Thomas Ludwig Kaiser

I founded the FELiCS project in 2018 and within the first five years, was the main contributor to the software. With the help of Master students, I had the goal to make FELiCS a versatile tool with a broad range of applications - spanning from generic configurations over combustion processes to aviation-related use cases and many more. I am happy, that since the project has grown beyond a one-person effort, and that it has proven valuable to many of my colleagues. Today, my goal regarding FELiCS is to provide a fertile ground for it to grow beyond what it is today, such that it may continue to prove useful to the broader scientific community and industry.

Since 2025, I am having the privilege of leading an Emmy-Noether junior research group at the Institute of Fluid Dynamics and Technical Acoustics at the Technical University of Berlin. The core topics of this project revolve around flame dynamics and thermoacoustic instabilities in laminar and turbulent combustion systems using renewable fuels. FELiCS is at the core of this endeavour and key challenges involve improving turbulence and turbulent flame modelling.

Sophie Knechtel

Simon Demange

Simon joined TU Berlin as a postdoctoral researcher in 2022 and has since been actively contributing to the FELiCS project. Building on the existing foundations of the code, he has focused on further developing its architecture and improving its modularity, mentoring several master’s students and student assistants along the way to help streamline and extend the FELiCS workflow.

His main focus within the project is the development of tools for linear aeroacoustic analysis, including a compressible solver and specialised resolvent restrictors that target acoustically relevant regions of the flow. In parallel, he has also been involved in applications of FELiCS to cardiovascular flow analysis. More recently, he has contributed to the development of shape-optimisation pipelines that enable both gradient-based and Bayesian optimisation loops around FELiCS. Simon has also started to engage in the EU Doctoral Network FairCFD, through which he aims to further advance FELiCS and promote its use and dissemination within a broader research community.

His current research interests centre on airfoil aeroacoustics and hydrogen combustion.

Kilian Oberleithner

I see FELiCS as a uniquely versatile tool that opens exciting possibilities for linear stability and resolvent analysis in complex, reacting, and multiphase flows—far beyond the case-specific approaches often found in our field. The code has been developed within the Laboratory for Flow Instabilities and Dynamics at TU Berlin. While Thomas, a at the time postdoc in the group, brought it to life and was the driving force for its development during its first five years, today the project has evolved into a group project with more than 20 contributors. I am enthusiastic about the vision of a flexible, multifunctional framework, and I mainly support the project by participating in strategic discussions and providing feedback through the scientific work in which we applied FELiCS. I also try to help create an environment—through project ideas and funding opportunities—that allowed the team to push the code and its documentation. Looking ahead, I hope FELiCS will continue to grow through contributions from both the current developers and the broader community. I am especially excited about future directions such as variational data assimilation for closure modeling and mean-field reconstruction, which could help bring experimental, numerical, and theoretical fluid mechanics even closer together.

Anant Rajeev Talasikar

I have joined the Institute for Fluid Mechanics and Technical Acoustics as a doctoral researcher on the IGNITION project, and am extensively developing and using FELiCS in all my projects. I have contributed towards developing the tutorials, the How-Tos as well as testing and validating FELiCS’s functionalities. My research interests are numerical methods for fluid flows, mathematical programming and high performance computing.

Jens Satria Müller

I am a researcher working on linear stability, resolvent, and sensitivity analysis with the aim of advancing physics-based flow control strategies, for example to identify optimal actuator placement for active control or optimal shapes for passive control. At the same time, I am interested in uncovering how instabilities and modes are generated and sustained, and which mechanisms are most affected when control is applied. A central challenge in my research is to apply these linear frameworks to fully turbulent flows, where suitable turbulence models become essential. Applications comprise flows in gas turbines, airfoils and hydrofoils, as well as hydro turbines.

Xiuyang Song

Lukas Maximilian Fuchs

Alexandre Villié

My research employs FELiCS to analyze transitional stenotic flows, focusing on the physical mechanisms behind turbulent wall shear stress. My workflow combines global stability analysis, to identify amplified modes in the mean flow, with resolvent analysis, to study forced responses and energy amplification. This approach reveals the dominant flow structures and instability mechanisms in stenotic geometries.

Marina Matthaiou

Marta Boero

Frederic Lysander Bergner

Alexander Nehls

I'm a student assistant of the subject area turbulent flows at Berlin Institute of Technology. The main focus of my work is the development of FELiCS. I started with reworking the config class of the code. As this part is setting up the parameters for the rest of the run, it is deeply connected to the whole codebase. This way I got a good understanding of the whole FELiCS workflow. I used this for one to work on the overall structure of FELiCS. For another this knowledge was helping me to set up the FELiCS guide. The guide is there to serve developers and people interested in developing as an entry point for getting into the FELiCS development. It lines out the theoretical background alongside code examples to really give an understanding of how FELiCS works. I'm happy to be a part of the FELiCS development and hope to help other people like you getting into it as well. Give it a try!