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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...
Cavitation and silt erosion often co-exist causing severe damage. The effect that the silt erosion is worsened by the presence of cavitation is here referred as cavitation enhancement of silt erosion. A micro-model proposed by Li (2003, 2006) describes how the silt particles gain extra-damaging potential from the collapsing bubbles. In order to verify this envisaged model, as suggested in Li (2006) we have performed initial numerical studies by employing a simplified model which considers a single silt particle entrained in the micro-jet of a collapsing cavitation bubble. Initial CFD...
The γ-Reθ transition model is the first correlation-based model designed for unstructured, parallel CFD codes. Two out of the three correlations required to complete the model have not yet been published by the originators of the model. This paper presents plausible forms for the missing correlation functions and describes a process for calibrating them against published data. The complete model and its implementation in a modern commercial CFD code is described. Results are presented for flat plate boundary layers, with and without pressure gradient, and for several airfoil and...
The paper presents a simulation approach to Li-Ion batteries based on geometrically resolved electrodes. This means that solid particles and the space occupied by electrolyte are not overlapping but are represented by contiguous, arbitrarily shaped volumes. The solid-electrolyte interface is explicitly resolved and thus allows detailed modeling of electrochemical processes that are essential for studying performance of the battery cell. Finite volume method is used to solve the equations governing the mass and thermal energy conservation in solid and electrolyte, as well as the distribution...
The γ-Reθ transition model is the first correlation-based model designed for unstructured, parallel computational fluid dynamics (CFD) codes. Two out of the three correlations required to complete the model have not yet been published by the originators of the model. This paper presents plausible forms for the missing correlation functions and describes a procedure for calibrating the model.
A general approach for the design of cylindrical and prismatic spirally-wound lithium-ion cells that accounts for arbitrary tabbing and coating patterns is presented. Examples are presented for design of high-power and high-energy 18650 size cells. For highenergy cells the current collector design is not critical while for high-power cells the tabbing design is significant especially when thermal effects are considered.
Theslamming of breaking waves on the legs of large volumeoffshore platforms has received increased attention over recent years. Toinvestigate this problem, MARINTEK's Wave Impact Loads JIP has, inone of its sub-tasks, focused towards an idealised model testsetup of a rectangular cylinder in breaking waves. The modelconsists of a vertical column with a fragment of ahorizontal deck attached. The model is fixed at a distanceL ahead of the wave maker. Physical scale model testexperiments of the block in regular waves and in wavegroups have been carried out in Phase 1 of theJIP (2008). The...
Ithas been well-known that many industrial applications that use centrifugalcompressors have continuously demanded for more and more efficient machinesin the past decade or so. However, the current markettrend indicates that there is a strong demand among theend users for reduced delivery times of these efficient compressors.This, in turn, requires that the aerodynamic design of highlyefficient centrifugal stages be completed within shorter time frames. Inorder to meet these challenges, it is mandatory to involvemodern computational analysis tools such as Computational Fluid Dynamics (CFD)as...

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