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Data processing and visualization I
Identification of an actuation manifold for open-loop control of subsonic jets with acoustic-based excitation
Luca Franceschelli, Marco Raiola, Andrea Ianiro, Stefano Discetti
Abstract: This study aims to identify a low-order model for a jet with acoustic-based open-loop control. The jet response to the forcing is measured via phase-locked Particle Image Velocimetry. Nonlinear manifold learning based on the isometric mapping technique is used to reveal the low-dimensional actuation manifold. Complementary pressure measurements in the shear layer and far field highlight the actuation’s impact on jet dynamics and acoustic emission.
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Background Oriented Schlieren of non-ideal compressible flows
Alessio Secchiaroli, Carlo De Servi, Chiara Falsetti, Adam Head, Piero Colonna
Abstract: This work provides an extensive explanation of the strategy for successfully applying the Background Oriented Schlieren technique to a supersonic flow of organic vapor, obtaining quantitative information about the density gradient.
The project was carried out in the ORCHID facility installed in the High Speed Lab at TU Delft.
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Analysis of Non-Newtonian Ink Transfer in Offset Printing using AI interpolation
Mohammad Nazemi babadi, Suhwan Lee, Eunseop Yeom
Abstract: This research investigates the ink transfer process in offset printing with a focus on the behavior of non-Newtonian fluids. Simulations were conducted using OpenFOAM software, employing the Carreau model to characterize the non-Newtonian viscosity and the volume of fluid (VOF) method to track the air-ink interface. The effects of critical parameters, such as contact angles, Reynolds number (Re), and Capillary number (Ca), on break time (BT) and ink transfer ratio (TR) were analyzed. Results show that contact angle has the most substantial impact on ink transfer, with a 44% reduction in TR observed when the top plate angle increases from 15° to 75°. To establish contact angle relationships for BT and TR varying Re and Ca, artificial intelligence (AI) interpolation was applied. Optimization of the ink transfer process was carried out using response surface methodology, offering effective solutions to enhance performance.
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