Article | Proceedings of the 7th International Modelica Conference; Como; Italy; 20-22 September 2009 | Stream Connectors - An Extension of Modelica for Device-Oriented Modeling of Convective Transport Phenomena

Title:
Stream Connectors - An Extension of Modelica for Device-Oriented Modeling of Convective Transport Phenomena
Author:
Rüdiger Franke: ABB AG, Germany Francesco Casella: Politecnico di Milano, Italy Martin Otter: DLR Institute for Robotics and Mechatronics, Germany Michael Sielemann: DLR Institute for Robotics and Mechatronics, Germany Hilding Elmqvist: Dassault Syst√®mes (Dynasim), Sweden Mattson Sven Erik: Dassault Syst√®mes (Dynasim), Sweden Olsson Hans: Dassault Syst√®mes (Dynasim), Sweden
DOI:
10.3384/ecp09430078
Download:
Full text (pdf)
Year:
2009
Conference:
Proceedings of the 7th International Modelica Conference; Como; Italy; 20-22 September 2009
Issue:
043
Article no.:
012
Pages:
108-121
No. of pages:
14
Publication type:
Abstract and Fulltext
Published:
2009-12-29
ISBN:
978-91-7393-513-5
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press; Linköpings universitet


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Modelica 3.0 as well as other physical modeling languages have two basic variable types to describe the interaction of physical components: ‚ÄúPotential‚ÄĚ (or across) variable and ‚Äúflow‚ÄĚ (or through) variable. It is shown that with these variable types it is not possible to describe in a numerically sound way bidirectional flow of matter. Other alternatives based on signal flow oriented modeling have severe restrictions how components can be connected together.

This fundamental problem is addressed in Modelica 3.1 by introducing a third type of connector variable for physical systems; called stream variable; declared with the prefix stream.

This article motivates and introduces stream variables. Examples are given for their utilization in basic fluid models.

Keywords: Thermo-fluid; stream variable; convection; potential/flow variable; across/through variable

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

Author:
Rüdiger Franke, Francesco Casella, Martin Otter, Michael Sielemann, Hilding Elmqvist, Mattson Sven Erik, Olsson Hans
Title:
Stream Connectors - An Extension of Modelica for Device-Oriented Modeling of Convective Transport Phenomena
DOI:
http://dx.doi.org/10.3384/ecp09430078
References:

[1] R.P. Brent (1973): Algorithms for Minimization without derivatives. Prentice Hall; pp. 58-59.


[2] F. Casella; A. Leva (2003): Modelica open library for power plant simulation: design and experimental validation. Proceedings of the Modelica 2003 Conference; editor: P. Fritzson; Linköping; Sweden. www.modelica.org/events/Conference2003/papers/h08_Leva.pdf


[3] Dymola (2009). Dymola Version 7.2. Dassault Systèmes; Lund; Sweden (Dynasim). www.dymola.com


[4] H. Elmqvist; H. Tummescheit; M. Otter (2003): Object-Oriented Modeling of Thermo-Fluid Systems. Proceedings of the Modelica 2003 Conference; editor: P. Fritzson; Linköping; Sweden. www.modelica.org/events/Conference2003/papers/h40_Elmqvist_fluid.pdf


[5] R. Franke; F. Casella; M. Sielemann; K. Proelss; M.Otter; M. Wetter (2009): Standardization of thermo-fluid modeling in Modelica.Fluid. Proceedings of the Modelica 2009 Conference; editor: F. Casella; Como; Italy. www.modelica.org/events/modelica2009


[6] Modelica (2009): Modelica Language Specification; Version 3.1. www.modelica.org/documents/ModelicaSpec31.pdf


[7] H. Olsson; M. Otter; S.E. Mattsson; H. Elmqvist (2008): Balanced Models in Modelica 3.0 for Increased Model Quality. Proceedings of the Modelica 2008 Conference; editor: B. Bachmann; Bielefeld; Germany. www.modelica.org/events/modelica2008/Proceedings/sessions/session1a3.pdf


[8] SimulationX (2009). SimulationX Version 3.2. ITI; Dresden; Germany. www.simulationx.com

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

Author:
Rüdiger Franke, Francesco Casella, Martin Otter, Michael Sielemann, Hilding Elmqvist, Mattson Sven Erik, Olsson Hans
Title:
Stream Connectors - An Extension of Modelica for Device-Oriented Modeling of Convective Transport Phenomena
DOI:
http://dx.doi.org/10.3384/ecp09430078
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