Activities in SSECOID are structured in base of 4 technical work-packages
WP1 focuses on aligning research efforts with industrial challenges through five test cases (TCs):
• TC1: McLaren Racing Ltd addressed aerodynamic simulations on a full Formula 1 car, improving meshing, LES methodologies, and stability analysis.
• TC2: DNS/LES studies examined low-pressure turbine blade flow separation and the effects of harmonic inflow and active control strategies.
• TC3: Inkjet printhead optimization models were developed to enhance droplet uniformity and reduce experimental costs.
• TC4: Boundary layer stability was analyzed, focusing on the effects of surface roughness and waviness on turbulence.
• TC5: Aero-vibro-acoustic interactions in confined flows were optimized for noise and vibration control.
WP2 enhances high-order CFD methods for accurate unsteady flow simulations. Advancements include mesh-free Immersed Boundary Methods (IBM) and adaptive mesh refinement (hrp-AMR) for efficient compressible flow modeling. Improved temporal discretization techniques, such as BDF error indicators and implicit schemes, enhance stability and accuracy. IBM has been applied to multi-element configurations, while adaptive meshing improves turbulence detection. Mode decomposition tools and refined Variational Mode Decomposition (VMD) enhance flow analysis. Stability studies on transonic buffet oscillations provide insights into instability mechanisms. These developments optimize CFD simulations, improving aerodynamic performance and control strategies for industrial applications.
WP3 develops numerical tools to analyze the stability and receptivity of 2D and 3D complex flows, particularly in laminar-turbulent transition scenarios. It investigates boundary layer stability under surface irregularities and detached flow stability. Research includes linear stability analysis of secondary instabilities in crossflow-dominated boundary layers, DNS simulations of discrete roughness effects, and optimization of manufacturing tolerances for laminar flow airfoils. Detached flow studies examine boundary layer separation, transonic buffet instability, and key instability mechanisms like vortex shedding. These advancements enhance understanding of aerodynamic performance, transition mechanisms, and flow control strategies, improving aircraft efficiency and reducing drag.
WP4 focuses on developing tools to analyze flow sensitivity and receptivity to external perturbations, enabling effective flow control strategies. T4.1 studied transonic buffet sensitivity, identifying critical flow regions influencing instability onset. Adjoint-based sensitivity analyses were applied to stall cells and low-frequency breathing modes, offering insights into their origins and potential passive control strategies. T4.2 investigated aerodynamic perturbation effects on structural output, improving numerical stability and analyzing the impact of a smooth surface hump on swept-wing boundary layers, demonstrating its potential for delaying transition. T4.3 focused on flow actuation and shape sensitivity, optimizing actuators and developing frameworks for airfoil design.
The project has made significant strides in advancing scientific knowledge, fostering collaboration, and ensuring compliance with the European Commission's Open Science policy, as outlined in Horizon 2020's Open Access requirements. By the official end date, 33 Open Access publications and proceedings were produced, including 8 peer-reviewed articles in international journals, all of which are Open Access. Of these, 5 were published under Gold Open Access, guaranteeing immediate and unrestricted availability. Additionally, 5 peer-reviewed articles are under review, and 11 are in preparation, bringing the total to 24 peer-reviewed journal articles published in prestigious scientific journals such as Journal of Fluid Mechanics, Nature Physics, Journal of Computational Physics, AIAA Journal, Physics of Fluids, and Journal of Fluids and Structures, among others.
