水平なクロスフロー中の高温噴流の数値シミューレション(解析・予測・制御乱流の予測とモデリング(2),一般講演)

概要

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Flows with low Mach number are usually treated as incompressible, using the Boussinesq approximation to consider buoyancy. However, the range of application of the Boussinesq approximation is limited to small temperature differences, and it does not take in account small volume changes in the fluid due to thermal expansion and small compressibility. In order to deal with this problem, the use of the weak compressibility model is proposed. This paper reports on numerical simulations of a hot jet in a horizontal cross-flow with jet to cross-flow velocity ratio of 3.3 and 3 different temperatures. Simulations were performed first with the incompressible scheme using the Boussinesq approximation and then the weak compressible scheme. A comparison between results of both schemes shows that there is an important difference in the jet trajectories in the short field.
2009-09-02