3D core thermal hydraulics with the PORFLO code: Turbulence modelling and porous medium with porosity steps

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Abstract

VTT is developing a 3D two-phase flow solver code called PORFLO with the objective of enabling coupled reactor dynamics simulations through a parallel computation and porous medium description of complex geometries. The current features include unstructured mesh usage, 6-equation flow solution, k-ε turbulence modeling and MPI parallelization. The present applications are fuel bundles and cores of VVER and EPR, with a steam generator and core debris bed having been simulated previously. In this work, the main new developments are improved turbulence modeling, improved interpolation of face velocities in porous medium, and new improved modeling of EPR plant. The recent work examines porous medium based macroscopic models for turbulence quantities in the fuel assembly sub-channels. A few modifications in the standard k-ε turbulence model were tested against experimental data from the AGATE, MATiS-H and IVO VVER LDA measurements. In the coupled solution of pressure and velocities, problems were encountered at locations with a large change in the porosity. In the latest development, the pressure weighted momentum interpolation of face velocities was modified to explicitly account for the interphase drag term, in a manner similar to the Coupled Phasic Exchange Algorithm. In this work, the improved two-phase solver was tested in single-phase cases.
Original languageEnglish
Title of host publicationProceedings of the 22th International Conference on Nuclear Engineering, ICONE22
Subtitle of host publicationVolume 4: Radiation Protection and Nuclear Technology Applications; Fuel Cycle, Radioactive Waste Management and Decommissioning; Computational Fluid Dynamics (CFD) and Coupled Codes; Reactor Physics and Transport Theory
PublisherAmerican Society of Mechanical Engineers ASME
Number of pages11
Volume4
ISBN (Print)978-0-7918-4594-3
DOIs
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
Event22nd International Conference on Nuclear Engineering, ICONE 22 - Prague, Czech Republic
Duration: 7 Jul 201411 Jul 2014

Conference

Conference22nd International Conference on Nuclear Engineering, ICONE 22
Abbreviated titleICONE22
CountryCzech Republic
CityPrague
Period7/07/1411/07/14

Fingerprint Dive into the research topics of '3D core thermal hydraulics with the PORFLO code: Turbulence modelling and porous medium with porosity steps'. Together they form a unique fingerprint.

  • Cite this

    Ilvonen, M., Hovi, V., & Taivassalo, V. (2014). 3D core thermal hydraulics with the PORFLO code: Turbulence modelling and porous medium with porosity steps. In Proceedings of the 22th International Conference on Nuclear Engineering, ICONE22: Volume 4: Radiation Protection and Nuclear Technology Applications; Fuel Cycle, Radioactive Waste Management and Decommissioning; Computational Fluid Dynamics (CFD) and Coupled Codes; Reactor Physics and Transport Theory (Vol. 4). American Society of Mechanical Engineers ASME. https://doi.org/10.1115/ICONE22-30731