粘弾性法線応力差による乱流抵抗低減機構の解明(非ニュートン,一般講演)

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概要

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• The mechanism of turbulent drag reduction in the polymer-diluted flow is studied using the direct-numerical simulation of isotropic turbulence and pipe flow. The polymer stress is obtained by solving the non-affine Johnson-Segalman constitutive equation. The largest drag reduction is achieved when the non-affinity is maximum. The normal-stress difference (nsd) is estimated on the basis of new eigenvectors which span the vortex tube and sheet. It is shown that the first and second nsds are predominantly positive and negative, respectively, along the sheets and tubes. Thereby, extra tension is exerted on the sheets and tubes, and resistence to their stretching is enhanced.

• 2010-09-09

著者

• 堀内 潔

  東工大院

• 松本 一真

  東工大院

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