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Numerical Study of Erosion-proof of Loose Sand in an Overtopped Plunging Scour Process– FLOW3D. Investigators: Ge Wang, Chung R. Song, Jinwon Kim and Alexander, H.-D. Cheng Civil Engineering Department University of Mississippi. Objectives.

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numerical study of erosion proof of loose sand in an overtopped plunging scour process flow3d

Numerical Study of Erosion-proof of Loose Sand in an Overtopped Plunging Scour Process– FLOW3D

Investigators: Ge Wang, Chung R. Song, Jinwon Kim and Alexander, H.-D. Cheng

Civil Engineering Department

University of Mississippi

objectives
Objectives

Failure of floodwalls during Hurricane Katrina, August 23, 2005. Nearly every levee in metro New Orleans was breached. Eventually 80% of the city became flooded .

Scouring caused by overtopping flow. This leads to hydrostatic pressure exceeding the designed load that gives rise to failure of Floodwall system.

Main goal: investigate levee back side erosion caused by overtopping, and ultimately provide improved technologies for the retrofitting and construction of the nation’s hurricane and flood protection system.

1 flow3d for a scour erosion study
1. FLOW3D for a scour/erosion study
  • Predict the behavior of packed/suspended sediment with one fluid mode.
  • 3 dimensional prognostic solver.
  • Contain a variety of optional turbulent models.
  • Actual conditions are easily to apply.
slide4
(cont.)
  • Model at a Glance

Fluid field

drag coeff.

slide5
(cont.)

Movement of suspended sediment

: local lifting, drifting velocity.

: local concentration.

: diffusion coefficient.

slide6
(cont.)
  • Input parameters for an erosion simulation
    • Average particle diameter: 0.071 cm
    • Density of the sediment particles: 2.67
    • Critical shields number: 0.00043
    • Critical sediment fraction
    • Cohesive sediment fraction
    • Sediment drag factor
    • Angle of repose:
slide12
(cont.)

(A)

(B)

(C)

(D)

slide14
(cont.)

Case B

Case A

Case D

Case C

3 conclusions
3. Conclusions
  • FLOW3D’s sediment scour model is a straightforward approach to modeling erosion and deposition of sediment for fully three-dimensional flows.
  • Predictions show the scoured domain in agreement with the observations.
  • Invalid for cohesive material erosion problems.
slide16

4.Grant Acknowledgement

Department of Homeland Security-through Southeast Region Research Initiative

(SERRI), USA.

Thanks a lot for your attention!

Any questions?