Faculté des Sciences appliquées
Faculté des Sciences appliquées

Development and validation of a re-meshing procedure for the flow simulation inside a natural gas piston engine

Maesen, Arthur ULiège
Promotor(s) : Terrapon, Vincent ULiège
Date of defense : 25-Jun-2020/26-Jun-2020 • Permalink :
Title : Development and validation of a re-meshing procedure for the flow simulation inside a natural gas piston engine
Translated title : [fr] Développement et validation d'une procédure de re-maillage pour la simulation de l'écoulement dans un moteur à piston au gaz naturel
Author : Maesen, Arthur ULiège
Date of defense  : 25-Jun-2020/26-Jun-2020
Advisor(s) : Terrapon, Vincent ULiège
Committee's member(s) : Hillewaert, Koen ULiège
Fitschy, Laurent 
Language : English
Number of pages : 94
Keywords : [en] CFD
[en] Re-meshing
[en] Mesh motion
[en] Piston engine
[en] Compressed natural gas
Discipline(s) : Engineering, computing & technology > Aerospace & aeronautics engineering
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil en aérospatiale, à finalité spécialisée en "aerospace engineering"
Faculty: Master thesis of the Faculté des Sciences appliquées


[en] Thermal engines are the most widely used prime-movers in the automobile industry. Among them the most encountered ones are the gasoline and diesel internal combustion engines. However because of the global warming concerns, natural gas engines emerge as a good alternative. The development and understanding of such engines are thus essential.

This master thesis has been proposed by GDTech which takes part in the COSMOZ R&D project associated to the optimisation of compressed natural gas engines. The CFD simulation of the flow inside a PSA four-stroke natural gas engine is investigated using the environment OpenFoam. A full engine cycle, composed of the intake, compression, expansion and exhaust phases is simulated.

Because of the piston and valves movements, the mesh is deforming during the engine cycle. A re-meshing must be done as soon as the mesh cells deform too much. As no built-in re-meshing capability exists in OpenFoam, it must be implemented in parallel. The first goal of this work is thus to develop a re-meshing procedure suitable for piston engines using Python scripts beside the OpenFoam environment.

The second objective is to apply the procedure to the PSA engine so that the whole engine cycle can be simulated. To simplify the problem, and as they do not challenge the re-meshing procedure itself, the natural gas injection and the combustion process are not taken into account. The procedure is then validated using experimental measurements.
The mean pressure in the cylinder measured during the complete engine cycle is compared to the one computed in the cold simulation.



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  • Maesen, Arthur ULiège Université de Liège > Master ingé. civ. aérospat., à fin.


Committee's member(s)

  • Hillewaert, Koen ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Design of Turbomachines
    ORBi View his publications on ORBi
  • Fitschy, Laurent GDTech
  • Total number of views 148
  • Total number of downloads 438

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