Boundary-Domain Integral Equation Systems to the Dirichlet and Neumann
Problems for Compressible Stokes Equations with variable viscosity in 2D
Abstract
In this paper, the Dirichlet and Neumann boundary value problems for the
steady-state Stokes system of partial differential equations for a
compressible viscous fluid with variable viscosity coefficient is
considered in two-dimensional bounded domain. Using an appropriate
parametrix, this problem is reduced to a system of direct segregated
boundary-domain integral equations (BDIEs). The BDIEs in the
two-dimensional case have special properties in comparison with the
three dimension because of the logarithmic term in the parametrix for
the associated partial differential equations. Consequently, we need to
set conditions on the function spaces or on the domain to ensure the
invertibility of corresponding parametrix-based hydrodaynamic single
layer and hypersingular potentials and hence the unique solvability of
BDIEs. Equivalence of the BDIE systems to the Dirichlet and Neumann BVPs
and the invertibility of the corresponding boundary-domain integral
operators in appropriate Sobolev spaces are shown.