.ThermofluidStream.Processes.Internal.SISOFlowAdvanced

Information

• For setFlow=false, this model is equivalent to ThermofluidStream.Interfaces.SISOFlow, i.e it uses the approach:

  der(inlet.m_flow)*L = inlet.r - outlet.r;
  p_out = p_in + dp;
  

  where the pressure difference dp + dr is given and the mass flow rate m_flow is adapted based on the (negative) inertial pressure difference -dr = inlet.r - outlet.r.
  The inertance L is its 'time constant' (strictly speaking by dimensional analysis (Buckingham pi theorem) one can derive that the time constant TC ~ L*dp_stationary/m_flow_stationary). The inertance L can be derived from instationary Bernoulli equation.
• For setFlow=true, this model is an extension of ThermofluidStream.Boundaries.TerminalSource, i.e it uses the approach:

  TC * der(dp) = outlet.r - inlet.r;
  p_out = p_in + dp;
  

  where the mass flow rate m_flow is given and the pressure difference dp is adapted based on the (positive) inertial pressure difference dr = outlet.r - inlet.r.
  Currently the time constant TC is used as a numerical tool. It might have a physical explanation considering the pressure change der(dp) of a volume for a given inflow/outflow.
  Use dp(start=0) or dp(final start=0) if setFlow=true.

Contents

Name	Description
Medium	Medium model

Revisions

• May 2025, by Raphael Gebhart (raphael.gebhart@dlr.de):
  Initial version.