Phenomenological extensions to APROS six-equation model. Non-condensable gas, supercritical pressure, improved CCFL and reduced numerical diffusion for scalar transport calculation

Dissertation

Markku Hänninen

Research output: ThesisDissertationCollection of Articles

4 Citations (Scopus)

Abstract

This thesis focuses on the development of the two-fluid model of the APROS simulation program. The system of constitutive equations and how equations are related to basic equations have been presented and discussed. The new non-condensable gas model, which was implemented to the two-fluid model, has been described in detail. The extension of the non-condensable gas model to the two-fluid system and the validation of the model have also been presented. The changes made to the six-equation model when the model has been applied to supercritical pressure calculation have been depicted. Finally, the author describes how the whole complicated system is verified and validated. Through the simulations, the applicability of the two-phase model for the analyses of real plant applications is substantiated and verified. In addition to this summary, the thesis consists of four publications. The first paper deals with how the CCFL (Counter Current Flow Limitation) correlations have been implemented to the code and how these correlations have been veri-fied. In the second paper, the non-condensable gas model and its implementation to the two-fluid model have been presented. The third paper describes how the sharp temperature distribution can be maintained in the liquid flow through the aid of simple higher order discretization. In the fourth paper, the modifications carried out to the two-fluid model when applied to the calculation of the super-critical pressure flow are described and discussed.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Lappeenranta University of Technology
Supervisors/Advisors
  • Kyrki-Rajamäki, Riitta, Supervisor, External person
Award date27 Nov 2009
Place of PublicationEspoo
Publisher
Print ISBNs978-951-38-7367-7
Electronic ISBNs978-951-38-7368-4
Publication statusPublished - 2009
MoE publication typeG5 Doctoral dissertation (article)

Fingerprint

Gases
Fluids
Constitutive equations
Temperature distribution
Liquids

Keywords

  • two-fluid model
  • two-phase flow
  • interface heat transfer
  • interface friction
  • wall heat transfer
  • boiling crisis
  • non-condensable gas
  • dissolved gas
  • counter current flow limitation
  • discreatization
  • validation
  • supercritical pressure
  • nuclear power plant
  • APROS

Cite this

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title = "Phenomenological extensions to APROS six-equation model. Non-condensable gas, supercritical pressure, improved CCFL and reduced numerical diffusion for scalar transport calculation: Dissertation",
abstract = "This thesis focuses on the development of the two-fluid model of the APROS simulation program. The system of constitutive equations and how equations are related to basic equations have been presented and discussed. The new non-condensable gas model, which was implemented to the two-fluid model, has been described in detail. The extension of the non-condensable gas model to the two-fluid system and the validation of the model have also been presented. The changes made to the six-equation model when the model has been applied to supercritical pressure calculation have been depicted. Finally, the author describes how the whole complicated system is verified and validated. Through the simulations, the applicability of the two-phase model for the analyses of real plant applications is substantiated and verified. In addition to this summary, the thesis consists of four publications. The first paper deals with how the CCFL (Counter Current Flow Limitation) correlations have been implemented to the code and how these correlations have been veri-fied. In the second paper, the non-condensable gas model and its implementation to the two-fluid model have been presented. The third paper describes how the sharp temperature distribution can be maintained in the liquid flow through the aid of simple higher order discretization. In the fourth paper, the modifications carried out to the two-fluid model when applied to the calculation of the super-critical pressure flow are described and discussed.",
keywords = "two-fluid model, two-phase flow, interface heat transfer, interface friction, wall heat transfer, boiling crisis, non-condensable gas, dissolved gas, counter current flow limitation, discreatization, validation, supercritical pressure, nuclear power plant, APROS",
author = "Markku H{\"a}nninen",
note = "Project code: 32753",
year = "2009",
language = "English",
isbn = "978-951-38-7367-7",
series = "VTT Publications",
publisher = "VTT Technical Research Centre of Finland",
number = "720",
address = "Finland",
school = "Lappeenranta University of Technology",

}

Phenomenological extensions to APROS six-equation model. Non-condensable gas, supercritical pressure, improved CCFL and reduced numerical diffusion for scalar transport calculation : Dissertation. / Hänninen, Markku.

Espoo : VTT Technical Research Centre of Finland, 2009. 91 p.

Research output: ThesisDissertationCollection of Articles

TY - THES

T1 - Phenomenological extensions to APROS six-equation model. Non-condensable gas, supercritical pressure, improved CCFL and reduced numerical diffusion for scalar transport calculation

T2 - Dissertation

AU - Hänninen, Markku

N1 - Project code: 32753

PY - 2009

Y1 - 2009

N2 - This thesis focuses on the development of the two-fluid model of the APROS simulation program. The system of constitutive equations and how equations are related to basic equations have been presented and discussed. The new non-condensable gas model, which was implemented to the two-fluid model, has been described in detail. The extension of the non-condensable gas model to the two-fluid system and the validation of the model have also been presented. The changes made to the six-equation model when the model has been applied to supercritical pressure calculation have been depicted. Finally, the author describes how the whole complicated system is verified and validated. Through the simulations, the applicability of the two-phase model for the analyses of real plant applications is substantiated and verified. In addition to this summary, the thesis consists of four publications. The first paper deals with how the CCFL (Counter Current Flow Limitation) correlations have been implemented to the code and how these correlations have been veri-fied. In the second paper, the non-condensable gas model and its implementation to the two-fluid model have been presented. The third paper describes how the sharp temperature distribution can be maintained in the liquid flow through the aid of simple higher order discretization. In the fourth paper, the modifications carried out to the two-fluid model when applied to the calculation of the super-critical pressure flow are described and discussed.

AB - This thesis focuses on the development of the two-fluid model of the APROS simulation program. The system of constitutive equations and how equations are related to basic equations have been presented and discussed. The new non-condensable gas model, which was implemented to the two-fluid model, has been described in detail. The extension of the non-condensable gas model to the two-fluid system and the validation of the model have also been presented. The changes made to the six-equation model when the model has been applied to supercritical pressure calculation have been depicted. Finally, the author describes how the whole complicated system is verified and validated. Through the simulations, the applicability of the two-phase model for the analyses of real plant applications is substantiated and verified. In addition to this summary, the thesis consists of four publications. The first paper deals with how the CCFL (Counter Current Flow Limitation) correlations have been implemented to the code and how these correlations have been veri-fied. In the second paper, the non-condensable gas model and its implementation to the two-fluid model have been presented. The third paper describes how the sharp temperature distribution can be maintained in the liquid flow through the aid of simple higher order discretization. In the fourth paper, the modifications carried out to the two-fluid model when applied to the calculation of the super-critical pressure flow are described and discussed.

KW - two-fluid model

KW - two-phase flow

KW - interface heat transfer

KW - interface friction

KW - wall heat transfer

KW - boiling crisis

KW - non-condensable gas

KW - dissolved gas

KW - counter current flow limitation

KW - discreatization

KW - validation

KW - supercritical pressure

KW - nuclear power plant

KW - APROS

M3 - Dissertation

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PB - VTT Technical Research Centre of Finland

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