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With unrivaled polyhedral cell meshing, STAR-CCM+ cuts meshing time down from months to hours. Shown here is a polyhedral mesh generated on a fluidized bed geometry for pill coating.
DEM simulates the motion of a large number of interacting particles and tracks them in a numerically efficient manner, modeling contact forces and energy transfer due to collision and heat transfer between particles. Shown is a DEM simulation for a fluidized bed.
This paper presents an overview of the model development and validation of an advanced Computational Fluid Dynamics (CFD) computer code (CFD-BWR) that allows the detailed analysis of two-phase flow and heat transfer phenomena in Boiling Water Reactor (BWR) fuel bundles. The CFD-BWR code is being developed as a customized module built on the foundation of the commercial CFD-code STAR-CD which provides general two-phase flow modeling capabilities. The model development strategy that has been adopted by the development team for the prediction of boiling flow regimes in a BWR fuel bundle includes...
The paper describes advances in simulation technology for marine applications that have been achieved over the past 10 years. This includes handling of complex geometries, modeling of free-surface effects and cavitation, coupled simulation of flow and motion of floating bodies, and consideration of fluid-structure interaction. Examples from industry are used to explain the benefits obtained using modern simulation methods.
Anew code, CFD-BWR , is being developed for the simulationof two-phase flow phenomena inside a BWR fuel bundle. Thesephenomena include coolant phase changes and multiple flow regimes whichdirectly influence the coolant interaction with fuel assembly and, ultimately,the reactor performance. CFD-BWR is a specialized module built onthe foundation of the commercial CFD code STAR-CD whichprovides general two-phase flow modeling capabilities. New models describing theinter-phase mass, momentum, and energy transfer phenomena specific for BWRshave been developed and implemented in the CFD-BWR module...
Transient CFD analysis on turbomachines should be strongly encouraged. It opens up a new chapter of possibilities in the understanding of the workings, efficiency and design optimisation of rotating components.
The advanced model is a combination of a modified low Reynolds number k-epsilon turbulence model and a wall treatment formalism that accounts for temperature gradient induced material property effects on wall shear stress and heat flux. The advanced wall treatment formalism also enables more accurate turbulent source term computation in the wall adjacent cells. Furthermore, the advanced model is not restricted by the usual near wall grid resolution requirements of the standard high and low Reynolds number turbulence models.
The stability and accuracy of three methods which enforce either a divergence-free velocity field, density invariance, or their combination are tested here through the standard Taylor–Green and spin-down vortex problems. While various approaches to incompressible SPH (ISPH) have been proposed in the past decade, the present paper is restricted to the projection method for the pressure and velocity coupling. It is shown that the divergence-free ISPH method cannot maintain stability in certain situations although it is accurate before instability sets in. The density-invariant ISPH method is...
CFD analysis has been conducted on a 100m catamaran hull shape with various bow thruster positions in order to develop an understanding of the effects and losses that are generated from situating thrusters near the hull as well as the effect of having a hull downstream of the thruster. Various thruster angles, hull separations, and vertical heights were investigated to determine their influence on thruster losses.
A proton exchange membrane (PEM) fuel cell produces a similar amount of waste heat to its electric power output, and tolerates a small temperature deviation from its design point for best performance and durability. These stringent thermal requirements present a significant heat transfer problem. In this work, a three-dimensional, non-isothermal model is developed to account rigorously for various heat generation mechanisms, including irreversible heat due to electrochemical reactions, entropic heat, and Joule heating arising from the electrolyte ionic resistance. The thermal model is further...

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