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This paper presents the application of state-of-the-art Computational Fluid Dynamics (CFD) simulations to sailing and motor yachts. It aims to demonstrate that simulations are a good alternative to tank testing for the super and mega yacht industry. The simulations are based on experience gathered over the last few years designing high performance racing boats, especially in America's Cup and Volvo Ocean Race campaigns, the Formula One of the seas. CFD is one of the new technologies that can, as was done in the auto industry, be successfully transferred from the racing environment to general...
One aspect of the Westinghouse AP1000™ 1 reactor design is the reduction in the number of major components and simplification in manufacturing. One design change relative to current Westinghouse reactors of similar size is that AP1000 reactor vessel has two nozzles/hot legs instead of three. With regard to fuel performance, this design difference creates a different flow field in the reactor vessel upper plenum. The flow exiting from the core and entering the upper plenum must turn toward one of the two outlet nozzles and flow laterally around numerous control rod guide tubes and support...
The major shortcoming namely short-circuiting of fresh charge into atmosphere of a two-stroke engine has been correlated to the spatially and temporally changing in-cylinder velocity patterns. In a small engine, modifications in the cylinder head for carrying out experiments to investigate the gas exchange phenomenon become extremely difficult. CFD study offers the effective alternative for such investigations and this study has been undertaken to develop a model using a commercial CFD code STAR-CD and study the gas exchange process in a small 100 cc SUZUKI two-stroke engine. The geometric...
Rising fuel prices and stricter regulations on emissions drive a quest for more fuel efficient ships that is reminiscent of the 1970s, when after the first oil shock a plethora of fuel saving devices was investigated. Examples are Schneekluth ducts (wake equalizing ducts), Grim vane wheel, Grothues spoilers,or asymmetric aftbodies, Schneekluth and Bertram (1998). Many of the “propulsion improving devices”of the 1970s are now again under debate. More than a generation later, we start basically again from scratch. The original reports on efficiency gains are often incomplete and invariably...
Technology Update on Battery Design
A s the electrification of transport increases so does the need for ever more refined simulation techniques to predict component and system performance. This electrification trend has been growing over recent years with vehicles now available including hybrid, plug-in Hybrid and fully electric vehicles from a variety of manufacturers. Since CD-adapco and Battery Design LLC first released their flow, thermal and electrochemistry simulation tools 2 years ago, there has been significant product development driven by customer feedback and a desire to continue to lead this emerging field. This...
The design of a buoyancy valve for a renewable energy thermal storage tank led us to this interesting CFD problem. The purpose of the valve is to allow water to circulate within the system when the temperature of the water rises above a critical value. From Archimedes principle, a buoyancy oat made from a given material will rise (providing a closed state for the valve) when below a critical temperature and sink (providing an open state for the valve) when above a critical temperature. However, the precise valve response depends on internal temperature and mass- ow dynamics. In this paper, we...
Some of the limitations of Reynolds Averaged Navier Stokes (RANS) based Computational Fluid Dynamics CFD codes in computing the flow and temperature field in a rod-bundle are well known. An in-house validation campaign has indicated that the Baseline Reynolds Stress Model (BSL-RSM) with automatic wall treatment is preferred for RANS analyses of a rod-bundle using the CFX code. As a first step in the present paper, the employed CFX code has been assessed with the analyses of a liquid sodium flow in a rod-bundle as in the TEGENA (TEmperatur- und GEschwindigkeitsverteilungen in Stabbündel mit...
With the increasing focus on the use of lithium ion batteries for traction applications the ability to simulate electrochemical and thermal performance of such batteries is of great interest. This paper details a multi-length scale approach which is used to simulate a single lithium ion pouch cell and compare against some previously published experimental work. This approach is then extended and used as a building block to a much more complex simulation using multiple cells within a battery pack. This technology also simulates the cooling system performance and the inherent coupled behavior...
This paper presents CFD analyses in heat unsymmetric subchannels and heat symmetric seven-rod bundle geometries of a Super Fast Reactor (Super FR) fuel assembly using STAR-CD. The purpose of CFD analyses in heat unsymmetric subchannels is to evaluate the effect of the power differences on the heat transfer in subchannels of the Super Fast Reactor. For heat symmetric seven-rod bundles, the effects of the gap clearance between the fuel rod and the assembly wall and the displacement of the fuel rod on the circumferential temperature distributions and Maximum Cladding Surface Temperature (MCST)...
The use of cavitation modeling within the maritime industry area is in a crucial state. The advances in the computer power, the understanding of the numeric’s and of the cavitation phenomena do make possible to bring these kinds of simulations into the daily use. The goal is a cavitation method to be applied from the design stage to the problem solving situations. The paper will present cavitating results obtained for a two dimensional case: NACA 0015 profile and for a three dimensional case: Twist11 foil. These cases are the most popular numerical and experimental benchmarks used to validate...

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