Water Flow Simulation of Tigris River Between Samara and Baghdad Based on HEC-RAS Model

A new concept of hydrokinetic turbine using oscillating hydrofoils to extract energy from water currents (tidal or gravitational) is presented, tested and analyzed in the present investigation. Due to its rectangular extraction plane, this technology is particularly well suited for river beds and shallow waters near the coasts. The present turbine is a 2 kW prototype, composed of two rectangular oscillating hydrofoils of aspect ratio 7 in a tandem spatial configuration. The pitching motion of each hydrofoil is coupled to their cyclic heaving motion through four-link mechanisms which effectively yield a one-degree-of-freedom system driving a speed-controlled electric generator. The turbine has been mounted on a custom-made pontoon boat and dragged on a lake at different velocities. Instantaneous extracted power has been measured and cycle-averaged for several water flow velocities and hydrofoil oscillation frequencies. Results are demonstrated to be self-consistent and validate our extensive 2D flow simulation database. The present data show optimal performances of the oscillating hydrofoils concept at a reduced frequency of about 0.12, at which condition the measured power extraction efficiency reaches 40% once the overall losses in the mechanical system are taken into account. Further measurements of power extraction with a single oscillating hydrofoil have also been performed by taking out the downstream hydrofoil of the tandem pair. Those measurements favorably compare, quantitatively, with available 3D CFD predictions. The 40% hydrodynamic efficiency of this first prototype exceeds expectation and reaches levels comparable to the best performances achievable with modern rotor-blades turbines. It thus demonstrates the promising potential of the oscillating hydrofoils technology to efficiently extract power from an incoming water flow.

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Comparison of surface water flow simulation over structured and unstructured grids

Spatial Information Research ◽

10.1007/s41324-021-00413-6 ◽

2021 ◽

Author(s):

Nivedhitha Ajithkumar ◽

Prabhakar Alok Verma ◽

Frank B. Osei ◽

Hari Shankar

Keyword(s):

Surface Water ◽

Water Flow ◽

Unstructured Grids ◽

Flow Simulation ◽

Surface Water Flow

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AQMAN; linear and quadratic programming matrix generator using two-dimensional ground-water flow simulation for aquifer management modeling

10.3133/wri874061 ◽

1987 ◽

Keyword(s):

Quadratic Programming ◽

Ground Water ◽

Water Flow ◽

Flow Simulation ◽

Two Dimensional ◽

Ground Water Flow ◽

Aquifer Management ◽

Matrix Generator

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Representation of Multiaquifer Well Effects in Three-Dimensional Ground-Water Flow Simulation

Ground Water ◽

10.1111/j.1745-6584.1982.tb01354.x ◽

1982 ◽

Vol 20 (3) ◽

pp. 334-341 ◽

Cited By ~ 13

Author(s):

Gordon D. Bennett ◽

Angelo L. Kontis ◽

Steven P. Larson

Keyword(s):

Ground Water ◽

Water Flow ◽

Three Dimensional ◽

Flow Simulation ◽

Ground Water Flow

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Surface Tension Analysis of Cost-Effective Paraffin Wax and Water Flow Simulation for Microfluidic Device

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.832.773 ◽

2013 ◽

Vol 832 ◽

pp. 773-777

Author(s):

Nurulazirah Md Salih ◽

U. Hashim ◽

Nayan Nafarizal ◽

Chin Fhong Soon ◽

Mohd Zainizan Sahdan

Keyword(s):

Surface Tension ◽

Contact Angle ◽

Flow Velocity ◽

Water Flow ◽

Microfluidic Device ◽

Flow Simulation ◽

Channel Length ◽

Paraffin Wax ◽

Inlet Channel ◽

Water Flow Velocity

In microfluidic devices, the most important aspect has to be considered for the manufacturing process is the material suitability and geometric design. Among the materials studied, paraffin wax has never been tested and it is proposed as the new approach in this paper for patterning the microchannels. Furthermore, contact angle analysis of the paraffin wax was also studied. Based on the contact angle measurements; the hydrophobicity and surface tension of paraffin wax were analyzed. From the finding, it shows that paraffin wax has a low surface tension and high hydrophobicity. Then, several microchannels design was simulated using COMSOL multiphysics 4.2 software in order to find the optimized geometry. It involves a study of different shape, diameter, length, and angle of microchannels design, and its influence on the water flow velocity. From the simulation results, an optimize microchannels design was obtained consists of 1000 μm channels diameter, 1000 μm inlet channel length, 1.0 cm outlet channels length, and 110o inlet channel angle with water flow velocity of 2.3cm/s. Further study could be done to improve the finding of properties and geometric suitability for microfluidic device.

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