1 / 31

B. Noël, Soares S., Y. Zech Université catholique de Louvain

WP3 : Flood Propagation Computation On The ‘Isolated Building Test Case’ And The ‘ Model City Flooding Experiment ’. B. Noël, Soares S., Y. Zech Université catholique de Louvain. Overview. Numerical Model The ‘Isolated Building Benchmark’ Numerical modelling Numerical results

makala
Download Presentation

B. Noël, Soares S., Y. Zech Université catholique de Louvain

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. WP3 : Flood PropagationComputation On The ‘Isolated Building Test Case’ And The ‘Model City Flooding Experiment ’ B. Noël, Soares S., Y. Zech Université catholique de Louvain

  2. Overview • Numerical Model • The ‘Isolated Building Benchmark’ • Numerical modelling • Numerical results • Sensitivity analysis • The ‘Model City Benchmark’ • Numerical modelling • Numerical results • Sensitivity analysis

  3. Overview • Numerical Model • The ‘Isolated Building Benchmark’ • Numerical modelling • Numerical results • Sensitivity analysis • The ‘Model City Benchmark’ • Numerical modelling • Numerical results • Sensitivity analysis

  4. Numerical Model • 2D finite-volume method • First-order scheme • Flux evaluated by Roe’s scheme • Non-Cartesian grids allowed ‘Soares Frazão S., 2002 PHD Thesis ’

  5. Overview • Numerical Model • The ‘Isolated Building Benchmark’ • Numerical modelling • Numerical results • Sensitivity analysis • The ‘Model City Benchmark’ • Numerical modelling • Numerical results • Sensitivity analysis

  6. Square meshes Quadrangular meshes The ‘Isolated Building Benchmark’ • Numerical modelling (2-mesh grid) • Grid :

  7. The ‘Isolated Building Benchmark’ • Numerical modelling • Building neighbouring

  8. The ‘Isolated Building Benchmark’ • Numerical modelling • Grid mean size : 5 x 5 cm • CFL number : 0.9 • Time duration : ± 2 h • CPU : AMD XP1800+ (128Mb)

  9. The ‘Isolated Building Benchmark’ • Numerical results

  10. The ‘Isolated Building Benchmark’ • Numerical results • Water level :

  11. The ‘Isolated Building Benchmark’ • Numerical results • Water level (t = 10 s) :

  12. The ‘Isolated Building Benchmark’ • Numerical results • Velocity field (t = 5 s) : Numerical Experimental Noël, Spinewine 2003 - UCL

  13. The ‘Isolated Building Benchmark’ • Numerical results • Velocity Intensity (t = 5 s) : Numerical Experimental Noël, Spinewine 2003 - UCL

  14. The ‘Isolated Building Benchmark’ • Sensitivity analysis • Manning roughness coefficient

  15. The ‘Isolated Building Benchmark’ • Sensitivity analysis • Initial downstream water-depth

  16. Overview • Numerical Model • The ‘Isolated Building Benchmark’ • Numerical modelling • Numerical results • Sensitivity analysis • The ‘Model City Benchmark’ • Numerical modelling • Numerical results • Sensitivity analysis

  17. The ‘Model City Benchmark’ • Numerical modelling (channelled) Mesh XXX

  18. The ‘Model City Benchmark’ • Numerical modelling (10-mesh grid) Mesh XXX

  19. The ‘Model City Benchmark’ • Numerical modelling (original) Mesh XXX

  20. The ‘Model City Benchmark’ • Numerical modelling (10-mesh grid)

  21. The ‘Model City Benchmark’ • Numerical modelling • Topography reconstruction

  22. The ‘Model City Benchmark’ • Numerical modelling • Upstream reservoir • Dimensions : unknown but seen on picture  about 1 meter of longitudinal length  lateral bed level similar to the bed level of upstream end of channel • Best way to model : decrease bed level of feeding tank and fill it with water at rest  numerical crash at corner of reservoir

  23. Walls Inlet Walls The ‘Model City Benchmark’ • Numerical modelling • Upstream reservoir • bed level of the upstream end of channel • Inlet introduced at the upstream end of the prolonged channel

  24. The ‘Model City Benchmark’ • Numerical modelling • Grid mean size : 2.5 x 2.5 cm • CFL number : 0.1 • Time duration : ± 5h. • Computer : AMD XP1800+ (128Mb)

  25. The ‘Model City Benchmark’ • Numerical results • Test cases 1a & 1b (t = 20 s) : Staggered layer : - velocity decreased - water level increased in the building layer

  26. The ‘Model City Benchmark’ • Numerical results • Test cases 2a & 2b (t = 20 s) : Staggered layer : - velocity decreased - water level increased in the building layer

  27. The ‘Model City Benchmark’ • Numerical results • Test cases 3a & 3b (t = 20 s) : Low inflow : 60 l/s High inflow : 100 l/s

  28. The ‘Model City Benchmark’ • Numerical results • Test cases 4a & 4b (t = 20 s) : Buildings as bed elevation (15 cm):

  29. The ‘Model City Benchmark’ • Numerical results • Test cases 4a & 4c (t = 20 s) : High friction (n = 10 s/m1/3): - water lost in buildings - maximum water level moves downstream and is a few decreased

  30. The ‘Model City Benchmark’ • Sensitivity analysis • Downstream boundary condition

  31. WP3 : Flood PropagationComputation On The ‘Isolated Building Test Case’ And The ‘Model City Flooding Experiment ’ B. Noël, Soares S., Y. Zech Université catholique de Louvain

More Related