96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
from __future__ import annotations
|
|
|
|
from collections.abc import Mapping
|
|
from math import pi
|
|
|
|
from PythonModels.core.base import AlgebraicComponent
|
|
from PythonModels.core.equations import EquationResidual
|
|
from PythonModels.core.medium import IdealGasMedium
|
|
from PythonModels.core.ports import PortState
|
|
|
|
|
|
class ResistivePipe(AlgebraicComponent):
|
|
"""Quasi-steady Darcy resistance used by topology-driven simulation."""
|
|
|
|
def __init__(
|
|
self,
|
|
name: str,
|
|
medium: IdealGasMedium,
|
|
L: float = 5.0,
|
|
D: float = 0.02,
|
|
lambda_darcy: float = 0.02,
|
|
p0: float = 1e5,
|
|
T0: float = 300.0,
|
|
) -> None:
|
|
super().__init__(name=name)
|
|
self.medium = medium
|
|
self.L = L
|
|
self.D = D
|
|
self.lambda_darcy = lambda_darcy
|
|
self.p0 = p0
|
|
self.T0 = T0
|
|
self.area = pi * D * D / 4.0
|
|
initial_h = medium.specific_enthalpy(T0)
|
|
|
|
self.port_a = PortState.pneumatic("port_a", nominal_role="inlet")
|
|
self.port_a.p = p0
|
|
self.port_a.h_outflow = initial_h
|
|
self.register_port(self.port_a)
|
|
|
|
self.port_b = PortState.pneumatic("port_b", nominal_role="outlet")
|
|
self.port_b.p = p0
|
|
self.port_b.h_outflow = initial_h
|
|
self.register_port(self.port_b)
|
|
|
|
def pressure_drop(self, m_flow_a: float, p_a: float, p_b: float) -> float:
|
|
average_pressure = max(0.5 * (p_a + p_b), 1.0)
|
|
density = max(self.medium.density(average_pressure, self.T0), 1e-12)
|
|
resistance = self.lambda_darcy * (self.L / self.D)
|
|
return (
|
|
resistance
|
|
* m_flow_a
|
|
* abs(m_flow_a)
|
|
/ (2.0 * density * self.area * self.area)
|
|
)
|
|
|
|
def pressure_flow_equation_residuals(self) -> tuple[EquationResidual, ...]:
|
|
return (
|
|
EquationResidual(
|
|
id=f"{self.name}:mass_flow_balance",
|
|
owner="component",
|
|
owner_id=self.name,
|
|
relation="sumToZero",
|
|
variables=(
|
|
f"{self.name}.port_a.m_flow",
|
|
f"{self.name}.port_b.m_flow",
|
|
),
|
|
role="flow",
|
|
value=self.port_a.m_flow + self.port_b.m_flow,
|
|
),
|
|
EquationResidual(
|
|
id=f"{self.name}:darcy_pressure_loss",
|
|
owner="component",
|
|
owner_id=self.name,
|
|
relation="constitutive",
|
|
variables=(
|
|
f"{self.name}.port_a.p",
|
|
f"{self.name}.port_b.p",
|
|
f"{self.name}.port_a.m_flow",
|
|
),
|
|
role="effort",
|
|
value=(
|
|
self.port_a.p
|
|
- self.port_b.p
|
|
- self.pressure_drop(
|
|
self.port_a.m_flow,
|
|
self.port_a.p,
|
|
self.port_b.p,
|
|
)
|
|
),
|
|
),
|
|
)
|
|
|
|
def update_stream_outflows(self, connected_h: Mapping[str, float]) -> None:
|
|
self.port_a.h_outflow = connected_h["port_b"]
|
|
self.port_b.h_outflow = connected_h["port_a"]
|