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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

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

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  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

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