River bends are rarely simple, i.e., the bend radius is rarely constant throughout the bend length. They are rather irregular, i.e. their shape in the plan can be approximated with different bend radii. Since the bulk of previous research is concerned with simple bends, this paper aims at studying the effect of variable bend curvature on flow in an irregular bend with two bend radii. The effect is studied numerically, using a 3D finite volume based model SSIIM1, which solves Reynolds-Averaged Navier-Stokes (RANS) equations with two-equation turbulence model closure.
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Ghobadian et al. (2021) studied this question.
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