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beta_f = -0.2_precision/dtstep
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qfp = qf - dtstep*(Ln*Lp*bfr + 2.0_precision * Lp*vis_wall(1)*dudx(1))  !vis_wall ºÍ  dudx(1)±íʾ±ÚÃæ´¦µÄ¼ôÇÐËÙ¶È

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