-hb4etn

Define model variables vars for a frequency domain acoustic pressure field with model parameters pars:

https://wolfram.com/xid/0mfdtx00jbphniksai-exrmgh
Set up the equation with an acoustic radiation boundary at the left end, a pressure source of
and a radiation angle
of
:

https://wolfram.com/xid/0mfdtx00jbphniksai-gkaaae

https://wolfram.com/xid/0mfdtx00jbphniksai-xht1ym
Visualize the sound field in the frequency domain at various frequencies :

https://wolfram.com/xid/0mfdtx00jbphniksai-6luhf0

Convert the solution to the time domain:

https://wolfram.com/xid/0mfdtx00jbphniksai-t1egga

Scope (2)Survey of the scope of standard use cases
Define model variables vars for a transient acoustic pressure field with model parameters pars and a specific boundary condition parameter:

https://wolfram.com/xid/0mfdtx00jbphniksai-glqeii

Define model variables vars for a transient acoustic pressure field with model parameters pars and multiple specific parameters boundary conditions:

https://wolfram.com/xid/0mfdtx00jbphniksai-uwpzeb

https://wolfram.com/xid/0mfdtx00jbphniksai-hwq3hg


https://wolfram.com/xid/0mfdtx00jbphniksai-zk0k6a

Wolfram Research (2020), AcousticRadiationValue, Wolfram Language function, https://reference.wolfram.com/language/ref/AcousticRadiationValue.html.
Text
Wolfram Research (2020), AcousticRadiationValue, Wolfram Language function, https://reference.wolfram.com/language/ref/AcousticRadiationValue.html.
Wolfram Research (2020), AcousticRadiationValue, Wolfram Language function, https://reference.wolfram.com/language/ref/AcousticRadiationValue.html.
CMS
Wolfram Language. 2020. "AcousticRadiationValue." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/AcousticRadiationValue.html.
Wolfram Language. 2020. "AcousticRadiationValue." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/AcousticRadiationValue.html.
APA
Wolfram Language. (2020). AcousticRadiationValue. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AcousticRadiationValue.html
Wolfram Language. (2020). AcousticRadiationValue. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AcousticRadiationValue.html
BibTeX
@misc{reference.wolfram_2025_acousticradiationvalue, author="Wolfram Research", title="{AcousticRadiationValue}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/AcousticRadiationValue.html}", note=[Accessed: 08-June-2025
]}
BibLaTeX
@online{reference.wolfram_2025_acousticradiationvalue, organization={Wolfram Research}, title={AcousticRadiationValue}, year={2020}, url={https://reference.wolfram.com/language/ref/AcousticRadiationValue.html}, note=[Accessed: 08-June-2025
]}