In July 2025, three members of the FELiCS community — Lukas, Jens, and Simon — travelled to Cagliari for the ERCOFTAC SIG33 workshop on flow instability and control. The meeting gathered researchers from across Europe and beyond, offering an excellent opportunity to exchange the latest ideas, methods, and results in hydrodynamic stability and flow control. It was also a chance to strengthen ongoing collaborations with several of our international partners working on FELiCS-related topics.
All three presentations showcased current developments within the FELiCS ecosystem:
- Jens presented “Linear Stability and Shape Sensitivity Analysis with a Linearized Turbulence Model for Shape Optimization”, highlighting recent advances in turbulence-model-aware sensitivity formulations.
- Lukas shared his work on “Linear Modeling and Control of Standing-Wave Low-Frequency Dynamics of a Turbulent Separation Bubble”, demonstrating FELiCS-based tools for reduced-order modelling and control design.
- Simon discussed “Gradient-Augmented Bayesian Shape Optimization for Flow Instability Control Using Linearized Navier–Stokes Models”, combining FELiCS gradients with Bayesian optimisation strategies.
A special mention goes to Lukas, who returned to Berlin entirely by boat and train, making this the most environmentally friendly trip among us — and fully in the spirit of sustainable scientific travel.
The workshop was a stimulating and productive experience, and we look forward to bringing the new ideas and collaborations back into the continued development of FELiCS.