scholarly journals A Case Study on Curtailed Tidal Hydrodynamic Modeling along UAE Coast

2012 ◽  
Vol 3 (1) ◽  
pp. 45-56 ◽  
Author(s):  
R Balaji
Keyword(s):  
Numerical Model ◽  
United Arab Emirates ◽  
Numerical Scheme ◽  
Large Scale ◽  
Water Levels ◽  
Abu Dhabi ◽  
Scale Model ◽  
Large Scale Model ◽  
Modeling Software ◽  
Model Setup

A curtailed numerical model has been developed to assess the tidal hydrodynamics of entrance of a navigational channel in Abu Dhabi coast, United Arab Emirates. The curtailed model is developed using a finite element based numerical scheme, RMA2 (Donnell et al., 2006). The boundary conditions for the model were extracted from a large scale numerical model covering entire Abu Dhabi coast, developed using TELEMAC (Hervouet, 2000) modeling software. The hydrodynamic results of the curtailed model are validated with that of large scale model. The comparisons of water levels and current velocities obtained from the two models are found to be in agreement, demonstrating the efficiency and accuracy of the curtailed numerical model. The features of the tidal current pattern in the vicinity of the entrance of the navigational channel are also discussed. The details of the numerical scheme, model setup and methodology are presented and discussed in this paper.

Hydrodynamic Forces on a Group of Three Emerged Cylinders by Solitary Waves and Bores: Effect of Cylinder Arrangements and Distances

2014 ◽  
Vol 08 (03) ◽  
pp. 1440005 ◽  
Author(s):  
Stefan Leschka ◽  
Hocine Oumeraci ◽  
Ole Larsen
Keyword(s):  
Numerical Model ◽  
Solitary Wave ◽  
Large Scale ◽  
Bottom Topography ◽  
Water Levels ◽  
Scale Model ◽  
Complex Flow ◽  
Large Wave ◽  
Roughness Elements ◽  
Large Roughness

In tsunami hazard assessment, usually depth-averaged flow models are applied which use the quadratic friction law with Manning's coefficients to describe the surface roughness of the bottom. Large roughness elements such as buildings and tree vegetation, which are too small to be resolved by the grid of the bottom topography, are mainly considered by using purely empirical Manning coefficients. This approach, however, is not physically sound and may thus result in very large uncertainties in inundation modeling. A more physically-based approach is to determine prediction formulae for the hydraulic resistance of large roughness elements, considering for example different shapes, sizes and types of arrangement which can then be directly implemented in depth-averaged models such as nonlinear shallow water (NLSW) models. Such prediction formulae can be determined on the basis of systematic simulations using a well-validated 3D numerical model. To better understand complex flow phenomena involved in tsunami inundation, three vertical emerged cylinders have been arranged in four different configurations with four different distances between each other and subject to a solitary wave and to a bore. A validated three-dimensional two-phase Reynolds-averaged Navier–Stokes (RANS) model with the volume of fluid (VOF) method has been used to assess flow velocities and water levels near the cylinders. In this study, the validation of the numerical model by data obtained from large-scale model tests in the Large Wave Flume (GWK) Hanover, the flume at the Leichtweiss Institute for Hydraulic Engineering and Water resources (LWI) and the wave tank of the University of Washington is presented and the effects types of cylinder arrangement and distances between the cylinders on the flow induced by a solitary wave and a bore in the near field are discussed.

