境界壁の弾性移動を考慮した内部流れの数値解析

概要

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A computational model of a neutrally buoyant stenosis deforming in fluid is presented. The fluid is assumed to be viscous and incompressible and the stenosis to be a massless and elastic boundary immersed in the fluid. Fluid motion is described on a fixed mesh (Eulerian description), and the immersed boundary is represented by a discrete collection of moving material points connected by springs (Lagrangian description). Communication between Eulerian and Lagrangian variables is required in order to apply elastic force to the fluid and to move the elastic material with the local fluid velocity. Such communications are mediated by an approximation to the Dirac delta function (immersed boundary technique). The computed results are compared with a rigid-model analysis by boundary-fitted coordinates (BFC). The comparison reveals essential differences in the high pressure gradients around the stenosis. It is explained that the elastic stenosis is deformed in the direction favorable for diminishing pressure gradients.
一般社団法人日本機械学会の論文
1995-04-25