Reconstructing the time evolution of wall-bounded turbulent flows from non-time-resolved PIV measurements
C. Vamsi Krishna, Mengying Wang, Maziar S. Hemati, Mitul Luhar
Abstract
Laboratory Particle Image Velocimetry (PIV) systems are often limited in their ability to resolve broadband spatio-temporal fluctuations in turbulent flows due to hardware constraints. Here we develop linear models to reconstruct the time evolution of wall-bounded turbulent flows from non-time resolved PIV snapshots. These models are integrated forward and backward in time using the snapshots as initial conditions, and the resulting predictions fused. This retains small-scale fluctuations in the flow field and resolves velocity spectra at frequencies higher than the system Nyquist limit.
Topics & Concepts
TurbulenceDiscretizationFlow (mathematics)Lorenz systemTime evolutionDistortion (music)Noise (video)Vector fieldPhysicsAlgorithmMathematicsMathematical analysisComputer scienceMechanicsComputer visionImage (mathematics)AttractorAmplifierQuantum mechanicsOptoelectronicsCMOSFluid Dynamics and Turbulent FlowsWind and Air Flow StudiesMeteorological Phenomena and Simulations