WP3 : Flood Propagation
This presentation is the property of its rightful owner.
Sponsored Links
1 / 31

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


  • 91 Views
  • Uploaded on
  • Presentation posted in: General

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

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


Overview

  • Numerical Model

  • The ‘Isolated Building Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis

  • The ‘Model City Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis


Overview

  • Numerical Model

  • The ‘Isolated Building Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis

  • The ‘Model City Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis


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 ’


Overview

  • Numerical Model

  • The ‘Isolated Building Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis

  • The ‘Model City Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis


Square meshes

Quadrangular meshes

The ‘Isolated Building Benchmark’

  • Numerical modelling (2-mesh grid)

    • Grid :


The ‘Isolated Building Benchmark’

  • Numerical modelling

    • Building neighbouring


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)


The ‘Isolated Building Benchmark’

  • Numerical results


The ‘Isolated Building Benchmark’

  • Numerical results

    • Water level :


The ‘Isolated Building Benchmark’

  • Numerical results

    • Water level (t = 10 s) :


The ‘Isolated Building Benchmark’

  • Numerical results

    • Velocity field (t = 5 s) :

Numerical

Experimental

Noël, Spinewine 2003 - UCL


The ‘Isolated Building Benchmark’

  • Numerical results

    • Velocity Intensity (t = 5 s) :

Numerical

Experimental

Noël, Spinewine 2003 - UCL


The ‘Isolated Building Benchmark’

  • Sensitivity analysis

    • Manning roughness coefficient


The ‘Isolated Building Benchmark’

  • Sensitivity analysis

    • Initial downstream water-depth


Overview

  • Numerical Model

  • The ‘Isolated Building Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis

  • The ‘Model City Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis


The ‘Model City Benchmark’

  • Numerical modelling (channelled)

    Mesh XXX


The ‘Model City Benchmark’

  • Numerical modelling (10-mesh grid)

    Mesh XXX


The ‘Model City Benchmark’

  • Numerical modelling (original)

    Mesh XXX


The ‘Model City Benchmark’

  • Numerical modelling (10-mesh grid)


The ‘Model City Benchmark’

  • Numerical modelling

    • Topography reconstruction


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


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


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)


The ‘Model City Benchmark’

  • Numerical results

    • Test cases 1a & 1b (t = 20 s) :

      Staggered layer :

      - velocity decreased

      - water level increased in the building layer


The ‘Model City Benchmark’

  • Numerical results

    • Test cases 2a & 2b (t = 20 s) :

      Staggered layer :

      - velocity decreased

      - water level increased in the building layer


The ‘Model City Benchmark’

  • Numerical results

    • Test cases 3a & 3b (t = 20 s) :

      Low inflow :

      60 l/s

      High inflow :

      100 l/s


The ‘Model City Benchmark’

  • Numerical results

    • Test cases 4a & 4b (t = 20 s) :

      Buildings as bed elevation (15 cm):


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


The ‘Model City Benchmark’

  • Sensitivity analysis

    • Downstream boundary condition


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


  • Login