pyva.properties.materialClasses.Fluid

class pyva.properties.materialClasses.Fluid(c0=343.0, rho0=1.23, eta=0.01, dynamic_viscosity=1.84e-05, kappa=1.4, Cp=1005.1, heat_conductivity=0.0257673, **kwargs)

Bases: object

The fluid class deals with fluid properties including damping

This class implements some methods that may not seem reasonable for standart fluids, for example the frequency dependent methods for speed of sound and impedance. They are defined in such a way so that every daugther class can implement those methods especially when they are frequency dependent as for example in case of the equivalent fluid model for fibre materials

c0

Speed of sound

Type:: complex

rho0

Density

Type:: complex

eta

Damping loss

Type:: float

dampingModell

Identifier for damping model

Type:: str

__init__(c0=343.0, rho0=1.23, eta=0.01, dynamic_viscosity=1.84e-05, kappa=1.4, Cp=1005.1, heat_conductivity=0.0257673, **kwargs)

Constructor for Fluid

Parameters:

c0 (complex, optional) – Speed of sound. The default is 343..
rho0 (complex, optional) – density. The default is 1.23.
eta (float, optional) – Damping loss. The default is 0.01.
dynamic_viscosity (float, optional) – Dynamic viscosity. The default is 1.84e-5.
kappa (float, optional) – ratio of specific heat capacities. The default is 1.4.
Cp (float, optional) – Heat capacity at constant pressure. The default is 1.0051.
heat_conductivity (float, optional) – Heat conductivity. The default is 0.0257673.
**kwargs (dict) – Arbitrary keyword argument list.
dampingModell (str) – Identifier for damping model

Raises:

ValueError – DESCRIPTION.

Return type:

None.

Examples

import materialClasses as mc myAir = mc.Fluid()

Methods

`__init__`([c0, rho0, eta, dynamic_viscosity, ...])	Constructor for Fluid
`absorption`(omega, impedance[, theta])	Absorption coefficient for interface to other fluids
`absorption_diffuse`(omega, z[, theta_max, ...])	Diffuse absorption coefficient for interface to other fluids
`acoustic_FE`(omega, S[, ID])	Acoustic Finite Element radiator/end condition of plane wave fluid
`air`(temperature, pressure[, h_rel])	Determine precise properties of air from ambient conditions.
`c_freq`([omega])	Complex, frequency dependent speed of sound
`damping`(omega)	Damping loss
`impedance`([omega])	Complex characteristic impedance including damping
`infinite_layer_TM`(omega, wavenumber, thickness)	Calculated transfermatrix of infinite fluid layer
`reflection_factor`(omega, impedance[, theta, ...])	Refection factor for interface to other fluids
`rho_freq`(omega)	density of fluid
`shear_wavenumber`(omega)	Shear wavenumber according to Maa's theory
`wavelength`(omega)	param omega: DESCRIPTION.
`wavenumber`(omega)	Wavenumber including damping

Attributes

`Pr`	Prandtl number.
`diffusivity`	Diffusivity.
`kinematic_viscosity`	Kinematic viscosity.
`nu0`	Kinematic viscosity.
`z0`	Real characteristic impedance without damping

property Pr

Prandtl number.

Returns:: Prandtl number.
Return type:: float

absorption(omega, impedance, theta=0)

Absorption coefficient for interface to other fluids

Parameters:

omega (float) – angular frequency.
impedance (complex) – impedance of interfacing fluid.
theta (float, optional) – angle of incidence. The default is 0.

Returns:

Absorption coefficient.

Return type:

complex

absorption_diffuse(omega, z, theta_max=1.5550883635269477, theta_step=0.015707963267948967)

Diffuse absorption coefficient for interface to other fluids

Parameters:

omega (float) – angular frequency.
z (complex) – impedance.
theta_max (float, optional) – Maximum integration angle. The default is np.pi/2*0.99.
theta_step (float, optional) – Angle integration step. The default is np.pi/200.

Returns:

alpha – diffuse field absorption coefficient.

Return type:

float

acoustic_FE(omega, S, ID=[1], **kwargs)

Acoustic Finite Element radiator/end condition of plane wave fluid