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Duringoffshore heavy lift or pipelay operations the station keeping capabilitiesof a DP-vessel have an important influence on operability limitsof these operations. Heerema Marine Contractors has two DP3-class semi-submersiblecrane vessels for these operations; the Thialf and Balder. Anassessment of the thrust efficiency of the DP thrusters ofthese vessels has been made by comparing CFD computations withdedicated model tests. A numerical study using CFD is performedto assess thruster-hull interaction on a semi-submersible vessel. The CFDresults are validated with a series of model tests,...
Accurate assessment of current loads on offshore vessels is required to determine operability of heavy lift and pipe lay operations. Whereas in the past only semi-empirical methods or model tests were suitable to obtain these data, CFD has recently become available as engineering tool to assess current loads on offshore structures. CFD has the potential to assess current loads more flexible in a numerical manner. Although the application of CFD has proven its value in assessment of ships resistance and VIV calculations, CFD is still not yet a fully proven method to calculate the current loads...
Most models of lithium-ion batteries follow the one-dimensional analysis approach. The major drawback of this is that the porosity and liquid-phase salt transport and solid-phase electronic conductivity are not explicitly resolved and the diffusion of lithium into and out of solid is modeled using representative spherical particles assuming perfect symmetry. These modeling assumptions limit the achievable accuracy; refinement of spatial computational grid and time steps cannot overcome the modeling error introduced by the above assumptions. Researchers at Battery Design LLC and CD-adapco set...
The axial compressor design of gas turbines is very important with respect to increase of power plant efficiencies. The optimization of the compressor design is usually performed by application of 1D or 2D through flow codes. However, the 3D flow analysis has become more important in recent years for further improvement of compressor efficiency by adapting the geometry to local flow phenomena. The 2D streamline curvature tool AixCompFlow2D has been developed for design and analysis of heavy duty axial compressors. By application of the TurboWizard, it has been linked to STAR-CCM+, so that the...
This paper focuses on the application of CFD to turbocharger compressor characteristics predictions over a range of speeds between 100,000 and 200,000RPM, and concentrating around the peak performance at 160,000RPM. A production turbocharger compressor which is widely used in the small-to-medium size automotive sector is studied. A methodical approach is taken to compare computation versus rig measurements, which represents an idealised installation. Benchmarking under the idealised rig conditions then gives a degree of confidence to apply the same prediction method to the device under real...
A computational fluid dynamics (CFD) model was developed to investigate the natural ventilation of a climatic livestock building under different wind incidences (WIs) for three different inlet opening areas. A ½ scale experimental duopitch building was employed to validate, both qualitatively and quantitatively, the CFD predictions of airflow distribution. To improve the applicability of CFD to building design, a thermal comfort index called the “minimum comfort temperature” was used in this study. Results showed that ventilation rates were not at their highest when wind was blowing normal to...

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