Effect of Downstream Channel Slope on Numerical Modeling of Dam Break Induced Flows

2016-07-29
Dinçer, Ali Ersin
Bozkuş, Zafer
Şahin, Ahmet Nazım
Show full item record
135
views
0
downloads
In the present study, the numerical simulations of dam break induced flows are performed by using various models. The numerical models used in the study are laminar, large eddy simulation (LES) and Reynolds-Averaged Navier Stokes (RANS) equations with k-ε turbulence model. In addition a recently developed Smoothed Particle Hydrodynamics (SPH) code is also used to simulate dam break problem. For the validation of the numerical approaches, a recently published experimental study is used. In the experimental study, an idealized dam break problem in a sloped channel is investigated. It is found that although other numerical approaches give similar velocity profiles with the experiments, RANS equations with k-ε turbulence model gives underestimated results. The same problem is simulated by assuming that the downstream channel is not inclined, i.e. horizontal. It is observed that when the channel is not inclined, k-ε turbulence model gives closer results to other numerical models. Therefore, it can be concluded that for dam break induced flows, slope of the channel may adversely affect the accuracy of k-ε turbulence model. However, more experimental and numerical data is needed to validate this conclusion. © 2016 Taylor & Francis Group, London.
Dambreak, K-ε turbulence model, Laminar flow, Large Eddy simulation, Les, Turbulence modelling
https://hdl.handle.net/11511/82380
https://www.scopus.com/record/display.uri?eid=2-s2.0-85015073902&origin
Effect of Downstream Channel Slope on Numerical Modeling of Dam Break Induced Flows, 4th IAHR Europe Congress, 27 - 29 Temmuz 2016
Department of Civil Engineering, Conference / Seminar

Suggestions

Implementation and comparison of turbulence models on a flat plate problem using a Navier-Stokes solver
Genç, Balkan Ziya; Aksel, Mehmet Haluk; Department of Mechanical Engineering (2003)
For turbulent flow calculations, some of the well-known turbulence models in the literature are applied on a previously developed Navier-Stokes solver designed to handle laminar flows. A finite volume formulation, which is cell-based for inviscid terms and cell-vertex for viscous terms, is used for numerical discretization of the Navier-Stokes equations in conservative form. This formulation is combined with one-step, explicit time marching Lax-Wendroff numerical scheme that is second order accurate in spac...
Effect of Flow Rate Controllers and their Opening Levels on Liquid Steel Flow in Continuous Casting Mold
Gursoy, Kadir Ali; Yavuz, Mehmet Metin (2016-01-01)
The present study investigates the mold flow structure at constant throughput condition for different slide-gate and stopper rod openings by utilizing computational fluid dynamic (CFD) modeling. Detailed validation of the CFD models are conducted using available experimental data and the performances of three different turbulence models, standard k-epsilon, realizable k-epsilon and k-omega SST are compared. The constant throughput casting operations for different slide-gate and stopper rod controller openin...
AN IMPROVED 1D MODEL FOR LIQUID SLUGS TRAVELLING IN PIPELINES
Tijsseling, Arris S.; Hou, Qingzhi; Bozkuş, Zafer (2014-07-24)
An improved one-dimensional (1D) model - compared to previous work by the authors - is proposed which is able to predict the acceleration and shortening of a single liquid slug propagating in a straight pipe with a downstream bend. The model includes holdup at the slug's tail and flow separation at the bend. The obtained analytical and numerical results are validated against experimental data. The effects of the improvement and of holdup are examined in a parameter variation study.
Effect of fan and shroud configurations on underhood flow characteristics of an agricultural tractor
Ozturk, Ilhan; Cetin, Cenk; Yavuz, Mehmet Metin (Informa UK Limited, 2019-01-01)
In the current study, effects of two different underhood geometry modifications namely; fan position relative to shroud and fan tip clearance, on airflow through an agricultural tractor engine cooling system are investigated by utilizing CFD modeling. For the characterization of each modification, the underhood components are reduced to a domain of cooling systems including only fan, shroud, and radiator that allows saving in computational time and cost. The models are validated using a custom designed unde...
Effect of cyclic thermal loading on the performance of steel H-piles in integral bridges with stub-abutments
Dicleli, Murat (Elsevier BV, 2004-02-01)
In this paper, analytical equations are developed to estimate the lateral displacement capacity of steel-H piles in integral bridges with stub abutments subjected to cyclic thermal variations. First, steel H piles that are capable of sustaining large plastic deformations are identified based on their local buckling strength. The normalized moment-curvature relationships of these piles are then obtained for various axial load levels. Next, a low-cycle fatigue damage model is employed to determine the maximum...
Citation Formats
A. E. Dinçer, Z. Bozkuş, and A. N. Şahin, “Effect of Downstream Channel Slope on Numerical Modeling of Dam Break Induced Flows,” presented at the Effect of Downstream Channel Slope on Numerical Modeling of Dam Break Induced Flows, 4th IAHR Europe Congress, 27 - 29 Temmuz 2016, Liege, Belgium, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/82380.
METU IIS - Integrated Information Service open@metu.edu.tr