J0501-3-6 PTVとDNSを融合した非定常流シミュレーションアルゴリズムとその応用([J0501-3]流体機械の研究開発におけるEFD/CFD(3))

概要

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We acquire particle velocities on a laser-light sheet with PTV and generate time-resolved velocity fields compatible with DNS by rectifying PTV velocity fields to satisfy the continuity. By synchronizing the DNS time step with the PTV frame rate, we feed a rearranged velocity field at each time step and compute the two-dimensional incompressible Navier-Stokes equations over time. At each time step, velocity components are given by the linear combination between those from PTV and those updated with DNS, and their weight is determined so that the hybrid velocity field is directed toward the measured one with a minimum noise level. Thus, unsteady velocity and pressure fields satisfying the governing equations can be simultaneously obtained with the resolution comparable to the numerical simulation. The algorithm and features of this hybrid algorithm are introduced by taking examples from flows past a NACA0012 airfoil and a planar jet.
一般社団法人日本機械学会の論文
2010-09-04