Acoustics Material Properties
Under Acoustics, you find the following acoustic material models with their associated material properties: a
Poroacoustics Model
, a
Thermoviscous Acoustics Model
, and a
Viscous Model
.
These material property groups are used by the Acoustics Module.
Table 2-15:
Acoustics Material property groups and properties.
Property Group and Property
Name/Variable
SI Unit
Anisotropic acoustics model
Effective density
rho_eff_iso (3-by-3 matrix)
m
2
/s
Effective bulk modulus
K_eff
Pa
Attenuation and Dissipation Model
Sound diffusivity
delta_diff
m
2
/s
Nonlinear Model
Parameter of nonlinearity
BA
1
Poroacoustics Model
Flow resistivity
Rf
Pa·s/m
2
Thermal characteristic length
Lth
m
Viscous characteristic length
Lv
m
Tortuosity factor
tau
1
Thermoviscous acoustics Model
Bulk viscosity
muB
Pa·s
Density
rho
kg/m
3
Dynamic viscosity
mu
Pa·s
Heat capacity at constant pressure
Cp
J/(kg·K)
Thermal conductivity
k
W/(m·K)
Viscous Model
Bulk viscosity
muB
Pa·s