Refine
Year of publication
- 2023 (3)
- 2022 (6)
- 2021 (10)
- 2020 (7)
- 2019 (8)
- 2018 (8)
- 2017 (7)
- 2016 (13)
- 2015 (10)
- 2014 (4)
- 2013 (9)
- 2012 (9)
- 2011 (5)
- 2010 (11)
- 2009 (6)
- 2008 (5)
- 2007 (4)
- 2006 (3)
- 2004 (2)
- 2003 (4)
- 2002 (1)
- 1999 (4)
- 1998 (1)
- 1997 (1)
- 1995 (1)
- 1994 (2)
- 1993 (4)
- 1992 (3)
- 1990 (1)
- 1989 (1)
- 1988 (1)
- 1987 (1)
- 1985 (1)
- 1984 (1)
Institute
- Fachbereich Bauingenieurwesen (157) (remove)
Language
- English (157) (remove)
Document Type
- Conference Proceeding (75)
- Article (69)
- Report (6)
- Part of a Book (4)
- Book (1)
- Conference Poster (1)
- Habilitation (1)
Keywords
- metal structure (4)
- steel (4)
- industrial research (3)
- iron and steel industry (3)
- materials technology (3)
- research report (3)
- building industry (2)
- building information modelling (2)
- building materials (2)
- energy efficiency (2)
- research project (2)
- resistance of materials (2)
- 20 fossil-fueled power plants (1)
- 3D printing (1)
- Algal Turf Scrubber (1)
- Algal–bacterial bioflm (1)
- Anammox (1)
- BIM (1)
- Biogas (1)
- Circular bioeconomy (1)
- Energy system (1)
- Freshmen (1)
- HVAC (1)
- Hazard assessment (1)
- Hydraulic structures (1)
- Landslide tsunamis (1)
- Large scale tests (1)
- Mainstream (1)
- Methane (1)
- Mixed integer linear programming (MILP) (1)
- Nitrogen removal (1)
- Open channels (1)
- Overland flow (1)
- PIV (1)
- Partial nitritation (1)
- Physical modeling (1)
- Proper Orthogonal Decomposition (1)
- Q-criterion (1)
- Renewable energy (1)
- Sharing mobility (1)
- Similitude (1)
- Smart Building Engineering (1)
- Solitary waves (1)
- Time-series aggregation (1)
- Typical periods (1)
- VOF (1)
- Wastewater (1)
- anammox (1)
- building safety (1)
- building technique (1)
- business models (1)
- ceramics (1)
- coherent structures (1)
- construction (1)
- dam-break (1)
- designs and models (1)
- drag force (1)
- electro mobility (1)
- emote practical training (1)
- energy disspation (1)
- filtration (1)
- food production (1)
- friction (1)
- gas flow (1)
- guide (1)
- hot gas cleanup (1)
- hydraulic modelling (1)
- ingot (1)
- lockdown conditions (1)
- mainstream deammonification (1)
- mobility behaviour (1)
- model performance (1)
- nitrogen elimination (1)
- numerical model (1)
- physical model (1)
- prefabrication (1)
- remote teamwork (1)
- renewable energy (1)
- roleplay (1)
- small and medium scaled companies (1)
- smart building engineering (1)
- smart engineering (1)
- sustainability (1)
- testing (1)
- thermal insulation (1)
- urban farming (1)
- virtual reality (1)
- wastewater (1)
- wave run-up (1)
The replacement of existing spillway crests or gates with labyrinth weirs is a proven techno-economical means to increase the discharge capacity when rehabilitating existing structures. However, additional information is needed regarding energy dissipation of such weirs, since due to the folded weir crest, a three-dimensional flow field is generated, yielding more complex overflow and energy dissipation processes. In this study, CFD simulations of labyrinth weirs were conducted 1) to analyze the discharge coefficients for different discharges to compare the Cd values to literature data and 2) to analyze and improve energy dissipation downstream of the structure. All tests were performed for a structure at laboratory scale with a height of approx. P = 30.5 cm, a ratio of the total crest length to the total width of 4.7, a sidewall angle of 10° and a quarter-round weir crest shape. Tested headwater ratios were 0.089 ≤ HT/P ≤ 0.817. For numerical simulations, FLOW-3D Hydro was employed, solving the RANS equations with use of finite-volume method and RNG k-ε turbulence closure. In terms of discharge capacity, results were compared to data from physical model tests performed at the Utah Water Research Laboratory (Utah State University), emphasizing higher discharge coefficients from CFD than from the physical model. For upstream heads, some discrepancy in the range of ± 1 cm between literature, CFD and physical model tests was identified with a discussion regarding differences included in the manuscript. For downstream energy dissipation, variable tailwater depths were considered to analyze the formation and sweep-out of a hydraulic jump. It was found that even for high discharges, relatively low downstream Froude numbers were obtained due to high energy dissipation involved by the three-dimensional flow between the sidewalls. The effects of some additional energy dissipation devices, e.g. baffle blocks or end sills, were also analyzed. End sills were found to be non-effective. However, baffle blocks with different locations may improve energy dissipation downstream of labyrinth weirs.