Computational Fluid Dynamics Simulation of a Three-Dimensional Catalytic Layer for Decane Oxidation: Case Study of Reaction on Particle Surface

2011 ◽  
Vol 50 (21) ◽  
pp. 11879-11888 ◽  
Author(s):  
Alessio Caravella ◽  
Shigeki Hara ◽  
Nobuo Hara ◽  
Akira Obuchi ◽  
Junko Uchisawa
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Particle Surface ◽  
Three Dimensional ◽  
Dynamics Simulation ◽  
Catalytic Layer ◽  
Computational Fluid Dynamics Simulation

Three-dimensional turbulence modeling and computational fluid dynamics simulation of hydrodynamics of two-impinging-jet spinning disk reactors

2018 ◽  
Vol 30 (12) ◽  
pp. 125105 ◽  
Author(s):  
Mohamadali Mirzaei ◽  
Asghar Molaei Dehkordi ◽  
Seyyed Mohammad Hossein Hashemi Amrei
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Turbulence Modeling ◽  
Three Dimensional ◽  
Impinging Jet ◽  
Dynamics Simulation ◽  
Computational Fluid Dynamics Simulation ◽  
Spinning Disk

Experimental and simulation study of thermal accumulation in an enclosed vehicle

2019 ◽  
Vol 233 (14) ◽  
pp. 3621-3629
Author(s):  
Sing Ngie David Chua ◽  
Boon Kean Chan ◽  
Soh Fong Lim
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Dynamics Simulation ◽  
Computational Fluid Dynamics Simulation ◽  
Heat Accumulation ◽  
Ansys Fluent ◽  
Direct Exposure ◽  
Car Park

Thermal accumulation in a car cabin under direct exposure to sunlight can be extremely critical due to the risk of heatstroke especially to children who are left unattended in the car. There are very limited studies in the literature to understand the thermal behaviour of a car that is parked in an open car park space and the findings are mostly inconsistent among researchers. In this paper, the studies of thermal accumulation in an enclosed vehicle by experimental and computational fluid dynamics simulation approaches were carried out. An effective and economical method to reduce the heat accumulation was proposed. Different test conditions such as fully enclosed, fully enclosed with sunshade on front windshield and different combinations of window gap sizes were experimented and presented. Eight points of measurement were recorded at different locations in the car cabin and the results were used as the boundary conditions for the three-dimensional computational fluid dynamics simulation. The computational fluid dynamics software used was ANSYS FLUENT 16.0. The results showed that the application of sunshade helped to reduce thermal accumulation at car cabin by 11.5%. The optimum combination of windows gap size was found to be with 4-cm gap on all four windows which contributed to a 21.1% reduction in car cabin temperature. The results obtained from the simulations were comparable and in agreement with the experimental tests.

Three-dimensional computational fluid dynamics simulation of valve-induced water hammer

2016 ◽  
Vol 231 (12) ◽  
pp. 2263-2274 ◽  
Author(s):  
Shuai Yang ◽  
Dazhuan Wu ◽  
Zhounian Lai ◽  
Tao Du
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Method Of Characteristics ◽  
Three Dimensional ◽  
Water Hammer ◽  
Dynamics Simulation ◽  
Computational Fluid Dynamics Simulation ◽  
Time Step ◽  
Obvious Effect ◽  
Simulation Results

In this study, three-dimensional computational fluid dynamics simulation was adopted to evaluate the valve-induced water hammer phenomena in a typical tank-pipeline-valve-tank system. Meanwhile, one-dimensional analysis based on method of characteristics was also used for comparison and reference. As for the computational fluid dynamics model, the water hammer event was successfully simulated by using the sliding mesh technology and considering water compressibility. The key factors affecting simulation results were investigated in detail. It is found that the size of time step has an obvious effect on the attenuation of the wave and there exists a best time step. The obtained simulation results have a good agreement with the experimental data, which shows an unquestionable advantage over the method of characteristics calculation in predicting valve-induced water hammer. In addition, the computational fluid dynamics simulation can also provide a visualization of the pressure and flow evolutions during the transient process.

scholarly journals A computational fluid dynamics simulation of liquid swallowing by impaired pharyngeal motion: bolus pathway and pharyngeal residue

2019 ◽  
Vol 317 (6) ◽  
pp. G784-G792 ◽  
Author(s):  
Jun Ohta ◽  
Shunichi Ishida ◽  
Tetsuaki Kawase ◽  
Yukio Katori ◽  
Yohsuke Imai
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Three Dimensional ◽  
Dynamics Simulation ◽  
Residual Volume ◽  
Computational Fluid Dynamics Simulation ◽  
Pharyngeal Residue ◽  
Computational Modeling And Simulation ◽  
Liquid Bolus ◽  
Thickening Agents

Common practices to improve the ability to swallow include modifying physical properties of foods and changing the posture of patients. Here, we quantified the effects of the viscosity of a liquid bolus and patient posture on the bolus pathway and pharyngeal residue using a computational fluid dynamics simulation. We developed a computational model of an impaired pharyngeal motion with a low pharyngeal pressure and no pharyngeal adaptation. We varied viscosities from 0.002 to 1 Pa·s and postures from −15° to 30° (from nearly vertical to forward leaning). In the absence of pharyngeal adaptation, a honey-like liquid bolus caused pharyngeal residue, particularly in the case of forward-leaning postures. Although the bolus speed was different among viscosities, the final pathway was only slightly different. The shape, location, and tilting of the epiglottis effectively invited a bolus to two lateral pathways, suggesting a high robustness of the swallowing process. NEW & NOTEWORTHY Thickening agents are often used for patients with dysphagia. An increase in bolus viscosity not only reduces the risk of aspiration but also can cause a residual volume in the pharynx. Because information obtained from videofluoroscopic swallowing studies is only two-dimensional, measurement of pharyngeal residue is experimentally difficult. We successfully quantified the three-dimensional bolus pathway and the pharyngeal residual volume using computational modeling and simulation.

Wind suitability in site analysis of coastal concave terrains using computational fluid dynamics simulation: a case study in East Asia

2017 ◽  
Vol 18 (9) ◽  
pp. 741-756
Author(s):  
Xiao-qing Zhu ◽  
Jian-tao Weng ◽  
Yi-qun Wu ◽  
Wei-jun Gao ◽  
Zhu Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
East Asia ◽  
Dynamics Simulation ◽  
Computational Fluid Dynamics Simulation ◽  
Site Analysis
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