.Buildings.ThermalZones.Detailed.BaseClasses.CFDFluidInterface

Information

This model is used to connect the fluid port with the block that communicates with the CFD program.

This model also implements the pressure balance of the medium, as the FFD implementation uses a constant pressure that is independent of the pressure of the Modelica model. If the parameter massDynamics == Modelica.Fluid.Types.Dynamics.SteadyState, then there is a steady-state mass balance and the pressure of the room is an algebraic variable. Otherwise, the time derivative of the pressure is

dp⁄dt = p__start   ∑ ṁ_i ⁄ m_start,

where p__start is the initial pressure, ∑ ṁ_i is the sum of the mass flow rates over all ports, and m_start is the initial mass of the room.

Contents

Revisions

• July 24, 2014, by Wangda Zuo and Michael Wetter:
  Removed the parameter initialize_p. This parameter is used in .Media as equations are obtained from BaseProperties. This implementation does not use Medium.BaseProperties and hence this parameter is not needed.
• July 24, 2014, by Wangda Zuo and Michael Wetter:
  Changed minimum attribute for nPorts from 2 to 0 as the FFD code uses atmospheric pressure and hence does not use the pressure of the fluid connector.
• January 25, 2014, by Wangda Zuo:
  Added unit for mass flow rate.
• July 20, 2013, by Michael Wetter:
  First implementation.