粘弾性流体の抵抗低減乱流に適用可能なk-εモデルの提案(解析・予測・制御流れの制御(2),一般講演)

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It is known that minute amount of added long-chain polymer molecules or surfactant solution can reduce drug in a turbulent flow. This paper is to approach the problem of predicting turbulent flow under the drug reduction by a turbulence model. To solve the above problem, we propose a modification of the low-Reynolds-number k-ε model to apply to a visco-elastic fluid. The fact that the length and time scales of a turbulent eddy, which is in the energy-dissipative range, is becomes larger than the values of Newtonian fluid is taken into consideration. To verify the present model, we calculated the mean velocity and the shear stress profiles of a drag-reducing turbulent channel flow under several conditions of rheology parameters and obtained results which agree with DNS results.
2009-09-02