Fast Transient Simulation of Vehicle Underhood in Heat Soak

Franchetta, M; Bancroft, T. G.; Suen, K.O.

doi:10.4271/2006-01-1606

Cited by 20 publications

(7 citation statements)

References 7 publications

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“…Several previous studies have concentrated on the investigation of buoyancy-driven flow in the engine bay using coupled 1D-3D simulations. Franchetta et al [6,7] considered a half-scale engine compartment to perform experimental and numerical investigation of natural convection during thermal soak. A number of works used a full-scale size model that makes possible to capture the transient flow structures [8,9].…”

Section: Intoductionmentioning

confidence: 99%

A Coupled 1D–3D Numerical Method for Buoyancy-Driven Heat Transfer in a Generic Engine Bay

et al. 2019

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Energy efficient vehicles are essential for a sustainable society and all car manufacturers are working on improved energy efficiency in their fleets. In this process, an optimization of aerodynamics and thermal management is most essential. The objective of this work is to improve the energy efficiency using encapsulated heat generating units by focusing on predicting temperature distribution inside an engine bay. The overall objective is to make an estimate of the generated heat inside an encapsulation and consecutively use this heat for climatization purposes. The study presents a detailed numerical procedure for predicting buoyancy-driven flow and resulting natural convection inside a simplified vehicle underhood during thermal soak and cool-down events. The procedure employs a direct coupling of one-dimensional and three-dimensional methods to carry out transient one-dimensional thermal analysis in the engine solids synchronized with sequences of steady-state three-dimensional simulations of the fluid flow. The boundary heat transfer coefficients and averaged fluid temperatures in the boundary cells, computed in the three-dimensional fluid flow model, are provided as input data to the one-dimensional analysis to compute the resulting surface temperatures which are then fed back as updated boundary conditions in the flow simulation. The computed temperatures of the simplified engine and the exhaust manifolds during the thermal soak and cool-down period are in favorable agreement with experimental measurements. The present study illustrates the capabilities of the coupled thermal-flow methodology to conduct accurate and fast computations of buoyancy-driven heat transfer. The methodology can be potentially applied to design and analysis of multiple demand vehicle thermal management systems in hybrid and electrical vehicles.

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Section: Intoductionmentioning

confidence: 99%

A Coupled 1D–3D Numerical Method for Buoyancy-Driven Heat Transfer in a Generic Engine Bay

et al. 2019

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“…Ecer [2] calculated the velocity over the radiator and air-to boil temperature by CFD using PASSAGE. Franchetta [3] investigated a computational procedure and implemented it in VECTIS that delivers accurate transient predictions with substantially reduced computational time. Lawrence [4] improved under hood air flow by CFD.…”

Section: Introductionmentioning

confidence: 99%

Integration of 1D and 3D Simulations of Engine Cooling System: After Keyed-Off

Pang

Masjuki

Hazrat

et al. 2011

2011 10th International Symposium on Distributed Computing and Applications to Business, Engineering and Science

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Engine cooling system is crucial to maintain working temperature of vehicles' engine. The two main heat transfer fluids in typical cooling system are coolant and air. Under hood air flow when approaching radiator is highly non-uniform, thus 3D computational fluid dynamics is required to estimate air mass flow rates. While coolant circuit consists of numerous components, 1D thermal-fluid simulation is utilized to study temperature behavior of the coolant. Automotive designers should design a robust engine cooling system which is working well in both normal and severe driving conditions. When vehicles are keyed-off suddenly after some distance of driving, the coolant temperature tend to increase dramatically. This is because soaking heat at engine could not be transferred away timely, as water pump and cooling fan have stop working after keyed-off. In this study, transient coolant temperatures are observed closely with variety patterns of soaking heat. It is suggested to prolong operation of water pump and fan for a short while after keyed-off to reduce transient coolant temperature.

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“…The Grashof numbers used in this study were around 3 and 4 at the nearby regions of the engine × 10 8 × 10 5 block and exhaust respectively. The transient simulation was carried out using ANSYS Fluent [5]. The transient simulation with time-steps from 0.01 s to 0.001 s was run for 60 seconds of physical time before reaching a steady state result.…”

Section: Introductionmentioning

confidence: 99%

“…Upon the studies on the simplified engine bay geometry [4][5][6][7], the transient simulation method for the buoyance-driven convection flow in the engine bay was developed further to apply in passenger vehicles for unsteady thermal management [8][9][10]. Numerical investigations [8] were carried out combining 3D computational fluid dynamics (CFD) simulation from STAR-CCM+ with 1D thermal modelling in GT-SUITE for the heat retention analysis in an engine bay with thermal encapsulation of a Volvo S80 passenger car.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of buoyancy-driven heat transfer within engine bay environment during thermal soak

Yuan

Sivasankaran

Dutta

et al. 2020

Applied Thermal Engineering

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Fast Transient Simulation of Vehicle Underhood in Heat Soak

Cited by 20 publications

References 7 publications

A Coupled 1D–3D Numerical Method for Buoyancy-Driven Heat Transfer in a Generic Engine Bay

A Coupled 1D–3D Numerical Method for Buoyancy-Driven Heat Transfer in a Generic Engine Bay

Integration of 1D and 3D Simulations of Engine Cooling System: After Keyed-Off

Numerical investigation of buoyancy-driven heat transfer within engine bay environment during thermal soak

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