Standardization of Thermo-Fluid Modeling in Modelica.Fluid

Rüdiger Franke
ABB AG, Germany

Francesco Casella
Politecnico di Milano, Italy

Michael Sielemann
DLR Institute for Robotics and Mechatronics, Germany

Katrin Proelß
TU Hamburg-Harburg, Germany

Martin Otter
DLR Institute for Robotics and Mechatronics, Germany

Michael Wetter

Ladda ner artikelhttp://dx.doi.org/10.3384/ecp09430077

Ingår i: Proceedings of the 7th International Modelica Conference; Como; Italy; 20-22 September 2009

Linköping Electronic Conference Proceedings 43:13, s. 122-131

Visa mer +

Publicerad: 2009-12-29

ISBN: 978-91-7393-513-5

ISSN: 1650-3686 (tryckt), 1650-3740 (online)


This article discusses the Modelica.Fluid library that has been included in the Modelica Standard Library 3.1. Modelica.Fluid provides interfaces and basic components for the device-oriented modeling of onedimensional thermo-fluid flow in networks containing vessels; pipes; fluid machines; valves and fittings.

A unique feature of Modelica.Fluid is that the component equations and the media models as well as pressure loss and heat transfer correlations are decoupled from each other. All components are implemented such that they can be used for media from the Modelica.Media library. This means that an incompressible or compressible medium; a single or a multiple substance medium with one or more phases might be used with one and the same model as long as the modeling assumptions made hold. Furthermore;

trace substances are supported. Modeling assumptions can be configured globally in an outer System object. This covers in particular the initialization; uni- or bi-directional flow; and dynamic or steady-state formulation of mass; energy; and momentum balance. All assumptions can be locally refined for every component.

While Modelica.Fluid contains a reasonable set of component models; the goal of the library is not to provide a comprehensive set of models; but rather to provide interfaces and best practices for the treatment of issues such as connector design and implementation of energy; mass and momentum balances. Applications from various domains are presented.


Modelica; thermo-fluid; one dimensional fluid flow; single substance; multi substance; trace substances


[1] H. Elmqvist; H. Tummescheit; M. Otter: Object-Oriented Modeling of Thermo-Fluid Systems; Modelica 2003 Conference; Linköping; November 2003.

www.modelica.org/events/Conference2003/papers/h40_Elmqvist_fluid.pdf [2] F. Casella; M. Otter; K. Proelss; C. Richter; H. Tummescheit: The Modelica Fluid and Media Library for Modeling of Incompressible and Compressible Thermo-Fluid Pipe Networks; Modelica 2006 Conference; Vienna; September 2006. www.modelica.org/events/modelica2006/Proceedings/sessions/Session6b1.pdf

[3] R. Franke; F. Casella; M. Otter; M.Sielemann; H.Elmqvist; S.E. Mattson; H. Olsson: Stream Connectors; Modelica 2009 Conference.

[4] R. Franke; K. Krüger; M. Rode: On-line Optimization of Drum Boiler Startup; Modelica 2003 Conference; Linköping; November 2003.

www.modelica.org/events/Conference2003/papers/h29_Franke.pdf [5] M. G. Gasparo and R. Morandi: Piecewise cubic monotone interpolation with assigned slopes. Computing 46; pages 355-365; 1991. doi: 10.1007/BF02257779

[6] I.E. Idelchik: Handbook of Hydraulic Resistance. Jaico Publishing House; 2005.

[7] Verein Deutscher Ingenieure (1997): VDI Wärmeatlas. Springer Verlag; Ed. 8; 1997.

Citeringar i Crossref