Charge Motion and Mixture Formation Analysis of a DISI Engine Based on an Adaptive Parallel Mesh Approach

Stapf, Karl Georg; Menon, Sandeep; Schmidt, David P.; Rieß, Michael; Sens, Marc

doi:10.4271/2014-01-1136

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The ultimate measure of mesh quality is that the mesh supports highquality CFD results. The calculations were performed on a slightly different engine [53] where experimental data were available. The computationally predicted pressure was compared to experimental measurements, as shown in Figure 21.…”

Section: Internal Combustion Enginementioning

confidence: 99%

Parallel adaptive simplical re-meshing for deforming domain CFD computations

Menon

Mooney

Stapf³

et al. 2015

Journal of Computational Physics

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Deforming domains occur in many fields of computational fluid dynamics (CFD), such as interface tracking, simulation of pumps and engines, and fluid/structure interaction. The deformation of the domain presents a challenge to the integrity of the computational mesh; substantial motion of the domain boundaries requires vertex motion and changes in mesh connectivity. For cases of simple boundary motion or structured meshes, predetermined changes to the mesh structure can be sufficient. However, without a priori knowledge of how the domain will change, a more robust solution is required. The present work offers a parallelized solution for simplical meshes that is well-suited to extremely complex geometry. The mesh continuously evolves without user intervention or the use of target meshes. Varying length scales imposed by evolving boundary curvatures and narrow gaps are resolved with a fast length-scale algorithm. The set of algorithms are incorporated into an object-oriented code structure that permits broad application to a range of CFD problems. The robustness and versatility of the algorithm is demonstrated in several examples, representing motion of internal and external boundaries, where the boundary motion may or may not be known a priori.

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Section: Internal Combustion Enginementioning

confidence: 99%

Parallel adaptive simplical re-meshing for deforming domain CFD computations

Menon

Mooney

Stapf³

et al. 2015

Journal of Computational Physics

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“…There is a wide range of examples about mesh handling of IC engine geometries [8,9,10,11,12,13,14] in the existing literature and also from the same authors' research group [15]. Most of these strategies use multiple grids, that are sometimes generated before the fluid dynamics is solved or automatically during the calculation.…”

Section: Introductionmentioning

confidence: 99%

An Extension of the Dynamic Mesh Handling with Topological Changes for LES of ICE in OpenFOAM^®

Montorfano¹,

Piscaglia²,

Onorati³

2015

SAE Technical Paper Series

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The paper focuses on the development of a mesh moving method based on non-conformal topologically changing grids applied to the simulation of IC engines, where the prescribed motion of piston and valves is accomplished by rigidly translating the sub-domain representing the moving component. With respect to authors previous work, a more robust and efficient algorithm to handle the connectivity of non-conformal interfaces and a mesh-motion solver supporting multiple layer addition/removal of cells, to decouple the time-step constraints of the mesh motion and of the fluid dynamics, has been implemented as a C++ library to extend the already existing classes for dynamic mesh handling of the finite-volume, open-source CFD code OpenFOAM ® . Other new features include automatic decomposition of large multiple region domains to preserve processors load balance with topological changes for parallel computations and additional tools for automatic preprocessing and case setup. Finally, a transient solver for compressible viscous flows based on the transient SIMPLE algorithm has been implemented in order to enhance conservation of mass and energy for domains sliding over dynamically attached/detached boundaries. The advantages are significant: mesh changes in terms of topology and deformation are fully managed by the mesh motion solver without remeshing, with a consequent reduction of the overall simulation time. Most important, the method allows to preserve the quality of the mesh initially defined by the user (skewness, non-orthogonality and aspect ratio) during the whole engine cycle, favoring a faster convergence of the solver and a very accurate fluid-dynamic solution. Used in conjunction with LES turbulence modeling, the method allows to decouple mesh motion by LES filter operation, since the filter width is kept constant during the entire cycle. Validation tests have been performed on the full-cycle simulation of a Transparent Combustion Chamber (TCC) engine, whose experimental data are available through the Engine Combustion Network database (ECN). The implementation of the described methodology is absolutely general, it works on any number of processors and it can be applied to any application where moving parts and non-conformal interfaces are involved.

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Development of a Web-Based Open Source CAE Platform for Simulation of IC Engines

Lee

Kim

Park

et al. 2020

Int.J Automot. Technol.

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Charge Motion and Mixture Formation Analysis of a DISI Engine Based on an Adaptive Parallel Mesh Approach

Cited by 5 publications

References 11 publications

Parallel adaptive simplical re-meshing for deforming domain CFD computations

Parallel adaptive simplical re-meshing for deforming domain CFD computations

An Extension of the Dynamic Mesh Handling with Topological Changes for LES of ICE in OpenFOAM^®

Development of a Web-Based Open Source CAE Platform for Simulation of IC Engines

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Charge Motion and Mixture Formation Analysis of a DISI Engine Based on an Adaptive Parallel Mesh Approach

Cited by 5 publications

References 11 publications

Parallel adaptive simplical re-meshing for deforming domain CFD computations

Parallel adaptive simplical re-meshing for deforming domain CFD computations

An Extension of the Dynamic Mesh Handling with Topological Changes for LES of ICE in OpenFOAM®

Development of a Web-Based Open Source CAE Platform for Simulation of IC Engines

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Product

Resources

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An Extension of the Dynamic Mesh Handling with Topological Changes for LES of ICE in OpenFOAM^®