Non-adiabatic Effect on Convective Mode

TL;DR

This paper investigates how non-adiabatic effects influence convective modes, revealing that strong non-adiabaticity can cause a transition from monotonic growth to oscillatory behavior with abrupt changes in energy distribution.

Contribution

It introduces a systematic analysis of non-adiabatic effects on convective modes using wave energy relations and proposes a propagation diagram for better understanding.

Findings

Strong non-adiabaticity causes convective modes to become oscillatory.

Entropy energy acts as potential energy in oscillatory convection.

The transition occurs abruptly with changes in non-adiabatic indicators.

Abstract

The systematic analysis of non-adiabatic effect on convective mode has been conducted using wave energy relation. In the adiabatic analysis, the "propagation diagram" for convective mode is proposed as a useful tool to see its behavior. In the non-adiabatic analysis, it is found that for strongly non-adiabatic case, a monotonically growing convective mode becomes oscillatory. In this phase, the radial displacement and the distribution of wave energy show only one bump, in which the distribution of entropy energy eS almost overlaps with the distribution of gravity energy eg. Entropy energy eS seems to act as potential energy of oscillatory convection. In addition to this, this change occurs not gradually, but abruptly with change of non-adiabatic indicator.