ntrfc.fluid package

Submodules

ntrfc.fluid.fluid module

ntrfc.fluid.fluid.mach_number(speed, specific_heat_ratio, specific_gas_constant, temperature)

Calculates the Mach number at a point in a gas.

Parameters: - speed: the speed of the gas - specific_heat_ratio: the ratio of specific heats for the gas - specific_gas_constant: the specific gas constant for the gas - temperature: the temperature of the gas

Returns: - the Mach number at the point

ntrfc.fluid.fluid.sutherland_viscosity(temperature, sutherland_constant=1.458e-06, reference_temperature=110.4)

Calculate the dynamic viscosity of a gas using Sutherland’s Law.

Parameters: - temperature (float): the temperature of the gas in degrees Kelvin - sutherland_constant (float): the Sutherland’s constant for the gas (default value is for air) - reference_temperature (float): the reference temperature for the gas, in degrees Kelvin (default value is for air)

Returns: - dynamic_viscosity (float): the dynamic viscosity of the gas, in units of square meters per second

ntrfc.fluid.fluid.total_pressure(kappa, mach_number, pressure)

Calculates the total pressure at a point in a gas using the isentropic flow equations. https://www.grc.nasa.gov/www/BGH/isentrop.html

Parameters: - kappa: the ratio of specific heats for the gas at the point - mach_number: the Mach number at the point - pressure: the pressure at the point

Returns: - the total pressure at the point

ntrfc.fluid.isentropic module

ntrfc.fluid.isentropic.isentropic_mach_number(isentropic_pressure, kappa, static_pressure, mach, gas_constant, static_temperature)

Calculates the isentropic Mach number.

Parameters:

  • isentropic_pressure (float) – Isentropic pressure of the flow.

  • kappa (float) – Specific heat ratio of the gas.

  • static_pressure (float) – Static pressure of the flow.

  • mach (float) – Mach number of the flow.

  • gas_constant (float) – Gas constant of the gas.

  • static_temperature (float) – Static temperature of the flow.

Returns:

Isentropic Mach number.

Return type:

float

ntrfc.fluid.isentropic.isentropic_reynolds_number(kappa, specific_gas_constant, chord_length, sutherland_reference_viscosity, mach_number, pressure, temperature, sutherland_reference_temperature)

Calculates the isentropic Reynolds number at a point in a gas flow.

Parameters: - kappa: the ratio of specific heats for the gas - specific_gas_constant: the specific gas constant for the gas - chord_length: the chord length of the body or structure - sutherland_reference_viscosity: the Sutherland reference viscosity - mach_number: the Mach number at the point - pressure: the pressure at the reference point - temperature: the temperature at the reference point - velocity_magnitude: the velocity magnitude at the reference point - isobaric_heat_constant: the isobaric heat constant - sutherland_reference_temperature: the Sutherland reference temperature

Returns: - the isentropic Reynolds number at the point

ntrfc.fluid.isentropic.isentropic_total_temperature(kappa, mach_number, temperature)

Calculates the isentropic total temperature at a point in a gas.

https://www.grc.nasa.gov/www/BGH/isentrop.html Eq #7

Parameters: - kappa: the ratio of specific heats for the gas - mach_number: the Mach number at the point - temperature: the temperature at the point

Returns: - the isentropic total temperature at the point

ntrfc.fluid.isentropic.ma_is(outflow_static_pressure, isentropic_exponent, pressure, velocity, gas_constant, temperature)

Calculate the isentropic Mach number at the outflow of a system.

Parameters:

  • outflow_static_pressure (float) – static pressure at the outflow (Pa)

  • isentropic_exponent (float) – isentropic exponent of the gas

  • pressure (float) – pressure at a reference point in the flow (Pa)

  • density (float) – density at the reference point (kg/m^3)

  • velocity (float) – velocity at the reference point (m/s)

  • gas_constant (float) – gas constant of the gas (J/kg*K)

  • temperature (float) – temperature at the reference point (K)

Returns:

isentropic Mach number at the outflow

Return type:

float

ntrfc.fluid.isentropic.mach_is_x(kappa, p_blade, p_frestream)
ntrfc.fluid.isentropic.p_is_from_mach(kappa, ma, p_t_is)
ntrfc.fluid.isentropic.p_t_is_from_mach(kappa, mach_number, static_pressure)
ntrfc.fluid.isentropic.temp_is(kappa, ma, Tt)
ntrfc.fluid.isentropic.temp_t_is(kappa, ma, T)

ntrfc.fluid.turbulence module

ntrfc.fluid.turbulence.calcFluc(velo)
ntrfc.fluid.turbulence.calcRey(u, v, w)
ntrfc.fluid.turbulence.calcTke(u_2, v_2, w_2)
ntrfc.fluid.turbulence.calcTkeByTu(Tu, Uabs)
ntrfc.fluid.turbulence.calcTu(tke, Uabs)

Module contents