# On physical optics approximation of viscous stratified shear flows

## TL;DR

This paper develops a mathematical model for viscous stratified shear flows, deriving a modified Taylor-Goldstein equation and applying geometric and physical optics approximations to analyze wave behavior.

## Contribution

It introduces a modified TG equation incorporating vertical and horizontal viscosity effects and applies WKB methods to study asymptotic solutions near singularities.

## Key findings

- Derived a fourth-order modified TG equation with viscosity effects.
- Applied WKB method to analyze wave solutions in stratified shear flows.
- Investigated wave behavior near turning points and critical levels.

## Abstract

We study a mathematical model of a perturbed stratified shear mean flow in the presence of eddy coefficients of turbulent viscosity. We adopt the standard Boussinesq approximation in the natural convection of the buoyancy-driven flow and neglect the influence of the eddy coefficients of turbulent diffusivity. Comprising both the vertical and horizontal viscosity effects, a model for the vertical velocity perturbation corresponds to a fourth-order Taylor-Goldstein (TG) differential equation. Considering only the latter, we obtained a modified TG equation with the same order as the classical, inviscid one. Under an assumption of the slowly varying Brunt-V\"ais\"al\"a frequency and background horizontal velocity, we discuss the corresponding geometrical and physical optics approximations of the modified TG equation using the WKB method. We further investigate the behavior of these asymptotic solutions near singular values of a turning point and critical level.