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


  • 85 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


B no l soares s y zech universit catholique de louvain

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

Overview

  • Numerical Model

  • The ‘Isolated Building Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis

  • The ‘Model City Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis


Overview1

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

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 ’


Overview2

Overview

  • Numerical Model

  • The ‘Isolated Building Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis

  • The ‘Model City Benchmark’

    • Numerical modelling

    • Numerical results

    • Sensitivity analysis


The isolated building benchmark

Square meshes

Quadrangular meshes

The ‘Isolated Building Benchmark’

  • Numerical modelling (2-mesh grid)

    • Grid :


The isolated building benchmark1

The ‘Isolated Building Benchmark’

  • Numerical modelling

    • Building neighbouring


The isolated building benchmark2

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 benchmark3

The ‘Isolated Building Benchmark’

  • Numerical results


The isolated building benchmark4

The ‘Isolated Building Benchmark’

  • Numerical results

    • Water level :


The isolated building benchmark5

The ‘Isolated Building Benchmark’

  • Numerical results

    • Water level (t = 10 s) :


The isolated building benchmark6

The ‘Isolated Building Benchmark’

  • Numerical results

    • Velocity field (t = 5 s) :

Numerical

Experimental

Noël, Spinewine 2003 - UCL


The isolated building benchmark7

The ‘Isolated Building Benchmark’

  • Numerical results

    • Velocity Intensity (t = 5 s) :

Numerical

Experimental

Noël, Spinewine 2003 - UCL


The isolated building benchmark8

The ‘Isolated Building Benchmark’

  • Sensitivity analysis

    • Manning roughness coefficient


The isolated building benchmark9

The ‘Isolated Building Benchmark’

  • Sensitivity analysis

    • Initial downstream water-depth


Overview3

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

The ‘Model City Benchmark’

  • Numerical modelling (channelled)

    Mesh XXX


The model city benchmark1

The ‘Model City Benchmark’

  • Numerical modelling (10-mesh grid)

    Mesh XXX


The model city benchmark2

The ‘Model City Benchmark’

  • Numerical modelling (original)

    Mesh XXX


The model city benchmark3

The ‘Model City Benchmark’

  • Numerical modelling (10-mesh grid)


The model city benchmark4

The ‘Model City Benchmark’

  • Numerical modelling

    • Topography reconstruction


The model city benchmark5

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


The model city benchmark6

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 benchmark7

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 benchmark8

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 benchmark9

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 benchmark10

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 benchmark11

The ‘Model City Benchmark’

  • Numerical results

    • Test cases 4a & 4b (t = 20 s) :

      Buildings as bed elevation (15 cm):


The model city benchmark12

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 benchmark13

The ‘Model City Benchmark’

  • Sensitivity analysis

    • Downstream boundary condition


B no l soares s y zech universit catholique de louvain

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