傾斜面上を表面波を伴って流れる流下液膜の数値計算 : 第1報, 気液界面条件の取扱い方法に関する考察〔流体工学, 流体機械〕

概要

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Numerical simulations have been carried out for a two-dimensional falling liquid film with interfacial waves. The staggered grid fixed on a physical space is employed and basic equations, continuity and Navier-Stokes equations, as well as equations for boundary conditions are discretized on the staggered grid without omitting any term in the equations. Neglecting the interfacial shear stress is only an assumption for the present analysis. New numerical methods are proposed for the interfacial boundary conditions and for the change of the film thickness, derived from the continuity equation. Simulation results agree well with experimental results in which waves are formed by artificial periodic disturbances. For both the simulation and the experiment, the developed waves disturbed at low frequency have a structure combined of a roll wave and capillary waves, while there is no capillary wave for high-frequency disturbance. The adyantages of the proposed methods are also presented.
一般社団法人日本機械学会の論文
1997-10-25