123 citations · 548 across the 21 of their papers we have counts for
23 papers
Addressing A Posteriori Performance Degradation in Neural Network Subgrid Stress Models
Andy Wu, Sanjiva K. Lele
Neural network subgrid stress models often have a priori performance that is far better than the a posteriori performance, leading to neural network models that look very promising…
Subgrid Stress Modelling with Multi-dimensional State Space Sequence Models
Andy Wu, Sanjiva K. Lele
Large Eddy Simulations (LES) are becoming increasingly viable due to the growth in computational power the last few decades, and subgrid stress modelling plays a large role in the…
Analysis of Resonance in Jet Screech with Large-Eddy Simulations
Gao Jun Wu, Sanjiva K. Lele, Jinah Jeun
Screech resonance is studied with experimentally validated large-eddy simulation data for a 4:1 rectangular under-expanded jet at three nozzle pressure ratios. The analysis uses sp…
Airfoil trailing-edge noise source identification using large-eddy simulation and wavelet transform
Seongkyu Lee, Donghun Kang, Davy Joao Etienne Brouzet +1
Airfoil noise is predicted and analyzed using wall-resolved large-eddy simulations and wavelet transforms for a NACA 0012 airfoil at a Mach number of 0.06 and a Reynolds number of…
A closure mechanism for screech coupling in rectangular twin jets
Jinah Jeun, Gao Jun Wu, Sanjiva K. Lele
Twin-jet configuration allows two different scenarios to close the screech feedback. For each jet, there is one loop involving disturbances which originate in that jet and arrive a…
Analysis of second-moments and their budgets for Richtmyer-Meshkov instability and variable-density turbulence induced by re-shock
Man Long Wong, Jon R. Baltzer, Daniel Livescu +1
Nonlinear Richtmyer--Meshkov instability and mixing transition induced by a Mach 1.45 shock and subsequent re-shock at an interface between two ideal gases (sulfur hexafluoride and…
Assessment of diffuse-interface methods for compressible multiphase fluid flows and elastic-plastic deformation in solids
Suhas S. Jain, Michael C. Adler, Jacob R. West +3
This work describes three diffuse-interface methods for the simulation of immiscible, compressible multiphase fluid flows and elastic-plastic deformation in solids. The first metho…
Aeroacoustics of Twin Rectangular Jets Including Screech: Large-eddy Simulations with Experimental Validation
Jinah Jeun, Aatresh Karnam, Gao Jun Wu +3
High-fidelity large-eddy simulations (LES) are performed to investigate aeroacoustic characteristics of jets issuing from twin rectangular nozzles with an aspect ratio of 2:1 at tw…
Scalable Parallel Linear Solver for Compact Banded Systems on Heterogeneous Architectures
Hang Song, Kristen V. Matsuno, Jacob R. West +3
A scalable algorithm for solving compact banded linear systems on distributed memory architectures is presented. The proposed method factorizes the original system into two levels…
The subgrid scale pressure field of scale-enriched Large Eddy Simulations using Gabor modes
Ryan D. Hass, Aditya S. Ghate, Sanjiva K. Lele
With the continuing progress in large eddy simulations (LES), and ever increasing computational resources, it is currently possible to numerically solve the time-dependent and anis…
Drag of a Heated Sphere at Low Reynolds Numbers in the Presence of Buoyancy
Swetava Ganguli, Sanjiva K. Lele
Fully resolved simulations are used to quantify the effects of heat transfer in the presence of buoyancy on the drag of a spatially fixed heated spherical particle at low Reynolds…
Turbulence Enrichment using Physics-informed Generative Adversarial Networks
Akshay Subramaniam, Man Long Wong, Raunak D Borker +2
Generative Adversarial Networks (GANs) have been widely used for generating photo-realistic images. A variant of GANs called super-resolution GAN (SRGAN) has already been used succ…
Homogenized Flux-Body Force Treatment of Compressible Viscous Porous Wall Boundary Conditions
Daniel Z. Huang, Man Long Wong, Sanjiva K. Lele +1
A homogenization approach is proposed for the treatment of porous wall boundary conditions in the computation of compressible viscous flows. Like any other homogenization approach,…
High-resolution Navier-Stokes simulations of Richtmyer-Meshkov instability with re-shock
Man Long Wong, Daniel Livescu, Sanjiva K. Lele
The interaction of a Mach 1.45 shock wave with a perturbed planar interface between sulphur hexafluoride and air is studied through high-resolution two-dimensional (2D) and three-d…
A High-Order Weighted Compact High Resolution Scheme with Boundary Closures for Compressible Turbulent Flows with Shocks
A. Subramaniam, M. L. Wong, S. K. Lele
We present an improved high-order weighted compact high resolution (WCHR) scheme that extends the idea of weighted compact nonlinear schemes (WCNS's) using nonlinear interpolations…
High-Order Localized Dissipation Weighted Compact Nonlinear Scheme for Shock- and Interface-Capturing in Compressible Flows
M. L. Wong, S. K. Lele
Simulations of single- and multi-species compressible flows with shock waves and discontinuities are conducted using a weighted compact nonlinear scheme (WCNS) with a newly develop…
Linear and Nonlinear Modeling of a Traveling-Wave Thermoacoustic Heat Engine
Carlo Scalo, Sanjiva K. Lele, Lambertus Hesselink
We have carried out three-dimensional Navier-Stokes simulations, from quiescent conditions to the limit cycle, of a traveling-wave thermoacoustic heat engine (TAE) composed of a lo…
On the Richtmyer-Meshkov instability evolving from a deterministic multimode planar interface
V. K. Tritschler, B. J. Olson, S. K. Lele +3
We investigate the shock-induced turbulent mixing between a light and heavy gas, where a Richtmyer-Meshkov instability (RMI) is initiated by a $\Ma = 1.5$ shock wave. The prescribe…
The Shock and the Turbulence: the story of an interaction
Ivan Bermejo-Moreno, Johan Larsson, Sanjiva K. Lele
Video highlighting multiple features of the interaction between isotropic turbulence and a nominally planar shock wave, normal to the mean flow direction. The visualizations showca…
Ubiquitous Solar Eruptions Driven by Magnetized Vortex Tubes
I. N. Kitiashvili, A. G. Kosovichev, S. K. Lele +2
The solar surface is covered by high-speed jets transporting mass and energy into the solar corona and feeding the solar wind. The most prominent of these jets have been known as s…
Turbulent Kinetic Energy Spectra of Solar Convection from NST Observations and Realistic MHD Simulations
I. N. Kitiashvili, V. I. Abramenko, P. R. Goode +5
Turbulent properties of the quiet Sun represent the basic state of surface conditions, and a background for various processes of solar activity. Therefore understanding of properti…
Vortex Tubes of Turbulent Solar Convection
I. N. Kitiashvili, A. G. Kosovichev, N. N. Mansour +2
Investigation of the turbulent properties of solar convection is extremely important for understanding the multi-scale dynamics observed on the solar surface. In particular, recent…
Large-Eddy Simulation of an over-expanded planar nozzle
Britton J. Olson, Sanjiva K. Lele
This fluid dynamics video shows visualizations of a Large-Eddy Simulation (LES) of an over-expanded planar nozzle. This configuration represents the experimental setup of Papamosch…