Components.Partial.SimpleStaggeredFlowModel ​
Staggered-grid momentum flow model used inside the StraightPipe family.
Computes friction-plus-gravity pressure drops dps_f between N adjacent thermodynamic states. Set flow_model_mode = FromPressureDifference to compute the segment mass flows m_flows from the segment pressure drops, or FromMassFlow to compute the segment pressure drops from given m_flows. The caller (typically PartialStraightPipe) provides medium_data, the N states array linked to the bulk mediums, the per-segment geometry arrays (crossAreas, dimensions, roughnesses, dheights, diameters) via initial bindings, and the nominal friction parameters dp_nominal, m_flow_nominal, K_dp, dp_exp.
This component extends from PartialDistributedFlow
Usage ​
HVACComponents.Components.Partial.SimpleStaggeredFlowModel(pathLengths=missing, m_flow_start, medium_data, crossAreas=missing, dimensions=missing, roughnesses=missing, dheights=missing, diameters=missing, dp_nominal=missing, m_flow_nominal=missing, K_dp=missing, dp_exp=missing, p_a_start, p_b_start, h_a_start, h_b_start, crossAreas_start, dimensions_start, roughnesses_start, dheights_start, diameters_start, dp_nominal_start, m_flow_nominal_start, K_dp_start, dp_exp_start)
Parameters: ​
| Name | Description | Units | Default value |
|---|---|---|---|
N | Number of thermodynamic state points used by the flow model | – | |
m | Number of momentum segments between state points (= N - 1) | – | N - 1 |
N_Minus_1 | N - 1, alias used for momentum-array sizing | – | N - 1 |
flow_model_mode | Flow formulation: FromPressureDifference solves for m_flows; FromMassFlow solves for dps_f | – | |
m_flow_start | Initial mass flow rate [kg/s] (solver guess applied to every cell) | kg/s | |
medium_data | Refrigerant medium properties | – | |
p_a_start | Initial pressure at the inlet end (state 1) [Pa] | Pa | |
p_b_start | Initial pressure at the outlet end (state N) [Pa] | Pa | |
h_a_start | Initial specific enthalpy at the inlet end (state 1) [J/kg] | J/kg | |
h_b_start | Initial specific enthalpy at the outlet end (state N) [J/kg] | J/kg | |
crossAreas_start | Scalar guess for crossAreas [m^2] | – | |
dimensions_start | Scalar guess for dimensions [m] | – | |
roughnesses_start | Scalar guess for roughnesses [m] | – | |
dheights_start | Scalar guess for dheights [m] | – | |
diameters_start | Scalar guess for diameters [m] | – | |
dp_nominal_start | Scalar guess for dp_nominal [Pa] | Pa | |
m_flow_nominal_start | Scalar guess for m_flow_nominal [kg/s] | kg/s | |
K_dp_start | Scalar guess for K_dp | – | |
dp_exp_start | Scalar guess for dp_exp | – |
Variables ​
| Name | Description | Units |
|---|---|---|
m_flows | Mass flow rate in each momentum cell [kg/s] (length m) | kg/s |
Is | Momentum of fluid in each momentum cell [kg.m/s] (length m) | – |
Fs_p | Pressure force on each momentum cell [N] (length m); extender supplies | – |
Fs_fg | Friction-plus-gravity force on each momentum cell [N] (length m); extender supplies | – |
Ib_flows | Momentum flow across each cell boundary [N] (length m); extender supplies | – |
dps_f | Friction-only pressure drop per segment [Pa] (length N - 1) | Pa |
dps_fg | Friction-plus-gravity pressure drop per segment [Pa] (length N - 1) | Pa |