| نویسندگان | احمدرضا رحمتی-رامین احسانی |
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| تاریخ انتشار | ۲۰۱۵-۱-۰۱ |
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چکیده مقاله
Abstract: Almost in the all researches about non-smooth surfaces, the drag on total surface is considered and
the effect of geometrical and flow parameters on the bumps placed on the surface are not studied separately.
The shape and geometry of these bumps has a significant effect on the final drag reduction and the topology
design of a non-smooth surface is highly affected by characteristics of these bumps. The flow past three hemicylindrical
bumps placed on smooth and curved boundaries was simulated using the lattice Boltzmann
method (LBM) in this paper. The LBM has been built up on the D2Q9 model and the single relaxation time
method called the Lattice-BGK (Bhatnagar-Gross-Krook) model. The effect of some parameters including the
distance between bumps, the size of bumps and Reynolds number in the case of straight boundary and the
size of bumps and angular position of bump’s center in the case of curved boundary are studied.