Announcement Detail
November 4, 2025, 8–9 PM New York (EST) / November 5, 2025, 9–10 AM Hong Kong (HKT)
Join via Zoom: https://us06web.zoom.us/j/89539956799?pwd=BTTnLKm6F28rRrcbTvBUkywQGfpgb2.1 (Meeting ID: 895 3995 6799; Passcode: 242578)
Math Methods Asia-USA Seminar Series
Main organizer: Gianmarco Mengaldo (National University of Singapore)
Physics and modeling of hypersonic wall-bounded turbulent flows
Speaker
Dr. Lin Fu, Hong Kong University of Science and Technology
Abstract:
In this work, we will report our progress in understanding and modeling of hypersonic wall-bounded turbulence. Particular attention will be given to the scalings of mean velocity, temperature and skin friction coefficient, as well as the advanced wall-modeled large-eddy simulation (WMLES) framework. We will show how the new wall models substantially improve the prediction accuracy of classical ones when coupled with the novel high-order numerical methods (e.g., the high-order TENO schemes).
Bio:
Prof. Fu is an Assistant professor in the Department of Mechanical and Aerospace Engineering and the Department of Mathematics at the Hong Kong University of Science and Technology (HKUST). Before he joined HKUST, he was a postdoctoral fellow working with Prof. Parviz Moin at Center for Turbulence Research (CTR), Stanford University, for more than 3 years and he also did postdoctoral research with Prof. Nikolaus A. Adams in Technical University of Munich (TUM), where he obtained his Ph.D. degree with a grade of Summa Cum Laude (passed with the highest distinction). He was recognized with the Early Career Award by the Research Grants Council (RGC) of Hong Kong in 2022 and the National Natural Science Fund for Excellent Young Scientists by NSFC in 2024 (国家优秀青年科学基金). He was elected to receive the 19th Youth Science and Technology Award of The Chinese Society of Theoretical and Applied Mechanics (CSTAM) in 2025. He is the Editorial Board Member (Early Career member) of Physical Review Fluids (PRF) and the Associate Editor of Advances in Applied Mathematics and Mechanics (AAMM). He has published around 100 papers in prestigious international journals, including PNAS, JFM, PRF, JCP, CMAME, etc.
Differentiable Physics: A physics-constrained and data-driven paradigm for scientific machine learning
Speaker
Dr. Romit Maulik, Pennsylvania State University
Abstract:
Machine learning stands poised to revolutionize the process of scientific discovery across various disciplines. In this talk, we will introduce a state-of-the-art scientific machine learning paradigm - differentiable physics (DiffPhys). DiffPhys can be considered a system identification paradigm that can be applied to determine neural network approximations of governing laws given data. It can also be used to improve first-principles-based simulations of physical phenomena by learning corrections to governing laws (for instance for closure modeling in multiscale applications). Notably, optimizing these neural networks necessitates a differentiable programming paradigm where gradients of a loss function can be propagated through a numerical solver. In this talk, we will introduce DiffPhys algorithms that (1) can learn models for dynamical systems from sparse data, (2) efficiently compute sensitivities for systems exhibiting deterministic chaos, and (3) provide physically meaningful interpretations for neural network behavior thereby engendering scientific discovery. We will demonstrate the capabilities of DiffPhys on canonical and realistic scientific computing problems and close with a discussion of the future possibilities of this approach.
Bio:
Romit Maulik is an Assistant Professor in the College of Information Sciences and Technology at Pennsylvania State University (Penn State). He is also a co-hire in the Institute for Computational and Data Sciences at Penn State and a Joint Appointment Faculty at Argonne National Laboratory. He obtained his PhD in Mechanical and Aerospace Engineering at Oklahoma State University (in 2019) and was the Margaret Butler Postdoctoral Fellow (from 2019-2021) before becoming an Assistant Computational Scientist at Argonne National Laboratory (from 2021-2023). His group studies high-performance multifidelity scientific machine learning algorithm development with applications to various multiphysical nonlinear dynamical systems such as those that arise in fluid dynamics, geophysical modeling, nuclear fusion, and beyond. He is an Early Career Awardee of the Army Research Office.