Article | Proceedings of the 10<sup>th</sup> International Modelica Conference; March 10-12; 2014; Lund; Sweden | A physical solution for solving the zero-flow singularity in static thermal-hydraulics mixing models
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Title:
A physical solution for solving the zero-flow singularity in static thermal-hydraulics mixing models
Author:
Daniel Bouskela: EDF R&D, Chatou Cedex, France Baligh El Hefni: EDF R&D, Chatou Cedex, France
DOI:
10.3384/ecp14096847
Download:
Full text (pdf)
Year:
2014
Conference:
Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden
Issue:
096
Article no.:
088
Pages:
847-855
No. of pages:
9
Publication type:
Abstract and Fulltext
Published:
2014-03-10
ISBN:
978-91-7519-380-9
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press; Linköpings universitet


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For the 0D-1D modelling of thermalhydraulics systems; it is common practice to use static mixing models to compute the mixing specific enthalpy in fluid junctions such as mergers or splitters. However; this simplification leads to a well known singularity when the mass flow rate inside the junction goes to zero. The origin of the singularity is explained; and a rigorous physical solution is proposed to eliminate the singularity. A prototype implementation has been developed in the ThermoSysPro library for power plant modelling that illustrates the interest of the proposed solution and enables to evaluate the computing overhead with respect to several possible variants.

Keywords: Thermal-hydraulics; mixing models; convection; diffusion; ThermoSysPro

Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden

Author:
Daniel Bouskela, Baligh El Hefni
Title:
A physical solution for solving the zero-flow singularity in static thermal-hydraulics mixing models
DOI:
http://dx.doi.org/10.3384/ecp14096847
References:

[1] El Hefni B., Bouskela D., Lebreton G., ‚ÄėDynamic modelling of a combined cycle power plant with ThermoSysPro‚Äô, Modelica 2011 conference proceedings.


[2] Patankar S.V., ‚ÄėNumerical Heat Transfer and Fluid Flow‚Äô, Hemisphere Publishing Corporation, Taylor & Francis, 1980.


[3] Franke R., Casella F., Otter M., Sielemann M., Elmqvist H., Mattson S.E., Olsson H., ‚ÄėStream Connectors ‚Äď An extension of Modelica for Device-Oriented Modeling of Convective Transport Phenomena‚Äô, Modelica 2009 conference proceedings.

Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden

Author:
Daniel Bouskela, Baligh El Hefni
Title:
A physical solution for solving the zero-flow singularity in static thermal-hydraulics mixing models
DOI:
http://dx.doi.org/10.3384/ecp14096847
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