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Comparison of dimensionless fluid stresses on the lower channel wall for R/H = 1/2 and H/L = 1/8 computed using the immersed boundary fluid stress (FS) and the immersed boundary wall stress (WS). The solid line in each figure is the BEM solution. For the IMBM, a 512 × 128 grid with one-way flow was used, with the FS evaluated one grid-point inwardly normal from the wall at X – nh.
