# Two scenarios of advective washing-out of localized convective patterns under frozen parametric disorder

## TL;DR

This paper investigates how advection influences the suppression of localized convective patterns in a modified Kuramoto-Sivashinsky system with frozen parametric disorder, revealing two bifurcation scenarios through simulations and model reduction.

## Contribution

It identifies and characterizes two distinct bifurcation scenarios of advective washing-out of localized patterns, advancing understanding of pattern suppression mechanisms.

## Key findings

- Two bifurcation scenarios of pattern suppression are identified.
- Advection alters localization properties and suppresses patterns.
- Model reduction aids in understanding bifurcation mechanisms.

## Abstract

The effect of spatial localization of states in distributed parameter systems under frozen parametric disorder is well known as the Anderson localization and thoroughly studied for the Schr\"odinger equation and linear dissipation-free wave equations. Some similar (or mimicking) phenomena can occur in dissipative systems such as the thermal convection ones. Specifically, many of these dissipative systems are governed by a modified Kuramoto-Sivashinsky equation, where the frozen spatial disorder of parameters has been reported to lead to excitation of localized patterns. Imposed advection in the modified Kuramoto-Sivashinsky equation can affect the localized patterns in a nontrivial way; it changes the localization properties and suppresses the pattern. The latter effect is considered in this paper by means of both numerical simulation and model reduction, which turns out to be useful for a comprehensive understanding of the bifurcation scenarios in the system. Two possible bifurcation scenarios of advective suppression ("washing-out") of localized patterns are revealed and characterised.