Coupled CFD–FE analysis for the exhaust manifold to reduce stress of a direct injection-diesel engine

Sahoo, Dillip Kumar; Thiya, Raja

doi:10.1080/01430750.2017.1399457

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…It is crucial to accurately specify the boundary conditions of the exhaust manifold. The fluid's inlet characteristics, such as velocity and pressure, must be indicated [30][31][32]. Fluid and solid domains are delimited using wall boundary conditions as described in Table 3.…”

Section: Boundary Conditionmentioning

confidence: 99%

Analyzing the Impact of Cracks on Exhaust Manifold Performance: A Computational Fluid Dynamics Study

Nouhaila,

Hassane

2024

IJHT

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The exhaust manifold system plays a vital role in the internal combustion engine of a vehicle, functioning in conditions of high temperature and pressure. The objective of this analysis is to assess how the presence of the crack influences the pressure drop across the exhaust manifold. Understanding pressure drop is essential in determining the efficiency of the exhaust system and its effect on engine performance. Furthermore, we investigate how a crack in the exhaust manifold affects the flow patterns of exhaust gases, including changes in velocity, pressure distribution, and turbulence within the manifold; The results of the analysis show that the crack has various implications for both the performance and structural integrity of the manifold. It causes an increase in pressure drop across the manifold, resulting in reduced engine efficiency. Additionally, the crack induces turbulence or vortex formation in the exhaust gases, further impacting the system's performance, and finally, the impact of the presence of a crack typically results in an elevated coefficient of friction.

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Section: Boundary Conditionmentioning

confidence: 99%

Analyzing the Impact of Cracks on Exhaust Manifold Performance: A Computational Fluid Dynamics Study

Nouhaila,

Hassane

2024

IJHT

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“…The three basic principles governing fluid motion are mass, momentum, and energy conservation (Sahoo and Tahiya [20], Teja et al [21], and Benek and Ozsoyal [22]).…”

Section: Mathematical Modeling Governing Equationsmentioning

confidence: 99%

On the Accuracy of Turbulence Model Simulations of the Exhaust Manifold

Nouhaila,

Hassane,

Scutaru

et al. 2024

Applied Sciences

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This study investigating the accuracy of turbulence model simulations of the exhaust manifold using computational fluid dynamics (CFD) carries significant implications. By modeling and analyzing the flow of emissions, we aim to identify areas of high stress and pressure, minimize the pressure drop, and maximize the flow of exhaust gases. This not only enhances engine performance, reduces emissions, and improves the durability of the manifold but also provides a unique opportunity to predict and analyze the flow and performance of the exhaust manifold, both quantitatively and qualitatively. This paper aims to provide a detailed comparison of five turbulence models that are commonly used in CFD to offer valuable insights into their accuracy and reliability in predicting the flow characteristics of exhaust gases. The results show that the k-kl-ω model showed the highest maximum velocity and the most comprehensive temperature range, efficiently capturing the transitional flow effects. The K-ω STD and SST transition models displayed significantly higher turbulent kinetic energy (TKE) values, indicating their enhanced effectiveness in modeling complex turbulent and transitional flows. Conversely, the Reynolds stress and RNG k-epsilon models displayed lower TKE values, suggesting more subdued turbulence predictions. Despite this, all models exhibited similar pressure drop trends, with a noticeable increase near the midpoint of the manifold. These quantitative findings provide valuable insights into the suitability of different turbulence models for optimizing exhaust manifold design.

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“…Sahoo D.K. and Thiya R. [11] studied the effect of heat transfer intensity on thermal stresses in the details of the exhaust system. It should be noted that in most cases mathematical modelling of gas dynamics and heat exchange of gas flows is performed in stationary conditions.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer intensity of pulsating gas flows in the exhaust system elements of a piston engine

2019

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Internal combustion engines are the most common sources of energy among heat engines. Therefore, the improvement of their design and workflow is an urgent task in the development of world energy. Thermal-mechanical perfection of the exhaust system has a significant impact on the technical and economic performance of piston engines. The article presents the results of experimental studies of gasdynamics and heat exchange of pulsating gas flows in the exhaust system of a piston engine. Studies were carried out on a full-scale model of a single-cylinder engine. The article describes the instrument-measuring base and methods of experiments. The heat transfer intensity was estimated in different elements of the exhaust system: the exhaust pipe, the channel in the cylinder head, the valve assembly. Heat transfer studies were carried out taking into account the gas-dynamic nonstationarity characteristic of gas exchange processes in engines. The article presents data on the influence of gas-dynamic and regime factors on the heat transfer intensity. It is shown that the restructuring of the gas flow structure in the exhaust system occurs depending on the engine crankshaft speed, this has a significant impact on the local heat transfer coefficient. It has been established that the heat transfer intensity in the valve assembly is 2-3 times lower than in other elements of the exhaust system.

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Coupled CFD–FE analysis for the exhaust manifold to reduce stress of a direct injection-diesel engine

Cited by 6 publications

References 4 publications

Analyzing the Impact of Cracks on Exhaust Manifold Performance: A Computational Fluid Dynamics Study

Analyzing the Impact of Cracks on Exhaust Manifold Performance: A Computational Fluid Dynamics Study

On the Accuracy of Turbulence Model Simulations of the Exhaust Manifold

Heat transfer intensity of pulsating gas flows in the exhaust system elements of a piston engine

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