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Selected Papers from the Conference on Modelling Fluid Flow (CMFF’25)
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Selected Papers from the Conference on Modelling Fluid Flow (CMFF’25)

A special issue of International Journal of Turbomachinery, Propulsion and Power (ISSN 2504-186X).

Deadline for manuscript submissions: closed (2 May 2026) | Viewed by 986

Special Issue Editors

Prof. Dr. János Gábor Vad

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Guest Editor
Department of Fluid Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, 1111 Budapest, Hungary
Interests: turbomachinery design; radial stacking techniques; controlled vortex design; turbomachinery aerodynamics and aeroacoustics
Special Issues, Collections and Topics in MDPI journals
Dr. Csaba Horváth

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Guest Editor
Department of Fluid Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, 1111 Budapest, Hungary
Interests: turbomachinery aerodynamics and aeroacoustics; beamforming
Special Issues, Collections and Topics in MDPI journals
Dr. Esztella Éva Balla

E-Mail Website
Guest Editor
Department of Fluid Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, 1111 Budapest, Hungary
Interests: low speed turbomachinery; vortex shedding phenomena

Special Issue Information

Dear Colleagues,

It is our privilege to present you with the Special Issue “Selected Papers from the Conference on Modelling Fluid Flow (CMFF’25)”. This Special Issue is a collection of the best turbomachinery papers presented at the Conference on Modelling Fluid Flow (CMFF’25) in Budapest, Hungary, between August 26th and 29th 2025 (https://www.cmff.hu/). CMFF’25 is the latest event in the series of international conferences on fluid machinery held in Budapest since 1959.

The aim of CMFF is to respond to challenges in the rapidly developing fields of fluid mechanics: numerical simulation of flows, and physical modelling of flow processes using advanced measurement methods. While the scope of the more recent conferences in the series covers a broader range of key subjects within fluid mechanics, there always has been and always will be a strong turbomachinery presence at the conference, with CMFF’25 being no different.

Prof. Dr. János Gábor Vad
Dr. Csaba Horváth
Dr. Esztella Éva Balla
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. International Journal of Turbomachinery, Propulsion and Power is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • turbomachinery
  • simulation techniques
  • measurement techniques
  • turbines
  • compressors
  • fans
  • cascades
  • propellers

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Published Papers (2 papers)

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Research

17 pages, 20315 KB  
Article
Effect of Surface Grooves and Bars on Gas Accumulation in Diverging Channels Under Two-Phase Flow Conditions
by Michael Mansour, Mena Shenouda, Nicola Zanini and Dominique Thévenin
Int. J. Turbomach. Propuls. Power 2026, 11(2), 26; https://doi.org/10.3390/ijtpp11020026 - 1 Jun 2026
Viewed by 155
Abstract
Two-phase flow in diffusers is often accompanied by pronounced gas accumulation caused by low-pressure regions associated with flow separation, leading to a deterioration in pressure recovery. This behavior poses a major limitation to the performance of centrifugal pumps operating under gas–liquid flow conditions. [...] Read more.
Two-phase flow in diffusers is often accompanied by pronounced gas accumulation caused by low-pressure regions associated with flow separation, leading to a deterioration in pressure recovery. This behavior poses a major limitation to the performance of centrifugal pumps operating under gas–liquid flow conditions. Compared to rotating pump components, diffusers provide a simplified and well-controlled environment, making them particularly suitable for detailed experimental investigations. In this study, the influence of surface geometry modifications on gas accumulation is examined by introducing grooves and bars of different sizes on the upper wall of a diffuser. These structures are intended to enhance local turbulence and promote gas dispersion in regions prone to accumulation. A diffuser with a gradually increasing opening angle was designed to deliberately trigger flow separation and gas entrapment. The two-phase flow behavior was analyzed using high-speed visualizations to capture the interaction between gas and liquid phases under various operating conditions. The results show that small-scale grooves and bars have only a marginal effect on mitigating gas accumulation. In several cases, these modifications intensify flow separation, leading to increased gas hold-up, particularly at low liquid flow rates combined with high gas flow rates. In contrast, larger bars, especially the largest tested configuration, demonstrate a pronounced ability to reduce gas accumulation, most notably at higher liquid flow rates. The findings provide valuable experimental insight for validating numerical models and offer practical guidance for geometric optimization aimed at improving centrifugal pump performance under two-phase flow conditions. Full article
(This article belongs to the Special Issue Selected Papers from the Conference on Modelling Fluid Flow (CMFF’25))
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20 pages, 2743 KB  
Article
Improving Pressure Buildup and Water Purity in a PTJ Separation Pump
by Jessica Dafis, Xuemei Zhang, Katharina Zähringer and Dominique Thévenin
Int. J. Turbomach. Propuls. Power 2026, 11(2), 21; https://doi.org/10.3390/ijtpp11020021 - 14 May 2026
Viewed by 259
Abstract
A modified Pitot-tube jet (PTJ) separation pump combines centrifugal phase separation with pressure buildup and enables compact oil–water treatment, where a water-rich stream can be discharged at elevated pressure. This work advances an existing laboratory PTJ configuration toward a turbomachinery-oriented rotor concept for [...] Read more.
A modified Pitot-tube jet (PTJ) separation pump combines centrifugal phase separation with pressure buildup and enables compact oil–water treatment, where a water-rich stream can be discharged at elevated pressure. This work advances an existing laboratory PTJ configuration toward a turbomachinery-oriented rotor concept for systematic design studies and subsequent field-oriented prototypes. Starting from a centrifuge-like reference configuration without blades that prioritizes separation stability, an impeller with trimmed blades is introduced to increase pressure head while limiting blade interaction with the oil–water interface by operating primarily in the outer, water-rich annulus. Comparative experiments with and without the impeller show a pronounced increase in pressure head, up to about a factor of three at the maximum speed investigated. The results also indicate a purity penalty caused by blade-induced mixing and secondary flows. This exposes the central design trade-off of the PTJ machine. Higher specific work input increases pressure head but can reduce discharge quality. Hydraulic optimization, therefore, needs to be coupled to ppm-level purity constraints. Density-based monitoring lacks resolution in the relevant trace range, and chemical-based analyses are too slow for systematic investigations. An imaging-based fluorescence method using Nile Red as a selective tracer is, therefore, implemented as a rapid analysis tool. High-resolution imaging with automated region of interest evaluation provides a robust calibration from 5–500 ppm for safe, non-fluorescent model oils such as sunflower oil. This enables efficient operating-window mapping and comparative screening of rotor concepts under reproducible conditions. Full article
(This article belongs to the Special Issue Selected Papers from the Conference on Modelling Fluid Flow (CMFF’25))
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