modeling: openfoam cfd modeling case study of a pool and

University of Massachusetts AmherstScholarWorks@UMass AmherstInternational Conference on Engineering andEcohydrology for Fish Passage

International Conference on Engineering andEcohydrology for Fish Passage 2016

Jun 21st, 2:15 PM - 2:30 PM

Modeling: OpenFOAM CFD Modeling CaseStudy of a Pool and Weir Fishway with Implicationsfor Free-Surface FlowsJason DuguayUniversité de Sherbrooke

Jay LaceyUniversité de Sherbrooke

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Duguay, Jason and Lacey, Jay, "Modeling: OpenFOAM CFD Modeling Case Study of a Pool and Weir Fishway with Implications forFree-Surface Flows" (2016). International Conference on Engineering and Ecohydrology for Fish Passage. 44.https://scholarworks.umass.edu/fishpassage_conference/2016/June21/44

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OpenFOAM CFD modeling case study of a pool and weir fishway with implications for free-surface flows

OpenFOAM fishway - Jason Duguay

1

Jason Duguay, PhD candidate

Jay Lacey, professor

Department of Civil EngineeringUniversité de SherbrookeSherbrooke, Québec

6/13/2016

Project and Objectives

• Verify interFoam solver with experimental data within a large pool and weir fishway

• Compare OpenFOAM to FLOW-3D

• Improve boundary conditions in OpenFOAM for free surface applications

OpenFOAM fishway - Jason Duguay 36/13/2016

Why OpenFOAM?

OpenFOAM fishway - Jason Duguay 4

Blog.castsoftware.comOpen-sourced

No limits

FreeSuitelife.com

En.wikipedia.org

Fees

linkedin.com

Black box

Restrictions

psicoativo.com

6/13/2016

Commercial CFD

versus

The pool and weir fishway under study


www.google.ca/maps/

The fishway in numbers

• 100 meters long• 3 meters wide• 9.2% slope• 31 pools• 8.2 m elevation drop• 1-1.5 m3/s of flow through the fishway

6/13/2016

Study basin

Flow direction

Modeled geometry


Free surface modeling with OpenFOAM and FLOW-3D


OpenFOAM’s interFoam solver

• Finite Volume Method

• Model’s two immiscible, incompressible,isothermal fluids

• Volume of fluid (VOF) free surface tracking

•Turbulence modeled using uRANS equations

FLOW-3D

• Similar modelling approach to interFOAM

• However, models only structured cartesian meshes

• Applies boundary at free surface instead ofmodelling both fluids (can model both optionally)

Flow3d.com

En.wikipedia.org

6/13/2016

Comparison between models



Streamline comparisons

Comparison ADV: u-component


+

-

Comparison ADV - TKE


Free surface position


South wall North wall

S

N

6/13/2016


Specify w.s. as p_rgh=totalPressureU = zeroGradientAlpha = inletOutlet (lets only water in, but air out)

U = fixedValue(0 0 0)p_rgh= fixedFluxPressureAlpha=zeroGradient

Top patch

Bottom patch Uses: dams, weirs, rivers, sluice gates, fishway

Pros and cons of new method:

• Allows water surface levels to be adjusted with ease without complicating your blockMesh dict

• Permits water to “naturally” enter and leave tedomain

• Permits waves to naturally cross boundaries?

• Slightly influences natural entry and exit of flow near boundaries

Nevertheless, SHOULD WORK VERY WELL IF BOUNDARIES ARE FAR FROM ZONES OF INTEREST (most cases thankfully)

6/13/2016

Suggested set of boundary conditions


Conclusions

OpenFOAM’s interFoam solver:

• accurately predicts Umax, reasonably predicts velocity components and TKE

• accurately predicts w.s. level in pool

• compares well to widely used commercial software

• boundary condition set was found for application to many common problems

6/13/2016

Questions?

17

modeling: openfoam cfd modeling case study of a pool and

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