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Computational Fluid Mechanics And Heat Transfer

Particle methods in ocean and coastal engineering

Abstract : A series of constant-deadrise models, varying in length, was tested in smooth water and regular waves to define the effects of deadrise, trim, loading, speed, length-beam ratio, and wave proportions on the added resistance, on heave and pitch motions, and on impact accelerations at the bow and center of gravity. Each of these parameters was varied independently of the others so as to obtain a proper evaluation of the effects of changing a single quantity. The results, presented in the form of response characteristics, cover a wide range of operating conditions; and show, quantitatively, the importance of design parameters on the rough-water performance of planing hulls.

A systematic study of the rough water performance of planing boats. Part II: Irregular waves

Fuel cells offer the possibility of zero-emissions electricity generation and increased energy security. We review here the current status of solid oxide (SOFC) and polymer electrolyte membrane (PEMFC) fuel cells. Such solid electrolyte systems obviate the need to contain corrosive liquids and are thus preferred by many developers over alkali, phosphoric acid or molten carbonate fuel cells. Dramatic improvements in power densities have been achieved in both SOFC and PEMFC systems through reduction of the electrolyte thickness and architectural control of the composite electrodes. Current efforts are aimed at reducing SOFC costs by lowering operating temperatures to 500–800 °C, and reducing PEMFC system complexity be developing ‘water-free’ membranes which can also be operated at temperatures slightly above 100 °C.

Fuel cell materials and components

A versatile algorithm for the treatment of open boundary conditions in Smoothed particle hydrodynamics GPU models

Application of a panel method to hydrodynamics of underwater vehicles

Non-linear hydrodynamics of thin laminae undergoing large harmonic oscillations in a viscous fluid

A low-order singularity panel method based on Green`s formulation is used to predict the hydrodynamics characteristics of underwater vehicles. The low-order modeling employs constant strength sources and doublets, and the body surface is modeled by quadrilaterals. The method is first applied to predicting the force and moment coefficients of underwater vehicles for the body-alone and finned configurations. Hydrodynamic coefficients of added mass and added moment of inertia are also calculated by modifying the code. Results for several two and three-dimensional bodies show the usefulness of the method for predicting the added mass and added moment of inertia.

Iskender Sahin

Papers

Application of a panel method to hydrodynamics of underwater vehicles

Non-linear hydrodynamics of thin laminae undergoing large harmonic oscillations in a viscous fluid

Application of a panel method to hydrodynamics of underwater vehicles

Numerical investigation of wave elevation and bottom pressure generated by a planing hull in finite-depth water

Hydrodynamic analysis and optimization of the Titan submarine via the SPH and Finite–Volume methods