Effects of the Domain Zonal Decomposition on the Hybrid URANS/LES Modeling of the TCC-III Motored Engine Flow

Krastev, Vesselin Krassimirov; D'Adamo, Alessandro; Rulli, Federico; Fontanesi, Stefano

doi:10.4271/2019-24-0097

Cited by 8 publications

(17 citation statements)

References 43 publications

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“…MI k (11) with N being the total number of sampling points over the FOV. Expressions (11) can be enhanced with the addition of Kinetic Energy (KE)-based weights in the averaging operator [26]:…”

Section: Resultsmentioning

confidence: 99%

“…The bore × stroke values are equal to 92 × 86mm, with a (nominal) compression ratio of 10:1. This engine has already been the object of extensive numerical studies by the authors [26,27,35,36], in which the zonal hybrid methodology shown above has been implemented into the STAR-CD software [37] and then assessed and validated on a relatively fine computational grid (2×10 6 elements at the BDC). Nonetheless, a head-to-head comparison between the DES and DESx modes of operation was still missing and is, therefore, proposed here.…”

Section: Zonal-des Implementationmentioning

confidence: 99%

“…The full engine geometry has been included in the model, with the in-cylinder zone (colored in red in Figure 1a) treated as DES or DESx and all the remaining volumes treated as URANS. Further details on the numerical method and setup can be found in [26,27] and are omitted here for the sake of brevity.…”

Section: Zonal-des Implementationmentioning

confidence: 99%

“…The main reason for considering hybrid approaches for engine modeling is the increasingly compelling need for high-quality time and space resolved numerical data sets, but at a reduced computational cost compared to standard LES, as outlined in [8][9][10][11]. Most of the studies currently reported in the scientific literature are based on the Detached-Eddy Simulation (DES) concept and its derivatives [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], while a few of them relies on the Scale-Adaptive Simulation (SAS) approach [15,16,28,29].…”

Section: Introductionmentioning

confidence: 99%

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Standard and consistent Detached-Eddy Simulation for turbulent engine flow modeling: an application to the TCC-III engine

et al. 2020

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Multidimensional modeling of Cycle-to-Cycle Variability (CCV) has become a crucial support for the development and optimization of modern direct-injection turbocharged engines. In that sense, the only viable modeling options is represented by scale-resolving approaches such as Large Eddy Simulation (LES) or hybrid URANS/LES methods. Among other hybrid approaches, Detached-Eddy Simulation (DES) has the longest development story and is therefore commonly regarded as the most reliable choice for engineering-grade simulation. As such, in the last decade DESbased methods have found their way through the engine modeling community, showing a good potential in describing turbulence-related CCV in realistic engine configurations and at reasonable computational costs. In the present work we investigate the in-cylinder modeling capabilites of a standard two-equation DES formulation, compared to a more recent one which we call DESx. The DESx form differs from standard DES in the turbulent viscosity switch from URANS to LES-like behavior, which for DESx is fully consistent with Yoshizawa’s one-equation sub-grid scale model. The two formulations are part of a more general Zonal-DES (ZDES) methodology, developed and validated by the authors in a series of previous publications. Both variants are applied to the multi-cycle simulation of the TCC-III experimental engine setup, using sub-optimal grid refinement levels in order to stress the model limitations in URANS-like numerical resolution scenarios. Outcomes from this study show that, although both alternatives are able to ouperform URANS even in coarse grid arrangements, DESx emerges as sligthly superior and thus it can be recommended as the default option for in-cylinder flow simulation.

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Section: Resultsmentioning

confidence: 99%

Section: Zonal-des Implementationmentioning

confidence: 99%

Section: Zonal-des Implementationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Standard and consistent Detached-Eddy Simulation for turbulent engine flow modeling: an application to the TCC-III engine

et al. 2020

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“…(2) Plane-averaging is conditioned on the experimentally limited FOV, discarding out-ofview areas (marked with Not a Number (NaN) value in all the figures shown here); furthermore, it attributes an equal relevance to all areas. In order to avoid misleading observations an original variation to such indices was proposed in [40]. A weighted averaging (wa) operation is introduced, based on the sum of the 2D PIV and numerically predicted kinetic energies (KE) for the k−th point of the FOV (Eq.…”

Section: Alignment Parametermentioning

confidence: 99%

Impact of Grid Density on the Analysis of the In-Cylinder Flow of an Optical Engine

2020

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The evaluation of Internal Combustion Engine (ICE) flows by 3D-CFD strongly depends on a combination of mutually interacting factors, among which grid resolution, closure model, numerics. A careful choice should be made in order to limit the extremely high computational cost and numerical problems arising from the combination of refined grids, high-order numeric schemes and complex geometries typical of ICEs. The paper focuses on the comparison between different grid strategies: in particular, attention is focused firstly on near-wall grid through the comparison between multi-layer and single-layer grids, and secondly on core grid density. The performance of each grid strategy is assessed in terms of accuracy and computational efficiency. A detailed comparison is presented against PIV flow measurements of the Spray Guided Darmstadt Engine available at the Darmstadt University of Technology. As many research groups are simultaneously working on the Darmstadt engine using different CFD codes and meshing approaches, it constitutes a perfect environment for both method validation and scientific cooperation. A motored engine condition is chosen and the flow evolution throughout the engine cycle is evaluated on two different section planes. Pros and cons of each grid strategy are highlighted and motivated.

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Cold-Flow Investigation of the Darmstadt Engine with Focus on Statistical Convergence: Experimental and Large Eddy Simulation Analysis

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Iacovano

Fontanesi

2022

Flow Turbulence Combust

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Effects of the Domain Zonal Decomposition on the Hybrid URANS/LES Modeling of the TCC-III Motored Engine Flow

Cited by 8 publications

References 43 publications

Standard and consistent Detached-Eddy Simulation for turbulent engine flow modeling: an application to the TCC-III engine

Standard and consistent Detached-Eddy Simulation for turbulent engine flow modeling: an application to the TCC-III engine

Impact of Grid Density on the Analysis of the In-Cylinder Flow of an Optical Engine

Cold-Flow Investigation of the Darmstadt Engine with Focus on Statistical Convergence: Experimental and Large Eddy Simulation Analysis

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