Search Results for author: Jian-Xun Wang

Found 16 papers, 6 papers with code

Asynchronous Parallel Reinforcement Learning for Optimizing Propulsive Performance in Fin Ray Control

no code implementations21 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.

DiffHybrid-UQ: Uncertainty Quantification for Differentiable Hybrid Neural Modeling

no code implementations30 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.

Uncertainty Quantification

Bayesian Conditional Diffusion Models for Versatile Spatiotemporal Turbulence Generation

no code implementations14 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.

Probabilistic Physics-integrated Neural Differentiable Modeling for Isothermal Chemical Vapor Infiltration Process

no code implementations13 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.

Uncertainty Quantification

SeismicNet: Physics-informed neural networks for seismic wave modeling in semi-infinite domain

no code implementations25 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.

Computational Efficiency

Bayesian Spline Learning for Equation Discovery of Nonlinear Dynamics with Quantified Uncertainty

1 code implementation14 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.

Physics-informed Deep Super-resolution for Spatiotemporal Data

1 code implementation2 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.

Super-Resolution

Symbolic Physics Learner: Discovering governing equations via Monte Carlo tree search

no code implementations26 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.

Multi-resolution partial differential equations preserved learning framework for spatiotemporal dynamics

1 code implementation9 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.

Deep learning-based surrogate model for 3-D patient-specific computational fluid dynamics

no code implementations11 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.

Uncertainty Quantification

Predicting Physics in Mesh-reduced Space with Temporal Attention

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.

Decoder

Physics-informed Dyna-Style Model-Based Deep Reinforcement Learning for Dynamic Control

no code implementations31 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

Physics-Constrained Bayesian Neural Network for Fluid Flow Reconstruction with Sparse and Noisy Data

1 code implementation15 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

Prediction of Reynolds Stresses in High-Mach-Number Turbulent Boundary Layers using Physics-Informed Machine Learning

no code implementations19 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

A Comprehensive Physics-Informed Machine Learning Framework for Predictive Turbulence Modeling

1 code implementation24 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

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