The coherent structures of EVP fluid flow past a circular cylinder
Adrián Corrochano, Kazi Tassawar Iqbal, Saeed Parvar, Soledad Le Clainche, Outi Tammisola
TL;DR
This study explores how elasticity and plasticity affect fluid flow around a cylinder, revealing how these properties influence flow patterns and complexity.
Contribution
The paper introduces a detailed analysis of viscoelastic and elastoviscoplastic fluid behavior using advanced decomposition techniques.
Findings
Increasing the Weissenberg number elongates the recirculation bubble in viscoelastic fluids.
Stronger plastic effects, especially with n ≥ 1, increase flow complexity in EVP fluids.
Three dynamic regimes are identified: periodic, transitional, and fully complex.
Abstract
This study investigates the impact of elasticity and plasticity on two-dimensional flow past a circular cylinder at Reynolds number \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document}Re=100. Ten direct numerical simulations were performed using the Saramito-Herschel–Bulkley model to represent viscoelastic and elastoviscoplastic (EVP) fluids. The flow evolves from a periodic von Kármán vortex street to chaotic-like regimes. Proper Orthogonal Decomposition (POD) and Higher Order Dynamic Mode Decomposition (HODMD) are applied to extract dominant flow structures and their temporal dynamics. For viscoelastic fluids, increasing the Weissenberg number Wi…
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Taxonomy
TopicsRheology and Fluid Dynamics Studies · Fluid Dynamics and Vibration Analysis · Fluid Dynamics and Thin Films