This package contains the library QSSFluidFlow (Quasi-Steady-State FluidFlow) with packages for components to store, transfer and control the flow of liquids:

The library consideres flow to be quasi-steady-state, i.e., no momentum balance is formulated. The fluid properties are defined as constants (density, kinematic viscosity).

For documentation, see the paper Modelica Library for Hybrid Simulation of Mass Flow in Process Plants available on the Modelica webpage, proceedings of the 2nd International Modelica Conference, March 18-19, 2002, which took place at the "Deutsches Zentrum fur Luft- und Raumfahrt" in Oberpfaffenhofen, Germany. The document is also available in this library's folder Modelica Library for Hybrid Simulation of Mass Flow in Process Plants.

The slide presentation of the library at the 2nd International Modelica Conference is also available electronically Presentation: FluidFlow Library.

Please note, several model components are of a somewhat experimental character, they are identified as such in the html-documentation of the respective components or are placed in seperate sub-folders of the library. They may serve as a basis for further developments and tests.

The libraries focus is rather on system behavior, not the very details of individual components. Questions like, how behaves a certain arrangement of serveral tanks, pipe segments, sensors, actuators and controllers or how long does it take to discharge the contents of a vessel via its lower flange and a pipe of 10 m lenght and 40 mm diameter, are of greater interest here than very detailed particularities of say flow regime in pipes. This does not limit the possibility of adding more detailed component models though. During my own education to become a mechanical engineer, I would have been most happy to have a language as Modelica and respective computer tools available to experiment in fluid dynamics classes with systems composed of tanks, pipes, valves or other armatures in flow channels. The learing effect of building and simulating such models can be great and complement application of e.g., Bernoulli in an analytical fashion with pen and paper.

Stefan Fabricius
Swiss Federal Institute of Technology (ETH)
Laboratory for Safety Analysis
Weinbergstrasse 11
8001 Zurich
email: fabricius@lsa.iet.mavt.ethz.ch

Release History and Notes:

Copyright (C) 2002, with the author.

The FluidFlow library is free software; it can be redistributed and/or modified under the terms of the Modelica license, see the license conditions in the documentation to Modelica.

The library comes with absolutely no warranty. It has been carefully tested, yet, the absence of faults or bugs cannot be guaranteed.

Comments or bug reports are most welcome.


Name Description
Valves Control valves

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