Tony Zahtila

Assessment and calibration of RANS turbulence models for buoyancy-driven flows using ensemble Kalman filters

Jiyoung Lee, Tony Zahtila, Wilson Lu, Leon Chan et autres

Turbulence modelling of buoyancy-dominated flows is challenging due to the complex coupling of the velocity and temperature fields. Higher-order and nonlinear models have been developed to more accurately represent the underlying physics, however, they still lack universality and usually result in complicated …

au, us (code pays fourni par la source)

Erratum: GPU-accelerated simulations of turbulence: Review of current applications and future perspectives [Phys. Rev. Fluids 11 , 034905 (2026)]

Alessio Roccon, Giorgio Amati, Luca Brandt, Donna A. Calhoun et autres

Generative prediction of laser-induced rocket ignition with dynamic latent space representations

Tony Zahtila, Ettore Saetta, Murray Cutforth, Davy J. Brouzet et autres

Accurate and predictive scale-resolving simulations of laser-ignited rocket engines are highly time-consuming because the problem includes turbulent fuel-oxidizer mixing dynamics, laser-induced energy deposition, and high-speed flame growth. This is conflated with the large design space primarily corresponding to the laser operating conditions …

Generative prediction of laser-induced rocket ignition with dynamic latent space representations

Tony Zahtila, Ettore Saetta, Murray Cutforth, Davy J. Brouzet et autres

Accurate and predictive scale-resolving simulations of laser-ignited rocket engines are highly time-consuming because the problem includes turbulent fuel-oxidizer mixing dynamics, laser-induced energy deposition, and high-speed flame growth. This is conflated with the large design space primarily corresponding to the laser operating conditions …

GPU-accelerated simulations of turbulence: Review of current applications and future perspectives

Alessio Roccon, Giorgio Amati, Luca Brandt, Donna A. Calhoun et autres

The growing availability of GPU-accelerated open-source solvers has boosted the capability of tackling complex single-phase and multiphase turbulent flows by means of direct and large-eddy simulations. GPU-accelerated solvers can leverage the heterogeneous computing architectures that are available in leading high-performance computing centers …

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Multi-fidelity Data Ensembles of Liquid Phase Rocket Ignition: Ignition Limit States and Reliability

Alboreno Voci, Henry Collis, Tony Zahtila, Davy J. Brouzet et autres

To understand the reliability of successful ignition through use of laser energy deposition for a liquid-oxygen gaseous-methane rocket combustor, we conduct large-eddy simulations (LESs). We first ensure that pre-ignition flow statistics accurately reproduce companion experimental measurements conducted at Purdue University. With satisfactory …

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Bi-fidelity interpolative decomposition for multimodal data

Murray Cutforth, Tiffany Fan, Tony Zahtila, Alireza Doostan et autres

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An autoencoder-based bi-fidelity method utilising frozen latent spaces. Application to flow past a confined cylinder

Wilson Lu, Wai Kit Lam, Tony Zahtila

This study presents a simple autoencoder-based bi-fidelity method, where the latent space is constrained to be invariant between both low- and high-fidelity datasets. The method is applied to the flow past a cylinder confined in a duct, where model fidelity is governed …

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Thermal expansion-driven laser ignition in a gas subscale rocket combustor

Davy J. Brouzet, Diego Rossinelli, Tony Zahtila, Alboreno Voci et autres

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Video: Laser-Driven Ignition in a Subscale Rocket Combustor

Alboreno Voci, Davy J. Brouzet, Tony Zahtila, Alexander M. Warner et autres

Bi-fidelity Interpolative Decomposition for Multimodal Data

Murray Cutforth, Tiffany Fan, Tony Zahtila, Alireza Doostan et autres

Multi-fidelity simulation is a widely used strategy to reduce the computational cost of many-query numerical simulation tasks such as uncertainty quantification, design space exploration, and design optimization. The reduced basis approach based on bi-fidelity interpolative decomposition is one such approach, which identifies …

Modeling of uncertainties from spanwise asymmetries in upstream conditions and measurement plane location for flow past a circular cylinder confined within a duct

Wilson Lu, Tony Zahtila, Leon Chan, Quang Duy Nguyen et autres

This study numerically investigates two sources of uncertainties that may influence measurements of flow past a circular cylinder confined in a duct. These being spanwise asymmetries in upstream profiles and measurement plane location. We find variations in upstream profiles strongly affects wake …

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