Oana Lang

I am a lecturer in the Department of Mathematics at Babeș-Bolyai University. My research lies in stochastic analysis, with particular emphasis on nonlinear stochastic partial differential equations and their connections with fluid dynamics, filtering, and data assimilation.

Before joining Babeș-Bolyai University in 2024, I was a Research Associate at Imperial College London within the ERC Synergy project Stochastic Transport in Upper Ocean Dynamics (STUOD). I completed my PhD in Mathematics at Imperial College London in 2020.

My research focuses on stochastic transport models, nonlinear SPDEs, and problems arising in geophysical fluid dynamics, with additional interests in nonlinear filtering and data assimilation.

At UBB I supervise undergraduate and Master's projects and collaborate on problems in stochastic analysis, SPDEs, stochastic fluid dynamics, nonlinear filtering, and related topics. I also contribute to European research networks in stochastic analysis.

1. Well-posedness and Hurst parameter estimation for fluid equations driven by fractional transport noise
   with A. Blessing and D. Crisan, 2026 Preprint
2. Global solutions for stochastically controlled fluid dynamics models
   with D. Crisan, Stochastics and Partial Differential Equations: Analysis and Computations, published online 2025
3. Bayesian inference for geophysical fluid dynamics using generative models
   with D. Crisan and A. Lobbe, Philosophical Transactions of the Royal Society A, 2025
4. Well-posedness for a stochastic 2D Euler equation with transport noise
   with D. Crisan, Stochastics and Partial Differential Equations: Analysis and Computations
5. Analytical properties for a stochastic rotating shallow water model under location uncertainty
   with D. Crisan and E. Mémin, Journal of Mathematical Fluid Mechanics, 2023
6. Well-posedness properties for a stochastic rotating shallow water model
   with D. Crisan, Journal of Dynamics and Differential Equations

A fuller publication list is available on my extended academic website and through ORCID.

Appointments and education

• 2024–present
  Lecturer in MathematicsBabeș-Bolyai University
• 2020–2024
  Research Associate, STUODDepartment of Mathematics, Imperial College London
• 2020
  PhD in MathematicsImperial College London
• 2016
  MRes, Mathematics of Planet EarthImperial College London and University of Reading, with distinction
• 2013–2015
  MSc in Applied MathematicsUniversity of Bucharest
• 2010–2013
  BSc in Pure MathematicsUniversity of Bucharest