no code implementations • 21 Jan 2024 • Xin-Yang Liu, Dariush Bodaghi, Qian Xue, Xudong Zheng, Jian-Xun Wang
Despite extensive research on the kinematics and hydrodynamics of fish locomotion, the intricate control strategies in fin-ray actuation remain largely unexplored.
no code implementations • 30 Dec 2023 • Deepak Akhare, Tengfei Luo, Jian-Xun Wang
Addressing this gap, we introduce a novel method, DiffHybrid-UQ, for effective and efficient uncertainty propagation and estimation in hybrid neural differentiable models, leveraging the strengths of deep ensemble Bayesian learning and nonlinear transformations.
no code implementations • 14 Nov 2023 • Han Gao, Xu Han, Xiantao Fan, Luning Sun, Li-Ping Liu, Lian Duan, Jian-Xun Wang
A notable feature of our approach is the method proposed for long-span flow sequence generation, which is based on autoregressive gradient-based conditional sampling, eliminating the need for cumbersome retraining processes.
no code implementations • 13 Nov 2023 • Deepak Akhare, Zeping Chen, Richard Gulotty, Tengfei Luo, Jian-Xun Wang
Due to the complexities and limited experimental data of the isothermal CVI densification process, we have developed a data-driven predictive model using the physics-integrated neural differentiable (PiNDiff) modeling framework.
1 code implementation • 26 Nov 2022 • Han Gao, Xu Han, Jiaoyang Huang, Jian-Xun Wang, Li-Ping Liu
Recently the Transformer structure has shown good performances in graph learning tasks.
no code implementations • 25 Oct 2022 • Pu Ren, Chengping Rao, Su Chen, Jian-Xun Wang, Hao Sun, Yang Liu
In this paper, we present a novel physics-informed neural network (PINN) model for seismic wave modeling in semi-infinite domain without the nedd of labeled data.
1 code implementation • 14 Oct 2022 • Luning Sun, Daniel Zhengyu Huang, Hao Sun, Jian-Xun Wang
The equation residuals are used to inform the spline learning in a Bayesian manner, where approximate Bayesian uncertainty calibration techniques are employed to approximate posterior distributions of the trainable parameters.
1 code implementation • 2 Aug 2022 • Pu Ren, Chengping Rao, Yang Liu, Zihan Ma, Qi Wang, Jian-Xun Wang, Hao Sun
High-fidelity simulation of complex physical systems is exorbitantly expensive and inaccessible across spatiotemporal scales.
no code implementations • 26 May 2022 • Fangzheng Sun, Yang Liu, Jian-Xun Wang, Hao Sun
The key concept is to interpret mathematical operations and system state variables by computational rules and symbols, establish symbolic reasoning of mathematical formulas via expression trees, and employ a Monte Carlo tree search (MCTS) agent to explore optimal expression trees based on measurement data.
1 code implementation • 9 May 2022 • Xin-Yang Liu, Min Zhu, Lu Lu, Hao Sun, Jian-Xun Wang
Traditional data-driven deep learning models often struggle with high training costs, error accumulation, and poor generalizability in complex physical processes.
no code implementations • 11 Apr 2022 • Pan Du, Xiaozhi Zhu, Jian-Xun Wang
An efficient supervised learning solution is proposed to map the geometric inputs to the hemodynamics predictions in latent spaces.
no code implementations • ICLR 2022 • Xu Han, Han Gao, Tobias Pfaff, Jian-Xun Wang, Li-Ping Liu
Graph-based next-step prediction models have recently been very successful in modeling complex high-dimensional physical systems on irregular meshes.
no code implementations • 31 Jul 2021 • Xin-Yang Liu, Jian-Xun Wang
Model-based reinforcement learning (MBRL) is believed to have much higher sample efficiency compared to model-free algorithms by learning a predictive model of the environment.
Model-based Reinforcement Learning reinforcement-learning +1
1 code implementation • 15 Jan 2020 • Luning Sun, Jian-Xun Wang
In many applications, flow measurements are usually sparse and possibly noisy.
Computational Physics Data Analysis, Statistics and Probability Fluid Dynamics
no code implementations • 19 Aug 2018 • Jian-Xun Wang, Junji Huang, Lian Duan, Heng Xiao
This study demonstrates that the PIML approach is a computationally affordable technique for improving the accuracy of RANS-modeled Reynolds stresses for high-Mach-number turbulent flows when there is a lack of experiments and high-fidelity simulations.
BIG-bench Machine Learning Physics-informed machine learning
1 code implementation • 24 Jan 2017 • Jian-Xun Wang, Jin-Long Wu, Julia Ling, Gianluca Iaccarino, Heng Xiao
In this work, we introduce the procedures toward a complete PIML framework for predictive turbulence modeling, including learning Reynolds stress discrepancy function, predicting Reynolds stresses in different flows, and propagating to mean flow fields.
Fluid Dynamics