The weak Stokes problem associated with a flow through a profile cascade in Lr$L^r$‐framework

Tomáš Neustupa

Mathematische Nachrichten, 2023, vol. 296, issue 2, 779-796

Abstract: We study the weak steady Stokes problem, associated with a flow of a Newtonian incompressible fluid through a spatially periodic profile cascade, in the Lr$L^r$‐setup. The mathematical model used here is based on the reduction to one spatial period, represented by a bounded 2D domain Ω. The corresponding Stokes problem is formulated using three types of boundary conditions: the conditions of periodicity on the “lower” and “upper” parts of the boundary, the Dirichlet boundary conditions on the “inflow” and on the profile and an artificial “do nothing”‐type boundary condition on the “outflow.” Under appropriate assumptions on the given data, we prove the existence and uniqueness of a weak solution in W1,r(Ω)$\mathbf {W}^{1,r}(\Omega )$ and its continuous dependence on the data. We explain the sense in which the “do nothing” boundary condition on the “outflow” is satisfied.

Date: 2023
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