Asymptotic analysis of a biphase tumor fluid flow. The weak coupling case

TL;DR

This paper conducts an asymptotic analysis of a biphase tumor fluid flow model, revealing how it simplifies to a monophasic model with boundary corrections, supported by numerical simulations.

Contribution

It provides a rigorous asymptotic framework showing the reduction of a complex biphase model to a simpler monophasic model with boundary corrections.

Findings

Boundary layer effects become significant with increased vessel permeability.

The full biphase flow can be approximated by a monophasic model at any order.

Numerical simulations confirm the theoretical asymptotic results.

Abstract

The aim of this paper is to investigate the asymptotic behavior of a biphase tumor fluid flow derived by 2-scale homogenisation techniques in recent works. This biphase fluid flow model accounts for the capillary wall permeability, and the interstitial avascular phase, both being mixed in the limit homogenised problem. When the vessel walls become more permeable, we show that the biphase fluid flow exhibits a boundary layer that makes the computation of the full problem costly and unstable. In the limit, both capillary and interstitial pressures coincide except in the vicinity of the boundary where different boundary conditions are applied. Thanks to a rigorous asymptotic analysis, we prove that the solution to the full problem can be approached at any order of approximation by a monophasic model with appropriate boundary conditions on the tumor boundary and appropriate correcting terms near the boundary are given. Numerical simulations in spherical geometry illustrate the theoretical results.