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首页> 美国政府科技报告 >Numerical investigations of turbulent flow through parallel channels connected by a gap. (Numerische Untersuchung der turbulenten Stroemung durch parallele Kanaele, die durch einen Spalt miteinander verbunden sind)
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Numerical investigations of turbulent flow through parallel channels connected by a gap. (Numerische Untersuchung der turbulenten Stroemung durch parallele Kanaele, die durch einen Spalt miteinander verbunden sind)

机译：通过间隙连接的平行通道的湍流数值研究。 （Numerische Untersuchung der turbulenten stroemung durch parallele Kanaele，die durch einen spalt miteinander verbunden sind）

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Large-scale quasi-periodic flow motions between subchannels are observed for axial turbulent flow through rod bundles. The origin and source of the pulsations are not yet completely understood. A more general geometry consisting of two parallel rectangular channels connected by a gap has beeb experimentally investigated using hot wire anemometry. The characteristic phenomena of flows through gaps known from similar geometries were also found for the cross-section investigated here. This concerns unusually high vlaues for turbulence intensities, Reynolds shear stresses and spectral power densities in certain regions of the gap. An appropriate geometry has been numerically investigated with the large eddy simulation method (LES). Methodical modifications and adaptions of the code TURBRIT necessary for the treatment of the special problem are explained. The influence of parameters like Reynolds number, mesh size and periodicity length on the results of the simulation is also described. (orig./HP)

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