RANCANG BANGUN PERANGKAT EKSPERIMENTASI PROSES PIROLISIS BIOMASA GELOMBANG MIKRO

2013 ◽  
Vol 14 (2) ◽  
Author(s):  
Noor Fachrizal
Keyword(s):  
Large Scale ◽  
Continuous Model ◽  
Biomass Energy ◽  
Scale Model ◽  
Small Scale ◽  
Laboratory Apparatus ◽  
Liquid Form ◽  
Large Scale Model ◽  
Bio Oil ◽  
Pyrolysis Of Biomass

Biomass such as agriculture waste and urban waste are enormous potency as energy resources instead of enviromental problem. organic waste can be converted into energy in the form of liquid fuel, solid, and syngas by using of pyrolysis technique. Pyrolysis process can yield higher liquid form when the process can be drifted into fast and flash response. It can be solved by using microwave heating method. This research is started from developing an experimentation laboratory apparatus of microwave-assisted pyrolysis of biomass energy conversion system, and conducting preliminary experiments for gaining the proof that this method can be established for driving the process properly and safely. Modifying commercial oven into laboratory apparatus has been done, it works safely, and initial experiments have been carried out, process yields bio-oil and charcoal shortly, several parameters are achieved. Some further experiments are still needed for more detail parameters. Theresults may be used to design small-scale continuous model of productionsystem, which then can be developed into large-scale model that applicable for comercial use.

Effect of an Oscillating Flow Direction on Leading Edge Heat Transfer

1984 ◽  
Vol 106 (1) ◽  
pp. 222-228 ◽  
Author(s):  
M. L. Marziale ◽  
R. E. Mayle
Keyword(s):  
Heat Transfer ◽  
Strouhal Number ◽  
Large Scale ◽  
Flow Direction ◽  
Leading Edge ◽  
Periodic Variation ◽  
Scale Model ◽  
Transfer Rates ◽  
Large Scale Model ◽  
Turbulence Length

An experimental investigation was conducted to examine the effect of a periodic variation in the angle of attack on heat transfer at the leading edge of a gas turbine blade. A circular cylinder was used as a large-scale model of the leading edge region. The cylinder was placed in a wind tunnel and was oscillated rotationally about its axis. The incident flow Reynolds number and the Strouhal number of oscillation were chosen to model an actual turbine condition. Incident turbulence levels up to 4.9 percent were produced by grids placed upstream of the cylinder. The transfer rate was measured using a mass transfer technique and heat transfer rates inferred from the results. A direct comparison of the unsteady and steady results indicate that the effect is dependent on the Strouhal number, turbulence level, and the turbulence length scale, but that the largest observed effect was only a 10 percent augmentation at the nominal stagnation position.

Large scale model tests on Royal Schelde SES

1989 ◽  
Author(s):  
R. DE GAAIJ ◽  
E. VAN RIETBERGEN ◽  
M. SLEGERS
Keyword(s):  
Large Scale ◽  
Model Tests ◽  
Scale Model ◽  
Large Scale Model

Experimental Study on the Behavior of a Swimming Pool Onboard a Large Passenger Ship

2009 ◽  
Vol 46 (01) ◽  
pp. 27-33
Author(s):  
Pekka Ruponen ◽  
Jerzy Matusiak ◽  
Janne Luukkonen ◽  
Mikko Ilus
Keyword(s):  
Large Scale ◽  
Hydraulic Cylinder ◽  
Operating Conditions ◽  
Swimming Pool ◽  
Scale Model ◽  
Longitudinal Motion ◽  
Sea State ◽  
Passenger Ship ◽  
Large Scale Model ◽  
Computer Controlled

The water in a swimming pool on the top deck of a large passenger ship can be excited to a resonant motion, even in a moderate sea state. The motion of the water in the pool is mainly caused by longitudinal acceleration, resulting from the ship's pitch and surge motions. At resonance, there can be high waves in the pool and splashing of water. In this study the behavior of the Solarium Pool of the Freedom of the Seas was examined in various sea states and operating conditions. The motions of the pool were calculated on the basis of a linear seakeeping method, and the behavior of the water in the pool was studied with experimental model tests. A large-scale model of the pool was constructed and fitted to a purpose-built test bench that could be axially moved by a computer-controlled hydraulic cylinder. Water elevation in the pool was measured, and all tests were video recorded. Different modifications of the pool were tested to improve the behavior of the pool. A strong correlation between the longitudinal motion and the behavior of the water in the pool was found.

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