Nonlinearity in Oscillatory Flow over Sand Ripple

TL;DR

This paper investigates nonlinear flow phenomena over sand ripples using direct numerical simulation to analyze flow patterns, vorticity, and velocity components near wavy boundaries in oscillatory flow conditions.

Contribution

It introduces a DNS framework to study nonlinear flow dynamics over sand ripples, focusing on vertical velocity components and flow behavior near ripple bottoms.

Findings

Nonlinear terms in vertical velocity increase with Reynolds stress.

Flow patterns near wavy boundaries are characterized under DNS.

Vertical velocity components exhibit nonlinear behavior in oscillatory flow.

Abstract

In this report, We investigated the nonlinear phenomena in the study of flow dynamics of velocity component. In our studies, we observed nonlinear term in the vertical component of velocity by vittori et al \cite{vit} The time series simulation of vertical component which increases with Reynold stress value. We developed direct numerical simulation under two dimensional grid system to study the flow dynamics and vorticity parameter. Flow pattern and flow dynamics near wavy boundary wall in the victinity of ripple bottom was readdressed under direct numerical simualtion(DNS) framework.