Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Brains versus Brawn: The Changing Wolrd of Hydraulic Model Studies
As existing dams are scrutinized against evolving criteria, flood flows are often updated, leading to spillway expansion. Reservoir expansion may also require modification of spillways. These situations can require that a spillway be re-evaluated to determine performance expectations under different flow conditions. To evaluate new or modified designs, engineers currently have the choice of interpolating/extrapolating from published data or completing a physical model study. As computing power increases and Computational Fluid Dynamics (CFD) algorithms continue to improve, new design tools are evolving to evaluate rapidly varied flow situations. Spillways, especially complex spillways such as labyrinths, present a key area that may benefit from the use of CFD. However, CFD for spillway applications needs to be further evaluated and validated. A labyrinth spillway is one of the more efficient shapes for passing flood flows. However, moderate geometric changes can significantly affect discharge characteristics. The prototype labyrinth spillway used as a basis for discussion was designed by Schnabel Engineering Association. The existing labyrinth spillway has a height of 15 ft and a W/P ratio of 2.0. To accommodate expansion of dam storage, the spillway had to be redesigned with a height of 25 ft and a W/P ratio of 1.2. This ratio is well below the standard design of W/P 3 2.0. The design was evaluated through a physical model study, performed at the US Bureau of Reclamations Water Resources Research Laboratory. The model results raised some questions concerning accepted theories for the H/P parameter for labyrinth design. In addition, the new design was evaluated using CFD, through a commercially available Reynolds-averaged Navier- Stokes numerical model (FLOW-3DO). This paper compares and evaluates the CFD, current accepted theory and the physical model results. This allows a comparison for the use of CFD as a cost effective alternative to physical models.
Brains versus Brawn: The Changing Wolrd of Hydraulic Model Studies
As existing dams are scrutinized against evolving criteria, flood flows are often updated, leading to spillway expansion. Reservoir expansion may also require modification of spillways. These situations can require that a spillway be re-evaluated to determine performance expectations under different flow conditions. To evaluate new or modified designs, engineers currently have the choice of interpolating/extrapolating from published data or completing a physical model study. As computing power increases and Computational Fluid Dynamics (CFD) algorithms continue to improve, new design tools are evolving to evaluate rapidly varied flow situations. Spillways, especially complex spillways such as labyrinths, present a key area that may benefit from the use of CFD. However, CFD for spillway applications needs to be further evaluated and validated. A labyrinth spillway is one of the more efficient shapes for passing flood flows. However, moderate geometric changes can significantly affect discharge characteristics. The prototype labyrinth spillway used as a basis for discussion was designed by Schnabel Engineering Association. The existing labyrinth spillway has a height of 15 ft and a W/P ratio of 2.0. To accommodate expansion of dam storage, the spillway had to be redesigned with a height of 25 ft and a W/P ratio of 1.2. This ratio is well below the standard design of W/P 3 2.0. The design was evaluated through a physical model study, performed at the US Bureau of Reclamations Water Resources Research Laboratory. The model results raised some questions concerning accepted theories for the H/P parameter for labyrinth design. In addition, the new design was evaluated using CFD, through a commercially available Reynolds-averaged Navier- Stokes numerical model (FLOW-3DO). This paper compares and evaluates the CFD, current accepted theory and the physical model results. This allows a comparison for the use of CFD as a cost effective alternative to physical models.
Brains versus Brawn: The Changing Wolrd of Hydraulic Model Studies
B. Savage (Autor:in) / K. Frizell (Autor:in) / J. Crowder (Autor:in)
2010
15 pages
Report
Keine Angabe
Englisch
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