Dona Pantova | Searcharxiv

arXiv2022

Approximation approach to the fractional BVP with the Dirichlet type boundary conditions

We use a numerical-analytic technique to construct a sequence of successive approximations to the solution of a system of fractional differential equations, subject to Dirichlet boundary conditions. We prove the uniform convergence of the sequence of approximations to a limit function, which is the unique solution to the boundary value problem under consideration, and give necessary and sufficient conditions for the existence of solutions. The obtained theoretical results are confirmed by a model example.

math.NA↗

arXiv2019

There's more than one way to cancel a regularized Stokeslet

The Green's functions of Stokes flow are widely used analytical and computational tools for microscale flows. We adapt a procedure from H.A. Lorentz for the method of images in Stokes flow to the regularized setting. Our solutions differ from those previously reported, a surprising result given the uniqueness theory for elliptic partial differential equations. The discrepancy originates in the fact that the two version are exact solutions of inhomogeneous Stokes systems with slightly different forcing on the right-hand sides. We compare the fluid flows produced by the two methods and conclude that the Lorentz versions may be advantageous in some settings.

physics.flu-dyn↗