Abstract
The article deals with a three-dimensional turbulent model of the flow of a viscous liquid in an open rectangular channel. On the free surface, the condition of friction in the longitudinal direction is taken into account, on and near the wall of the channel the conditions are set: adhesion, laminar and turbulent layers, and along the longitudinal axis of the flow - the condition of periodicity. To solve the problem, a cosine-shaped spectral function by vertical coordinate and a predictor-corrector scheme of the method of fractional steps by horizontal coordinates are used. For isoperimetric data, the corrector scheme uses the Buneman algorithm, which is particularly complex.
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