乱流場における熱と運動量の非相似性に関する研究(乱流熱物質拡散・伝達(1),一般講演)

概要

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The similarity between turbulent heat transfer and Reynolds stress is investigated using the equations written in Lagrange description. Among the contributions to the turbulent transfer, the correlation between pressure gradient fluctuation and vertical velocity depresses the Reynolds stress, which makes the turbulent Prandtl number Prt less than unity in the log-law region. From the consideration of vortex structure, the transverse vorticity may be responsible for the dissimilarity. Assuming an external force field to reinforce the transverse vorticity, the drag increase and the heat transfer enhancement are calculated numerically. The result shows that the drag is slightly reduced while the heat transfer is doubly enhanced.
日本流体力学会の論文
2007-08-06