1 / 18

Channel flow benchmarks

Channel flow benchmarks. DNS datasets to validate Code_Saturne Effect of complex grids  hexa, non-conform, tetra Low Reynolds number tests Ret = 100 no turbulence model Ret = 395 tests subgrid scale model tests Towards high Reynolds numbers subgrid scale models at high Reynolds numbers.

fern
Download Presentation

Channel flow benchmarks

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. Channel flow benchmarks • DNS datasets to validate Code_Saturne • Effect of complex grids •  hexa, non-conform, tetra • Low Reynolds number tests Ret = 100 • no turbulence model • Ret = 395 tests • subgrid scale model tests • Towards high Reynolds numbers • subgrid scale models at high Reynolds numbers

  2. Channel flow benchmarks: « classic » DNS • DNS Ret = 180 • Box 4 x 2 x 2, Grid 192 x 128 x 160 (4M cells) •  Same grid as Mansour, Kim & Moin • Results include • velocity, shear and normal stresses (<u>, <u’v’> etc… ) • Triple correlations (<v’u’u’> etc…) • Terms in turbulent kinetic energy budget • Terms in the components of each budget

  3. Channel flow benchmarks: DNS Ret =180 • • Grid adapted for a spectral code • • but applied to a non spectral code

  4. Channel flow benchmarks: DNS Ret =180 • • Grid adapted for a spectral code • • but applied to a non spectral code

  5. Channel flow benchmarks: DNS Ret =180 • • Grid adapted for a spectral code • • but applied to a non spectral code

  6. Channel flow benchmarks: DNS Ret =180

  7. Channel flow benchmarks: DNS Ret =180

  8. Channel flow benchmarks: DNS Ret =180

  9. Channel flow benchmarks: Code_Saturnetest grids Hexahedral Non-conform (hexa) Box 2 x 2 x  440,000 elements Tetrahedral

  10. Channel flow benchmarks: Ret = 100 • DNS 880k cells •  for same box size • tests 440k cells • Tetra • poorly resolved • difference in grid on each wall • Hexa • too coarse at wall

  11. Channel flow benchmarks: Ret = 100 • turbulence kinetic energy • weaknesses of each case become more clear

  12. Channel flow benchmarks: Ret = 395 • velocity

  13. Channel flow benchmarks: Ret = 395 • shear stress

  14. Channel flow benchmarks: Ret = 395 • normal stresses

  15. Channel flow benchmarks: Ret = 395 • tke

  16. Channel flow benchmarks: high Reynolds numbers • Box 6 x 2 x2, Grid 11 x 11 x 11 (1.3k cells)

  17. Thermal radiation Detail of the tubes that make up a bundle inside a SFR reactor ·Ensure the tubes don’t touch, Ensure that sodium cannot get trapped (particularly important with respect to the neutronic reactions), ·Reduce vibrations within the tube bundle, Improve the mixing near the heater and increase the rate of heat exchange.

  18. A z=100mm A z=140mm First attempts to simulate the fluid

More Related