2015 [ to top ]

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  Ruopp, A., Daus, P., Biskup, F., Riedelbauch, S.: Performance prediction of a tidal in-stream current energy converter and site assessment next to Jindo, South Korea. Journal of Renewable and Sustainable Energy. 7, (2015).
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  Ruopp, A., Daus, P.: Simulation von Gezeitenströmungen zur Standortanalyse und Bestimmung vorhandener Potenziale. Wasserkraftprojekte Band II. S. 84--89. Wasserkraftprojekte Band II (2015).
   

2014 [ to top ]

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  Ruopp, A., Ruprecht, A., Riedelbauch, S., Arnaud, G., Hamad, I.: Development of a hydro kinetic river turbine with simulation and operational measurement results in comparison. IOP Conference Series: Earth and Environmental Science. 22, 062002 (2014).
  [ Abstract ] [ URL ]
   
  The development of a hydro-kinetic prototype was shown including the compound structure, guide vanes, runner blades and a draft tube section with a steeply sloping, short spoiler. The design process of the hydrodynamic layout was split into three major steps. First the compound and the draft tube section was designed and the best operating point was identified using porous media as replacement for the guide vane and runner section (step one). The best operating point and the volume flux as well as the pressure drop was identified and used for the design of the guide vane section and the runner section. Both were designed and simulated independently (step two). In step three, all parts were merged in stationary simulation runs detecting peak power and operational bandwidth. In addition, the full scale demonstrator was installed in August 2010 and measured in the St. Lawrence River in Quebec supporting the average inflow velocity using ADCP (Acoustic Doppler Current Profiler) and the generator power output over the variable rotational speed. Simulation data and measurements are in good agreement. Thus, the presented approach is a suitable way in designing a hydro kinetic turbine.
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  Daus, P., Ruopp, A., Biskup, F., Arlitt, R.: Performance prediction of a tidal in-stream current energy converter. 3rd IAHR Europe Congress, Book of Proceedings, 2014, Porto -Portugal. 3rd IAHR Europe Congress, Book of Proceedings, 2014, Porto -Portugal (2014).
  [ Abstract ]
   
  The magnitude of energy, which is extracted by tidal energy converter devices, has a significant impact on the commercial viability of an entire project. Therefore a substantialcharacterization of the tidal current at the location of interest and subsequently a confident prediction of the electricity production of the tidal energy converter at an early stage of the project is of high interest. This paper deals with a method to estimate the production of a single device using results from a 2D shallow water equation model combined with turbine performance curves and its validation by performance data from operations of the Voith prototype HyTide 110-5.3 under real conditions in Jindo, South Korea. A recently developed 2D shallow water equation solver based on OpenFOAM (tidalFoam) is used to accurately simulate the tidal current around the installation location of the device.High-resolved bathymetry data, shorelines and tidal elevation at the open boundaries of the unstructured mesh is used to set up the model. The bottom friction as an additional implicit source term in the model is used to calibrate the simulation against Acoustic Doppler Current Profiler (ADCP) measurements at site. The expected electricity production is compared with actual field measurements during the operation of the Voith scaled demonstrator. The complete analysis and results gives valuable and significant confidence in the performance expectation of the single tidal turbine. The results show that the production of single devices can be accurately estimated. This grants an important first input to commercial evaluations of future tidal energy projects.

2013 [ to top ]

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  Ruopp, A., Daus, P., Ruprecht, A., Riedelbauch, S.: A Two-Dimensional Finite Volume Shallow Water Model for Tidal Current Simulations Using OpenFOAM\textsuperscripttextregistered - Numerical Validation and High-Resolution Ocean Modelling Case. EWTEC, Aalbourg, Denmark. S. 10. 10th European Wave and Tidal Energy Conference (EWTEC), Aalborg, Denmark (2013).
   
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  Ruopp, A., Daus, P.: Simulation von Gezeitenströmungen zur Standortanalyse und Bestimmung vorhandener Potenziale. Wasserwirtschaft. 103, 54 - 57 (2013).
   

2012 [ to top ]

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  Ruprecht, A., Ruopp, A., Simader, J.: CFD Based Mathematical Optimization of Hydro Turbine Components Using Cloud Computing. SimHydro, Hydraulic modelling and uncertainty. SimHydro, Hydraulic modelling and uncertainty (2012).
   
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  Ruprecht, A., Ruopp, A., Bauer, N., Riedelbauch, S.: Hydraulic Development of Hydro Kinetic Turbines. 17th International Seminar on Hydropower Plants. 17th International Seminar on Hydropower Plants, Vienna, Austria (2012).
   

2011 [ to top ]

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  Ruopp, A., Ruprecht, A., Riedelbauch, S.: Automatic Blade Optimisation of Tidal Current Turbines Using OpenFOAM\textsuperscripttextregistered. EWTEC, Southampton, England. S. 7. 9th European Wave and Tidal Energy Conference (EWTEC), Southampton, UK (2011).
   
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  Ruprecht, A., Ruopp, A.: Entwicklung einer kinetischen Strömungsturbine. Wasserwirtschaft 101. 10, 34-37 (2011).
   

2006 [ to top ]

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  Koissin, V., Ruopp, A., Lomov, S.V., Verpoest, I., Witzel, V., Drechsler, K.: Internal structure of structurally stitched NCF preform. 12th European Conference on Composite Materials, ECCM 12, 2006. 12th European Conference on Composite Materials, ECCM 12, 2006 (2006).
  [ Abstract ] [ URL ]
   
  The paper addresses the experimental investigation of the unit cell architecture in a structurally stitched multilayer carbon-fibre preform. Each layer is a multiaxial multiply non-crimp fabric (NCF) knit with a non-structural stitching. The term structural presumes here that the stitching yarn does not only consolidate the plies (as the non-structural one does) but also forms a 3D reinforcement. One stitching technique tufting is studied, with 120 tex aramide yarn. The experimental data reveals a considerable irregularity of the piercing pattern and fibre distribution.
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  Koissin, V., Ruopp, A., Lomov, S.V., Verpoest, I., Witzel, V., Drechsler, K.: On-surface fibre-free zones and irregularity of piercing pattern in structurally stitched NCF preforms. Advanced Composites Letters. 15, 81--88 (2006).
  [ Abstract ] [ URL ]
   
  The paper addresses the surface imperfections (openings in fibrous plies) and irregularity of the piercing pattern in structurally stitched multilayer carbon-fibre preforms. Each layer is a multiaxial multiply non-crimp fabric (NCF) with a non-structural stitching. The term ?structural? presumes here that the stitching yarn does not only consolidate the plies (as the non-structural one does) but forms also a through-the-thickness (3D) reinforcement. Four stitching methods are studied: ordinary CNC-sewing, tufting, dual-needle, and curved needle techniques with multifilament yarns: aramide (60 or 120 tex) or glass (204 tex). In total, 14 stitching cases are investigated experimentally. It is observed that a non-negligible variability exists in the meso-level geometry of the reinforcement. The geometrical characterization provides important input data for analysis of the permeability and mechanical properties of the preforms.