Mean flow data assimilation based on physics-informed neural networks

JGR von Saldern, JM Reumschüssel, TL Kaiser… - Physics of …, 2022 - pubs.aip.org
Physics-informed neural networks (PINNs) can be used to solve partial differential equations
(PDEs) and identify hidden variables by incorporating the governing equations into neural …

Modal decomposition of the precessing vortex core in a hydro turbine model

I Litvinov, D Sharaborin, E Gorelikov, V Dulin… - Applied Sciences, 2022 - mdpi.com
We report on the experimental study of a precessing vortex core (PVC) in an air model of a
Francis turbine. The focus is placed on the modal decomposition of the PVC that occurs in …

Advanced identification of coherent structures in swirl-stabilized combustors

M Sieber, C Oliver Paschereit… - … of Engineering for …, 2017 - asmedigitalcollection.asme.org
We present an application of a newly introduced method to analyze the time-resolved
experimental data from the flow field of a swirl-stabilized combustor. This method is based …

Dynamics of robust structures in turbulent swirling reacting flows

S Roy, T Yi, N Jiang, GH Gunaratne… - Journal of Fluid …, 2017 - cambridge.org
High-speed synchronized stereo particle-imaging velocimetry and OH planar laser-induced
fluorescence (PIV/OH-PLIF) measurements are performed on multiple) respectively. Planar …

An assessment of turbulence models for linear hydrodynamic stability analysis of strongly swirling jets

L Rukes, CO Paschereit, K Oberleithner - European Journal of Mechanics-B …, 2016 - Elsevier
Linear stability analysis has proven to be a useful tool in the analysis of dominant coherent
structures, such as the von Kármán vortex street and the global spiral mode associated with …

Measurement of the fluctuating temperature field in a heated swirling jet with BOS tomography

HM Lang, K Oberleithner, CO Paschereit, M Sieber - Experiments in Fluids, 2017 - Springer
This work investigates the potential of background-oriented schlieren tomography (3D-BOS)
for the temperature field reconstruction in a non-isothermal swirling jet undergoing vortex …

Stochastic modelling of a noise-driven global instability in a turbulent swirling jet

M Sieber, CO Paschereit… - Journal of Fluid …, 2021 - cambridge.org
A method is developed to estimate the properties of a global hydrodynamic instability in
turbulent flows from measurement data of the limit-cycle oscillations. For this purpose, the …

Helical modes in low-and high-swirl jets measured by tomographic PIV

DM Markovich, VM Dulin, SS Abdurakipov… - Journal of …, 2016 - Taylor & Francis
We report on a parallel study on properties of large-scale vortical structures in low-and high-
swirl turbulent jets by means of the time-resolved tomographic particle image velocimetry …

Receptivity of the turbulent precessing vortex core: synchronization experiments and global adjoint linear stability analysis

JS Müller, F Lückoff, P Paredes, V Theofilis… - Journal of Fluid …, 2020 - cambridge.org
The precessing vortex core (PVC) is a coherent structure that can arise in swirling jets from a
global instability. In this work, the PVC is investigated under highly turbulent conditions. The …

Experimental investigation on the effects of swirl in the initial region of isothermal free swirling jets by stereoscopic PIV

R Sharma, F Cozzi - Meccanica, 2023 - Springer
Swirling jets are characterized by having a velocity component in the azimuthal direction
and used in many technical applications eg gas turbines, vortex burners, furnaces, and jet …