Case Study of an Application of a Computational Fluid Dynamics Model to the Forebay of the Dalles Dam, Oregon

Khan, Liaqat Ali; Wicklein, Edward; Rashid, Mizan; Ebner, Laurie L.; Richards, Natalie

doi:10.1061/(asce)0733-9429(2008)134:5(509)

Cited by 7 publications

(7 citation statements)

References 15 publications

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“…The model domain shown in Figure 4 extends approximately 2 km upstream from the face of the dam, sufficiently far that river inflow boundary condition would not influence the solution in the region of interest (FSC and turbine intakes). This distance was selected based on previous CFD modelling experiences described in Lai et al (2003) and Khan et al (2008). Within the model domain, width and bed elevation of the forebay vary from 250 to 500 m and from 125 to 215 m, respectively.…”

Section: Description Of Computational Meshmentioning

confidence: 99%

“…Plan views of the computational mesh consisting of approximately one million cells are shown in Figure 5. The mesh densities specified in various regions of the forebay were based on CFD modelling experiences described by Meselhe et al (2000), Lai et al (2003) and Khan et al (2008).…”

Section: Description Of Computational Meshmentioning

confidence: 99%

“…Therefore, additional details of the software are not presented in this paper. Several independent applications of the software (Khan et al, 2004(Khan et al, , 2008Khan, 2006) indicate that STAR-CD can accurately predict the 3D flow fields provided the computational grids are sufficiently refined. Roy et al (2006) present a practical application of the model in designing a 28.5 cms capacity FSC at the Upper Baker Dam.…”

Section: Cfd Modelling Softwarementioning

confidence: 99%

“…Most CFD modelling software packages, including STAR-CD, do not contain calibration parameters that can be adjusted to match field data, as demonstrated by Meselhe and Odgaard (1998), Meselhe et al (2000), Lai et al (2003), Khan (2006) and Khan et al (2004Khan et al ( , 2006Khan et al ( , 2008. Therefore, the objective of validating a CFD model is to show that the computational grid is sufficiently refined for simulating the flow field reasonably well.…”

Section: Validation Of the Modelmentioning

confidence: 99%

“…As the success of a juvenile fish collection facility depends on local flow conditions (Coutant and Whitney, 2000;Johnson et al, 2005;Katopodis, 2005), this paper presents a CFD model investigation of the forebay hydrodynamics of the Upper Baker River Dam. CFD models of the forebay of dams have been reported by Meselhe and Odgaard (1998), Meselhe et al (2000), Muste et al (2001), Lai et al (2003) and Khan et al (2008). These studies have focused on dams on the Columbia and Snake Rivers, where sluiceways, combined with partial screening of flows, are used for juvenile fish passages (Whitney et al, 1997;Coutant and Whitney, 2000;ISG, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Computational fluid dynamics modelling of forebay hydrodynamics created by a floating juvenile fish collection facility at the Upper Baker River Dam, Washington

Khan¹,

Roy²,

Rashid³

2008

River Research & Apps

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The Upper Baker River Dam utilizes a combination of a floating surface collector (FSC) and a guide net to facilitate the downstream migration of anadromous juvenile fish. The FSC generates attraction currents by withdrawing water from the forebay, upstream of the guide net. The withdrawn water is discharged at the rear of the FSC by two pumps. A three-dimensional (3D) computational fluid dynamics (CFD) model of the forebay of the dam is presented in this paper. The objective was to investigate forebay hydrodynamics generated by the FSC and operation of the powerhouse. The CFD model, consisting of approximately one million computational cells, was validated against field data. Model results were analyzed, using a recently proposed strain-velocity-pressure (SVP) hypothesis, to identify hydrodynamic cues responsible for attracting juvenile fish to the FSC. The CFD model indicates that the FSC pumps generated high velocity jets dominate the circulation pattern downstream of the guide net. Upstream of the guide net, the velocities are weak, except in the region impacted by attraction currents. The sweeping and normal velocities on the guide net are smaller than those suggested by regulatory agencies for designing screens at juvenile fish collection facilities.

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Section: Description Of Computational Meshmentioning

confidence: 99%