# Finite-Size Effects on Karman Vortex in Molecular Dynamics Simulation

## TL;DR

This paper investigates how finite-size effects influence the simulation of Karman vortices in molecular dynamics, aiming to identify conditions for quantitatively matching experimental vortex shedding frequencies.

## Contribution

It identifies key factors like vortex interference and viscosity nonuniformity that cause finite-size effects in MD simulations of Karman vortices.

## Key findings

- Finite-size effects significantly alter vortex characteristics.
- Simulation conditions can be optimized for quantitative accuracy.
- Finite-size effects are mainly due to vortex interference and viscosity nonuniformity.

## Abstract

The characteristics of the Karman vortex generated by a molecular dynamics (MD) simulation exhibit strong finite-size effects, and MD can only reproduce the experimental results qualitatively. Here, we seek the simulation conditions for quantitatively reproduce the vortex shedding frequency. We found that the finite-size effects are mainly caused by the interference of vortices and the nonuniformity of the fluid viscosity coefficient.