Vol. 46 No. 1 (2026): Special Issue for the 19th Conference on Modelling Fluid Flow (CMFF'25)

This volume of the European Journal of Engineering Mechanics contains select papers presented at the 19th event of the international conference series on fluid flow technologies, the Conference on Modelling Fluid Flow (CMFF’25). It took place in Budapest (Hungary) between Aug. 26th and 29th, 2025, with more than 150 participants from 15 countries. The next event is scheduled for the end of August 2028. Please bookmark https://www.cmff.hu or sign up for the mailing list via email (cmff@gpk.bme.hu) if you would like to be kept informed.

As its title suggests, the conference covers all fields of fluid mechanics. Key results from theoretical, numerical, as well as experimental studies have been presented in Budapest, with the most significant papers being invited for journal publication. The present special issue reveals the complex nature of fluid flows, particularly those that are intrinsically multi-scale and involve multi-physics. The thirteen papers contained in this issue span fundamental studies of fluid dynamics from micro-scale (such as micro-bubbles) up to full-scale applications (such as quadcopters and pump tribology). Single-phase and two-phase flows, heat transfer, and even chemical reactions are considered. Of course, suitable models must be developed and validated, particularly those regarding turbulence – as this question remains one of the most intriguing topics of fluid dynamics.

We hope that you enjoy reading the content!
Dominique Thévenin, János Vad, Csaba Horváth, Esztella Balla and Gábor Janiga

Content:

1. An experimental study with high-speed PIV to characterize the laminar - turbulent transition in helically coiled reactors (Conrad Müller, Péter Kováts, Dominique Thévenin and Katharina Zähringer)
2. Numerical investigation of a lifted methane/air jet flame using stochastic map-based turbulence modeling (Tommy Starick and Heiko Schmidt)
3. Influence of the Reynolds number and the axial fan impeller blade angle on the turbulent swirling jet flow (Novica Z. Jankovic, Đorđe S. Čantrak, Dejan B. Ilić, Miloš S. Nedeljković)
4. Development of a cylindrical-blade wind turbine driven by a necklace vortex (Tsutomu Takahashi, Ryuga Sadaoka and Yasunori Sato)
5. CFD modelling of the thermo- and hydrodynamic capabilities of long-necked plesiosaurs (Miguel Marx, Róbert-Zoltán Szasz and Johan Lindgren)
6. Quantitative analysis of surface mode oscillations of acoustically excited microbubbles (Dániel Nagy, Péter Kalmár, Kálmán Klapcsik and Ferenc Hegedűs)
7. Cavitation bubble near a wall: Sensitivity to modeling conditions (Bo Wang, Zhidian Yang and Francesco Romanò)
8. Enhanced LES-based turbulent subcooled flow boiling prediction (Hanan Aburema, Bruce C. Hanson, Michael Fairweather and Marco Colombo)
9. LES and DES of flow and ice accretion on wind turbine blades (Johan Revstedt, Robert Szász, and Stefan Ivanell)
10. Numerical study of liquid embolization in intravascular treatment using a moving particle semi-implicit method (Takuya Natsume, Marie Oshima, and Nobuhiko Mukai)
11. Analysis of externally excited nonlinear Mathieu equation model for floating bodies (Erik Silva Fujiyama, Josh Davidson and Tamás Kalmár-Nagy)
12. Definition and computation of a flutter safety margin for quadcopters by chained 2-DOF aeroelastic models (Dávid András Horváth, János Lelkes, Balázs Farkas and Tamás Kalmár-Nagy)
13. Design and validation of a pump test rig for tribological and thermal analysis of mechanical seals toward condition monitoring development (David Heel, Peter Meusburger, Helmut Benigni, Johannes Bauer, Ferdinand Werdecker and Maximilian Raith)