88 citations · 137 across the 17 of their papers we have counts for
17 papers
Optimization-Based Discovery of A Non-Attracting Flow State in An Oscillating-Cylinder Wake
Daiwei Dong, Wenbo Cao, Wei Suo +2
In the flow past a stationary circular cylinder, the classical Karman vortex street arises from a Hopf bifurcation of the steady flow at the critical Reynolds number. Although this…
A High-Order Immersed Boundary Method for Fluid-Structure Interaction Problems
Yingjie Xia, Stefano Colombo, David Huergo +3
Accurate and efficient simulation of fluid-structure interaction (FSI) problems remains a central challenge in computational physics. High-order discontinuous Galerkin (DG) methods…
Goal-oriented Feature Extraction: a novel approach for enhancing data-driven surrogate model
Xu Wang, Ruiqi Huang, Jiaqing Kou +2
Surrogate model can replace the parametric full-order model (FOM) by an approximation model, which can significantly improve the efficiency of optimization design and reduce the co…
PINN-MG: A Multigrid-Inspired Hybrid Framework Combining Iterative Method and Physics-Informed Neural Networks
Daiwei Dong, Wei Suo, Jiaqing Kou +1
Iterative methods are widely used for solving partial differential equations (PDEs). However, the difficulty in eliminating global low-frequency errors significantly limits their c…
A combined volume penalization / selective frequency damping approach for immersed boundary methods: application to moving geometries
Jiaqing Kou, Esteban Ferrer
This work extends, to moving geometries, the immersed boundary method based on volume penalization and selective frequency damping approach [J. Kou, E. Ferrer, A combined volume pe…
A modified equation analysis for immersed boundary methods based on volume penalization: applications to linear advection-diffusion and high-order discontinuous Galerkin schemes
Victor J. Llorente, Jiaqing Kou, Eusebio Valero +1
The Immersed Boundary Method (IBM) is a popular numerical approach to impose boundary conditions without relying on body-fitted grids, thus reducing the costly effort of mesh gener…
Aeroacoustic airfoil shape optimization enhanced by autoencoders
Jiaqing Kou, Laura Botero-Bolívar, Román Ballano +4
We present a framework for airfoil shape optimization to reduce the trailing edge noise for the design of wind turbine blades. Far-field noise is evaluated using Amiet's theory cou…
Jump penalty stabilisation techniques for under-resolved turbulence in discontinuous Galerkin schemes
Jiaqing Kou, Oscar A. Marino, Esteban Ferrer
Jump penalty stabilisation techniques have been recently proposed for continuous and discontinuous high order Galerkin schemes [1,2,3]. The stabilisation relies on the gradient or…
An experimental modal testing method for subcritical flow around a cylinder
Zhen Lyu, Jiaqing Kou, Weiwei Zhang
Modal analysis of fluid flows is essential to understand flow physics and fluid-solid interaction mechanisms, and to implement flow control. Unlike unstable flow, the intrinsic att…
Deep Learning for Multi-Fidelity Aerodynamic Distribution Modeling from Experimental and Simulation Data
Kai Li, Jiaqing Kou, Weiwei Zhang
The wind-tunnel experiment plays a critical role in the design and development phases of modern aircraft, which is limited by prohibitive cost. In contrast, numerical simulation, a…
Experimental study on Vortex-Induced Vibration of Cylinder at Subcritical Reynolds Number
Zhen Lyu, Weiwei Zhang, Jiaqing Kou
Numerical simulation results in recent years show that vortex-induced vibration (VIV) can occur at a subcritical Reynolds number. And the VIV has been observed numerically at Reyno…
A combined volume penalization / selective frequency damping approach for immersed boundary methods applied to high-order schemes
Jiaqing Kou, Esteban Ferrer
There has been an increasing interest in developing efficient immersed boundary method (IBM) based on Cartesian grids, recently in the context of high-order methods. IBM based on v…
Eigensolution analysis of immersed boundary method based on volume penalization: applications to high-order schemes
Jiaqing Kou, Aurelio Hurtado-de-Mendoza, Saumitra Joshi +2
This paper presents eigensolution and non-modal analyses for immersed boundary methods (IBMs) based on volume penalization for the linear advection equation. This approach is used…
Hierarchical construction of higher-order exceptional points
Q. Zhong, J. Kou, S. K. Ozdemir +1
The realization of higher-order exceptional points (HOEPs) can lead to orders of magnitude enhancement in light-matter interactions beyond the current fundamental limits. Unfortuna…
Comparisons of Two Reduced-Order Models for Linearized Unsteady Aerodynamic Identification
Jiaqing Kou, Weiwei Zhang
This paper compares the performance of two unsteady aerodynamic reduced-order models (ROMs), namely linear Volterra series and the autoregressive with exogenous input (ARX) model,…
Machine learning methods for turbulence modeling in subsonic flows over airfoils
Weiwei Zhang, Linyang Zhu, Yilang Liu +1
Reynolds-Averaged Navier-Stokes(RANS) method will still play a vital role in the following several decade in aerospace engineering. Although RANS models are widely used, empiricism…
Mode Multigrid - A novel convergence acceleration method
Yilang Liu, Weiwei Zhang, Jiaqing Kou
This paper proposes a mode multigrid (MMG) method, and applies it to accelerate the convergence of the steady state flow on unstructured grids. The dynamic mode decomposition (DMD)…