Accuracy Variations in Residual Distribution and Finite Volume Methods on Triangular Grids

Chizari, Hossain; Ismail, Farzad

doi:10.1007/s40840-015-0292-0

Cited by 18 publications

(3 citation statements)

References 10 publications

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“…The computational mesh of Ahmed body simulation is shown in Figure 8. Mesh metrics for 3D non-uniform grid are checked to ensure that the mesh is qualified based on the mesh quality recommended by [22] and [23] as shown in Table 1. Yplus requirement is shown in Table 2.…”

Section: Grid Independence Test (Git)mentioning

confidence: 99%

Drag Reduction on a Three Dimensional Teardrop-Shaped Body Car with Different Stagnation Points

Lee

Tiew²,

Chang³

et al. 2022

Int. J. Automot. Mech. Eng.

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The long-term goal in the automotive industry is to reduce fuel consumption and environmental pollution without compromising the aerodynamic performance of the car. Herein, the aerodynamic performance of an in-house designed Shell Eco-Marathon prototype car is analyzed using Computational Fluid Dynamics simulations. Shape optimization of the Shell car is executed to reduce drag by modifying the rear underbody profile and stagnation point position. The effect of one modification to another is studied to determine the changes to overall flow around the car and, more importantly, the lift and drag coefficients. It has been found that the stagnation point height has a higher influence on the aerodynamic performance of the car compared to variations of the rear underbody, with optimum drag reductions of 17% and 10%, respectively. Moreover, combining the two best configurations to the car reduces CD by 25%, and this marks the highest drag reduction achieved in this study.

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Section: Grid Independence Test (Git)mentioning

confidence: 99%

Drag Reduction on a Three Dimensional Teardrop-Shaped Body Car with Different Stagnation Points

Lee

Tiew²,

Chang³

et al. 2022

Int. J. Automot. Mech. Eng.

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“…Finite volume methods are very sensitive to grid quality [30]. The generated mesh has a good quality with a maximum skewness of 0.88619, an average skewness around 0.14053 and an average aspect ratio of 2.0015 of which is within the recommended range [31,32]. Figure 7 presents the Fluent unstructured mesh that was used in this study.…”

Section: Fixed Supportmentioning

confidence: 99%

Fluid-Structure Interaction on The Design of Fully Assembled Shell Eco-Marathon (SEM) Prototype Car

Tiew

Lee

Chang

et al. 2020

CFDL

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To achieve high fuel efficiency, vehicles designs are inclined to choose lightweight materials and structures. However, these structures are generally weak, and structural integrity is a common concern. The purpose of this paper is to carry out fluid-structure interaction (FSI) study in one-way coupling analysis on a Shell Eco Marathon (SEM) prototype car which travels in a low-speed range to analyse its structural response. A new set of economical materials is proposed and analysed with the concern on self-fabrication process. The Flax fibre composite is introduced as a part of the proposed material set due to its environmental and economic advantages. The study herein is purely a numerical simulation work as a first approach to design a sustainable SEM prototype car. The fully assembled SEM prototype car was analysed with the proposed materials with ANSYS Workbench in the coupling of the fluid (ANSYS Fluent) and structural solver (ANSYS Mechanical) in a one-way FSI. Even with a thin shell design, the proposed material only experiences minimum deformations. The simulations also reveal that the maximum von-Mises stress experienced, after considered the safety factor, is still several order lower than the yield strength. This study has confirmed that the car design has fulfilled its structural requirements to operate at the design speed.

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“…Discretization on RD method is based on cell vertex solutions and cell residuals. RD methods are known to be less sensitive to grid variations and have been proven by Chizari, Ismail and Abgrall [7][8][9] for advection problems. RD methods are also more compact which allows a more efficient parallel computation [10] and have a natural platform to incorporate multidimensional fluid physics stated by Deconinck et al, [11].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Grid Skewness on Non-Unified Compact Residual Distribution Methods for Scalar Advection Diffusion Problems

Aminnuddin¹,

Ismail²,

Mohamed³

et al. 2020

CFDL

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In this paper, the newly developed residual distribution (RD) method called the Flux-Difference approach is combined with the Galerkin method to solve the advectiondiffusion equation in separate (non-unified) manner. It is due to the incapability of variation grid skewness in finite volume. This Flux-Difference RD method maintains a compact stencil and the whole process of solving advection-diffusion do not require additional equations. In order to improve the order of accuracy losses by the classic RD schemes, the present scheme will be tested using non-unified manners. The numerical results show that the Flux-Difference RD method preserves second-order accuracy up to about skewness 0.4 but drops to about 1.5 orders accurate when grid skewness is 0.6.

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Accuracy Variations in Residual Distribution and Finite Volume Methods on Triangular Grids

Cited by 18 publications

References 10 publications

Drag Reduction on a Three Dimensional Teardrop-Shaped Body Car with Different Stagnation Points

Drag Reduction on a Three Dimensional Teardrop-Shaped Body Car with Different Stagnation Points

Fluid-Structure Interaction on The Design of Fully Assembled Shell Eco-Marathon (SEM) Prototype Car

The Effect of Grid Skewness on Non-Unified Compact Residual Distribution Methods for Scalar Advection Diffusion Problems

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