1 / 11

KNOO Annual Meeting 2008

KNOO Annual Meeting 2008. LES and URANS of Turbulent Flow parallel to PWR and AGR Fuel Rod Bundles S. Rolfo The University of Manchester, M60 1QD, UK School of Mechanical, Aerospace & Civil Engineering. CFD group. The University of Manchester. RNR-Na assembly (Super Phoenix Reactor).

azalia-lawrence
Download Presentation

KNOO Annual Meeting 2008

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 1 KNOO Annual Meeting 2008 • LES and URANS of Turbulent Flow parallel to PWR and AGR Fuel Rod • Bundles • S. Rolfo • The University of Manchester, M60 1QD, UK • School of Mechanical, Aerospace & Civil Engineering. • CFD group The University of Manchester

  2. 2 RNR-Na assembly (Super Phoenix Reactor).

  3. 3 Scales separation and levels of approximation. Scales separation and levels of approximation. Fixed point at which the FFT is evaluated DNS LES RANS

  4. 4 Code_Saturne • Code developed by EdF and now open source downloadable from:http://rd.edf.com/the-edf-offers/research-and-development/softwares/code-saturne-107008.html • Unstructured • Co-located, Finite Volume Formulation • Different turbulent models (both RANS and LES) • Incompressible or expandable flows with or without heat transfer • Different modules: radiative heat transfer, combustion, magneto-hydrodynamics, compressible flows, two-phase flows • Possible coupling with Code_Aster for structural analysis and with Syrthes for thermal analysis. • Parallel code coupling capabilities (awarded the Gold medal on HPCx)‏

  5. 5 Rod Bundle arranged in a triangular array • Two different geometrical configuration • P/D = 1.06 • P/D = 1.15 • Three different Thermal Hydraulic regimes: • P/D = 1.06 @ Re = 6000 with heat transfer (LES)‏ • P/D = 1.06 @ Re = 36000 with heat transfer (RSM-URANS)‏ • P/D = 1.15 @ Re = 6000 with heat transfer (LES)‏ A’ A

  6. 6 Flow Pulsation in the mid-plane (P/D = 1.06)‏ LES @ Re = 6000 URANS @ Re = 39000

  7. Flow Pulsation in the mid-plane (P/D = 1.06)‏ LES URANS 7

  8. 8 Power spectra Point A Point B P/D =1.06 LES @ Re = 6000 P/D =1.06 URANS @ Re = 36000 Point A P/D =1.15 LES @ Re = 6000 Point B

  9. 9 Average Field (LES P/D = 1.06 Re = 6000) <T> <U>

  10. 10 Reynolds Stress <uu> <uv> <vv> <uw> <ww> <vw>

  11. 11 Conclusions and future work • Flow Fluctuations in the mid plane of the geometry were successfully detected for the configuration characterised by P/D = 1.06. However P/D = 1.15 did not show any significant behaviour from channel or pipe flows. • URANS is able to capture the flow fluctuations, however the Reynolds stresses are more similar to those observed at higher P/D. • LES, at low Re number, of larger geometry (two complete sub-channels) to be tested in order to verify the correct prediction of the dominant frequency. • Improved geometry with the addition of a wire, wrapped around the pin (SFR assembly), will be computed. Acknowledgements This work was carried out as part of the TSEC programme KNOO and as such we are grateful to the EPSRC for funding under grant EP/C549465/1.

More Related