Literature review on pressure–velocity decoupling algorithms applied to built-environment CFD simulation

Wang, Haidong; Wang, Hui; Gao, Feng; Zhou, Pengzhi; Zhai, Zhiqiang

doi:10.1016/j.buildenv.2018.07.046

Cited by 48 publications

(9 citation statements)

References 48 publications

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“…To realize the accurate simulation of the unsteady aerodynamic characteristics of the train with the aerodynamic braking plate, FLUENT software's pressurebased solver was used, and pressure-velocity coupling was resolved by the semi-implicit method for pressurelinked equations-consistent (SIMPLEC) (Jang et al, 1986;Latimer & Pollard, 1985;Van Doormaal & Raithby, 1984;Wang et al, 2018a). Convection terms and dissipation terms in equations were dispersed by the bounded central differencing and second-order upwind scheme.…”

Section: Methodsmentioning

confidence: 99%

Comparison of different configurations of aerodynamic braking plate on the flow around a high-speed train

Niu

Wang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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End of vehicle streamlined head was selected as the installation location, and aerodynamic behavior of trains with and without braking plates was compared to analyze the formation of the braking force and the evolution of the flow field. An IDDES method based on the SST κ-ω turbulence model was used to investigate the unsteady flow, and the numerical algorithm was validated. Results show that the train aerodynamic drag was significantly increased by opening the braking plates, especially when several braking plates were arranged separately in series on each train car. Furthermore, the effect of the plate installed on the tail car was superior to that of the braking plate on the head car, when only a single braking plate was used. It was also found that both the maximum value of the slipstream and negative pressure close to the braking plate depend on the position and size of the braking plate. The flow field around the lower part of the train was only slightly affected by opening the braking plates, and pairs of vortices over the train appeared when the braking plates were opened, significantly affected both size and position of vortices in the train wake.

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Section: Methodsmentioning

confidence: 99%

Comparison of different configurations of aerodynamic braking plate on the flow around a high-speed train

Niu

Wang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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“…In numerical simulations, the momentum and pressure were solved using a second-order upwind scheme and a second-order scheme, respectively. The pressure-velocity coupling was calculated using the SIMPLE algorithm [101]. The solution gradients were evaluated by direct interpolation using a least squares method at the center of each cell.…”

Section: Non-linear Fluid Flow Modelling In Fracture Intersectionsmentioning

confidence: 99%

Modelling of Coupled Hydro-Thermo-Chemical Fluid Flow through Rock Fracture Networks and Its Applications

Dong

Wang

et al. 2021

Geosciences

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Most rock masses contain natural fractures. In many engineering applications, a detailed understanding of the characteristics of fluid flow through a fractured rock mass is critically important for design, performance analysis, and uncertainty/risk assessment. In this context, rock fractures and fracture networks play a decisive role in conducting fluid through the rock mass as the permeability of fractures is in general orders of magnitudes greater than that of intact rock matrices, particularly in hard rock settings. This paper reviews the modelling methods developed over the past four decades for the generation of representative fracture networks in rock masses. It then reviews some of the authors’ recent developments in numerical modelling and experimental studies of linear and non-linear fluid flow through fractures and fracture networks, including challenging issues such as fracture wall roughness, aperture variations, flow tortuosity, fracture intersection geometry, fracture connectivity, and inertia effects at high Reynolds numbers. Finally, it provides a brief review of two applications of methods developed by the authors: the Habanero coupled hydro-thermal heat extraction model for fractured reservoirs and the Kapunda in-situ recovery of copper minerals from fractures, which is based on a coupled hydro-chemical model.

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“…Unlike a coupled solution, a single approach solves the velocity and pressure fields independently or sequentially. It has the benefit of reducing computer memory and processing time, making it more effective for studying incompressible environment simulation fluids, as in our case for aortic stenosis modeling [36]. The pressure analysis of the proposed model is shown in Figure 16.…”

Section: Setting Of the Solutionmentioning

confidence: 99%

Medical Decision Making for Cardiac MRI with CFD “Detection of Severe Stenosis Using a 5D Model of the Descending Aorta”

Sakly

Saïd²,

Tagina

2021

BioMedInformatics

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The aim of this study is to develop a reliable 5D (x, y, z, time, flow dimension) model for medical decision making. Sophisticated techniques for the assessment of serious stenosis were developed using time-dependent instantaneous pressure gradients through the aorta (flow rate, Reynolds number, velocity, etc.). A 74 cardiac MRI scan and 3057 scans were performed on a 10-year-old patient with congenital valve and valvular aortic stenosis on sensitive MRI and coarctation (operated and then dilated) in the sense of shone syndrome. The occlusion rate was estimated to be 80.5%. The stenosis area was approximately 15 mm long and 10 mm high. The fluid solver (NS) exhibited a significant shear stress of −3.735 × 10−5 Pa within the first 10 iterations. There was a significant drop in the flux mass of −0.0050 (kg/s), as well as high blood turbulence in vortex field lines and low geometry Reynolds cells. The fifth dimension was used for negative velocity prediction (−81.4 cm/s). The discoveries of the 5D aortic simulation are convincing based on the evaluation of its physical and biomedical features.

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Literature review on pressure–velocity decoupling algorithms applied to built-environment CFD simulation

Cited by 48 publications

References 48 publications

Comparison of different configurations of aerodynamic braking plate on the flow around a high-speed train

Comparison of different configurations of aerodynamic braking plate on the flow around a high-speed train

Modelling of Coupled Hydro-Thermo-Chemical Fluid Flow through Rock Fracture Networks and Its Applications

Medical Decision Making for Cardiac MRI with CFD “Detection of Severe Stenosis Using a 5D Model of the Descending Aorta”

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