PartialDistributedVolumeBase class for distributed volume models |
Information
This information is part of the Modelica Standard Library maintained by the Modelica Association.
Interface and base class for n ideally mixed fluid volumes with the ability to store mass and energy.
It is intended to model a one-dimensional spatial discretization of fluid flow according to the finite volume method.
The following boundary flow and source terms are part of the energy balance and must be specified in an extending class:
Qb_flows[n], heat flow term, e.g., conductive heat flows across segment boundaries, andWb_flows[n], work term.
The component volumes fluidVolumes[n] are an input that needs to be set in an extending class to complete the model.
Further source terms must be defined by an extending class for fluid flow across the segment boundary:
Hb_flows[n], enthalpy flow,mb_flows[n], mass flow,mbXi_flows[n], substance mass flow, andmbC_flows[n], trace substance mass flow.
Parameters (13)
| n |
Value: 2 Type: Integer Description: Number of discrete volumes |
|---|---|
| energyDynamics |
Value: system.energyDynamics Type: Dynamics Description: Formulation of energy balances |
| massDynamics |
Value: system.massDynamics Type: Dynamics Description: Formulation of mass balances |
| substanceDynamics |
Value: massDynamics Type: Dynamics Description: Formulation of substance balances |
| traceDynamics |
Value: massDynamics Type: Dynamics Description: Formulation of trace substance balances |
| p_a_start |
Value: system.p_start Type: AbsolutePressure (Pa) Description: Start value of pressure at port a |
| p_b_start |
Value: p_a_start Type: AbsolutePressure (Pa) Description: Start value of pressure at port b |
| ps_start |
Value: if n > 1 then linspace(p_a_start, p_b_start, n) else {(p_a_start + p_b_start) / 2} Type: AbsolutePressure[n] (Pa) Description: Start value of pressure |
| use_T_start |
Value: true Type: Boolean Description: Use T_start if true, otherwise h_start |
| T_start |
Value: if use_T_start then system.T_start else Medium.temperature_phX((p_a_start + p_b_start) / 2, h_start, X_start) Type: Temperature (K) Description: Start value of temperature |
| h_start |
Value: if use_T_start then Medium.specificEnthalpy_pTX((p_a_start + p_b_start) / 2, T_start, X_start) else Medium.h_default Type: SpecificEnthalpy (J/kg) Description: Start value of specific enthalpy |
| X_start |
Value: Medium.X_default Type: MassFraction[Medium.nX] (kg/kg) Description: Start value of mass fractions m_i/m |
| C_start |
Value: Medium.C_default Type: ExtraProperty[Medium.nC] Description: Start value of trace substances |
Inputs (1)
| fluidVolumes |
Type: Volume[n] (m³) Description: Discretized volume, determine in inheriting class |
|---|
Components (2)
 |
system |
Type: System Description: System properties |
|---|---|---|
 |
mediums |
Type: BaseProperties[n] |
Extended by (1)
 |
Modelica.Fluid.Pipes.BaseClasses Base class for distributed flow models |