Pittsburgh, PA · University of Pittsburgh

Ziyue Yu

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Advised by Prof. Lei Fang, studying turbulence where inertia almost vanishes.

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About

I am a Ph.D. candidate in Civil and Environmental Engineering at the University of Pittsburgh, working with Prof. Lei Fang. My research focuses on turbulence in the weak-inertia regime — flows where inertia is nearly gone, yet multiscale transport stubbornly persists.

I study low-Reynolds-number turbulence, Lagrangian coherent structures (LCS), active-matter–flow interactions, and scale-to-scale energy transfer in quasi-two-dimensional flows, combining laboratory experiments (3D particle tracking velocimetry, electromagnetically forced flows) with custom spectral and Lagrangian diagnostics. A recurring theme in my work is that the geometry of a flow — how its stress and strain-rate tensors align — can carry as much physics as its energy, and that carefully controlling that geometry lets turbulence-like transport emerge in places it was never expected.

I came to fluid mechanics from a mechanical and aerospace engineering background at the Southern University of Science and Technology, where I worked with Prof. Hongyan Yuan. That path — from solids and computation toward the physics of flows — shaped how I like to work: build the experiment, measure it carefully, and let the structure in the data tell the story rather than the other way around.

Alongside research, I have taught as a teaching assistant at Pitt for Fluid Mechanics and for Engineering & Sustainable Development, which earned me the department's Teaching Assistant of the Year award. I find that explaining an idea clearly is part of understanding it in the first place.

Outside the lab, I enjoy photography — you'll find some of my photos around this site — and tinkering with hardware of all kinds.

Ziyue Yu with advisor Prof. Lei Fang, holding the 2025 Teaching Assistant of the Year award
With my advisor, Prof. Lei Fang — 2025 CEE Teaching Assistant of the Year.
  • PositionPh.D. Candidate, Civil & Environmental Engineering
  • UniversityUniversity of Pittsburgh
  • B.Eng.Mechanical & Aerospace Engineering, SUSTech (2020–2024)
  • LocationPittsburgh, PA, USA
  • Emailyuziyue20020619@outlook.com
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Programs & Publications

Research programs, papers, and talks. Preprints and PDFs are linked where available.

Finalizing

Two-Way Coupling in Active Suspensions Suppresses Particle Accumulation and Induces Non-Monotonic Flow Stabilization

M. Wu, Z. Yu, and L. Fang · Manuscript being finalized · Physical Review Fluids (2026)

Across 85 experiments with live Artemia salina swimmers in an electromagnetically driven cellular flow, finite swimmer loading suppresses the LCS accumulation predicted by one-way coupling, and the swimmers' back-reaction can either disrupt or — a previously unreported effect — reinforce the flow's transport skeleton, yielding a non-monotonic stability phase diagram in swimmer number × forcing strength.

In Progress

How Many Steps Does It Take to Kill the Tornado

Z. Yu and L. Fang · Research in progress (2025)

An energy-efficient strategy for destabilizing tornado-like vortices with small directional perturbations that trigger forward spectral energy flux and progressively collapse the vortex core.

Talk

Low Reynolds Number Turbulence: Tensor Geometry Drives Turbulence in the Diminishing of Inertia

Z. Yu and L. Fang · 78th Annual Meeting of the APS Division of Fluid Dynamics, Houston, TX (2025)

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Resume

A condensed version — the full CV is available as a PDF download.

Education

Ph.D., Civil & Environmental Engineering

Sep 2024 – Present

University of Pittsburgh, Pittsburgh, PA

Advisor: Prof. Lei Fang

B.Eng., Mechanical & Aerospace Engineering

Sep 2020 – Jun 2024

Southern University of Science and Technology (SUSTech), Shenzhen

Advisor: Prof. Hongyan Yuan

Presentations

78th Annual Meeting of the APS Division of Fluid Dynamics

Nov 2025

“Low Reynolds Number Turbulence: Tensor Geometry Drives Turbulence in the Diminishing of Inertia,” Houston, TX.

Teaching

Teaching Assistant, University of Pittsburgh

2024 – 2025

CEE 1402 Fluid Mechanics · CEE 1610 Engineering and Sustainable Development

Selected Awards

Teaching Assistant of the Year

2025

Civil & Environmental Engineering, University of Pittsburgh

SUSTech Scholarships & Honors

2020 – 2022

Second-class Scholarship for Outstanding Students · Fastest Progress Scholarship (MAE) · Star of Literature and Art · Outstanding Student Advisor

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Photos

A little gallery of my life from 2020 to now — college, graduation, and everything after.

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Contact

Always glad to talk about fluid mechanics, active matter, or photography — whether it's a potential collaboration, a question about my work, or just to say hello. Email is the fastest way to reach me.

Say hello →