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2020 (v1)PublicationUploaded on: April 14, 2023
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2023 (v1)Publication
With the aim of improving the predicting capability of current correlation-based transition models, a new correlation for transition in separated flows is presented, which is based only on local quantities. The peak value of the vorticity-based Reynolds number at the detachment position has been chosen as a local indicator of the boundary layer...
Uploaded on: February 4, 2024 -
2023 (v1)Publication
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Uploaded on: February 4, 2024 -
2022 (v1)Publication
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Uploaded on: February 14, 2024 -
2024 (v1)Publication
This work presents a machine-learning (ML) strategy for the identification of the design region that guarantees minimum losses for Low Pressure Turbine (LPT) blades, allowing the definition of the optimal blade shape. The data-driven procedure is twofold. Firstly, an advanced loss-correlation model (M1) that describes the LPT efficiency as a...
Uploaded on: July 3, 2024 -
2020 (v1)Publication
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Uploaded on: April 14, 2023 -
2020 (v1)Publication
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Uploaded on: April 14, 2023 -
2021 (v1)Publication
A combination of the Linear Stochastic Estimation (LSE) and a modified version of the Extended Proper Orthogonal Decomposition (EPOD) is proposed to link multi-plane particle image velocimetry (PIV) data describing transitional separated boundary layers. Measurements have been obtained in two orthogonal planes, which share a common line...
Uploaded on: April 14, 2023 -
2021 (v1)Publication
A different version of the classic proper orthogonal decomposition (POD) procedure introducing spatial and temporal weighting matrices is proposed. Furthermore, a newly defined non-Euclidean (NE) inner product that retain similarities with the POD is introduced in the paper. The aim is to emphasize fluctuation events localized in...
Uploaded on: April 14, 2023 -
2021 (v1)Publication
The transition process of the boundary layer developing over a flat plate with elevated inlet Free Stream Turbulence Intensity (FSTI) has been studied by means of Large Eddy Simulation (LES). To this purpose, four cases with different inflow disturbances have been tested varying the magnitude and the length scale of turbulence. LES has been...
Uploaded on: March 27, 2023 -
2022 (v1)Publication
Boundary layer receptivity to free-stream disturbances plays a crucial role in forming coherent structures, whose breakup drives the laminar to turbulent flow transition. In the present work, an extended proper orthogonal decomposition (E-POD) procedure is applied to particle image velocimetry (PIV) data to identify correlating events between...
Uploaded on: January 31, 2024 -
2021 (v1)Publication
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Uploaded on: February 14, 2024 -
2023 (v1)Publication
The bursting phenomenon consists in the switch of a laminar separation bubble from a short to a long configuration. In the former case, reduced effects on the profile pressure distribution are typically observed with respect to the attached condition. On the contrary, long bubbles provoke significant variations of the loading coefficient...
Uploaded on: February 4, 2024 -
2024 (v1)Publication
The bursting phenomenon consists in the switch of a laminar separation bubble from a short to a long configuration. In the former case, reduced effects on profile pressure distribution are typically observed with respect to the attached condition. On the contrary, long bubbles provoke significant variations in the loading coefficient upstream...
Uploaded on: July 3, 2024 -
2023 (v1)Publication
This work investigates the statistical response of short and long laminar separation bubbles to external flow parameters, such as Reynolds number, free-stream turbulence intensity and streamwise pressure gradient, known to govern bubble formation and characteristics. A parametric experimental campaign has been performed using particle image...
Uploaded on: July 3, 2024 -
2021 (v1)Publication
The increasing performance of modern aeroengines led the research towards the optimization of machine components not deeply analyzed in the past. In this context, the mechanisms driving the interaction process between the secondary flows evolving at the hub of low-pressure turbines with the rotor-stator cavity systems have been poorly...
Uploaded on: April 14, 2023 -
2022 (v1)Publication
In the present work linear and non-linear regression functions have been tuned with an extensive database describing the unsteady aerodynamic efficiency of low-pressure-turbine cascades. The learning strategy has been first defined using a dataset published in a previous work concerning the loss coefficient measured in a large-scale cascade for...
Uploaded on: February 7, 2024 -
2021 (v1)Publication
A constitutive law for the Reynolds stresses during boundary layer laminar-to-turbulent transition, constructed in previous work by elastic-net regression on an experimental data base, has been incorporated in an algebraic intermittency model. The objective is prediction improvement of transition in a separated layer under an elevated...
Uploaded on: October 11, 2023 -
2017 (v1)Publication
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Uploaded on: April 14, 2023 -
2020 (v1)Publication
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Uploaded on: April 14, 2023