CFD simulation for the optimal design and utilization of experiment to research the flow process in PWR

2016 ◽  
Vol 94 ◽  
pp. 1-9 ◽  
Author(s):  
Guangliang Chen ◽  
Zhijian Zhang ◽  
Zhaofei Tian ◽  
Xiaomeng Dong ◽  
Yafeng Wang
Keyword(s):  
Optimal Design ◽  
Cfd Simulation ◽  
Flow Process

scholarly journals The study of the numerical diffusion in computational calculation

2020 ◽  
Vol 310 ◽  
pp. 00039
Author(s):  
Kamila Kotrasova ◽  
Vladimira Michalcova
Keyword(s):  
Heat Transfer ◽  
Differential Equation ◽  
Numerical Simulation ◽  
Continuity Equation ◽  
Cfd Simulation ◽  
Flow Process ◽  
Ansys Fluent ◽  
Numerical Diffusion ◽  
Mesh Density ◽  
Computational Calculation

The numerical simulation of flow process and heat transfer phenomena demands the solution of continuous differential equation and energy-conservation equations coupled with the continuity equation. The choosing of computation parameters in numerical simulation of computation domain have influence on accuracy of obtained results. The choose parameters, as mesh density, mesh type and computation procedures, for the numerical diffusion of computation domain were analysed and compared. The CFD simulation in ANSYS – Fluent was used for numerical simulation of 3D stational temperature flow of the computation domain.

CFD Simulation of Two-Phase Flow in a Downhole Venturi Meter

2011 ◽  
Vol 130-134 ◽  
pp. 3644-3647
Author(s):  
Ding Feng ◽  
Si Huang ◽  
Yu Hui Guan ◽  
Wei Guo Ma
Keyword(s):  
Optimal Design ◽  
Pressure Drop ◽  
Flow Field ◽  
Cfd Simulation ◽  
Two Phase Flow ◽  
Flow Simulation ◽  
Phase Flow ◽  
Feed Flow Rate ◽  
Two Phase ◽  
Oil Water

This work performs an oil-water two-phase flow simulation in a downhole Venturi meter to investigate the flow field and pressure characteristics with different flow and oil-water ratios. The relation between the pressure drop and the feed flow rate in the flowmeter is investigated for its optimal design.

http://dl4.globalstf.org/?wpsc-product=research-on-football-stadium-optimal-design-based-on-cfd-simulation-of-field-wind-environment

2017 ◽  
Author(s):  
Ezequiel Uson Guardiola ◽  
◽  
Nuria Ferrer Prat ◽  
Elisabet Uson Maimo ◽  
◽  
...  
Keyword(s):  
Optimal Design ◽  
Cfd Simulation ◽  
Wind Environment ◽  
Football Stadium

Optimal Design of Heating and Ventilation for Drying Room Based on Transient CFD Simulation

2013 ◽  
Vol 364 ◽  
pp. 524-528 ◽  
Author(s):  
Si Huang ◽  
Tian Tian Ding ◽  
Chao Yan ◽  
Zi Sheng Wang
Keyword(s):  
Heat Transfer ◽  
Optimal Design ◽  
Temperature Rise ◽  
Cfd Simulation ◽  
Numerical Solutions ◽  
Air Flow ◽  
Heating Time ◽  
Flow Speed ◽  
Drying Time ◽  
Flow And Heat Transfer

Transient air flow and heat transfer in a container-drying room is simulated by using Airpak software in this paper. The transient numerical solutions are obtained for air flow within the drying room including flow speed, pressure, temperature, mean age of air, etc. The analysis focuses on temperature, temperature rise and mean age of air surrounding the container surface with heating time. Drying design is determined by comparing two different ways for heating and ventilation. By means of simulation, it is possible to significantly shorten the drying time of the container corners, and to achieve the purpose of energy saving.

Hydrodynamic Integrated Optimization of Two-D Hydrofoil Based on Kriging Model

2011 ◽  
Vol 421 ◽  
pp. 651-656 ◽  
Author(s):  
Zhuo Yi Yang ◽  
Ting Gao ◽  
Yong Jie Pang ◽  
Yan Ma
Keyword(s):  
Genetic Algorithm ◽  
Optimal Design ◽  
Design Of Experiment ◽  
Cfd Simulation ◽  
Pressure Coefficient ◽  
Kriging Model ◽  
Weighted Sum ◽  
Hydrodynamic Calculations ◽  
The Cost ◽  
Single Objective

Abstract. It is accurate to use CFD hydrodynamic model in optimal design, but its efficiency is low. According to variables design of experiment was arranged, then kriging model was established to by CFD hydrodynamic calculations of two-D hydrofoil. The two objectives which were the maximal ration of lift to resistance and minimal min-pressure coefficient were linearly weighted sum to a single objective. Genetic algorithm was carried out to solve the hydrodynamic performances optimization of the hydrofoil. After optimization, the ration of lift to resistance was improved and min-pressure coefficient was increased. The result shows that the Kriging model can reflect the identity of the objective, effectively reduce the cost of CFD simulation.

scholarly journals Development of 3D Models of Knits from Multi-Filament Ultra-Ftrong Yarns for Theoretical Modelling of Air Permeability

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3489
Author(s):  
Tetiana Ielina ◽  
Liudmyla Halavska ◽  
Daiva Mikucioniene ◽  
Rimvydas Milasius ◽  
Svitlana Bobrova ◽  
...  
Keyword(s):  
Cfd Simulation ◽  
3D Models ◽  
Air Permeability ◽  
Theoretical Modelling ◽  
Loop Model ◽  
Flow Process ◽  
Cross Sectional ◽  
Characteristic Points ◽  
Order Spline ◽  
Sectional Shape

The work is devoted to the study of the geometric parameters of a knitted loop. It has been found that the optimal model is a loop model detailed at the yarn level, which considers the change in the cross-sectional shape and sets the properties of the porous material in accordance with the internal porosity of the yarn. A mathematical description of the coordinates of the characteristic points of the loop and an algorithm for calculating the coordinates of the control vertices of the second order spline, which determine the configuration of the yarn axes in the loop, are presented in this work. To create 3D models, Autodesk AutoCAD software and Structura 3D software, developed in the AutoLisp programming language, were used. The simulation of the air flow process was carried out in the Autodesk CFD Simulation environment. For the experimental investigation, plane knits from 44 tex × 3 linear density ultra-high molecular weight polyethylene yarns were produced, and their air permeability was tested according to Standard DSTU ISO 9237:2003. The results obtained during the laboratory experiment and simulation differed by less than 5%.

Numerical Simulation and Structure Optimization of Converter Gas Evaporative Cooler

2013 ◽  
Author(s):  
Zeyi Jiang ◽  
Pengyuan Chen ◽  
Pan Liu ◽  
Guanghe Tian
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Cfd Simulation ◽  
Engineering Application ◽  
Discrete Phase Model ◽  
Engineering Project ◽  
Two Phase ◽  
Flow Process ◽  
Evaporative Cooler ◽  
Cfd Method

In Lurgi-Thyssen dedusting system of steelmaking converter, the evaporative cooler represents a crucial operating unit, in which the hot dust-laden flue gas has to be cooled by saturation with water. The cooling process of the gas consists of gas-liquid two phase flow and interphase heat and mass transfer. In this paper, k-epsilon standard equations and Lagrange discrete phase model are employed to describe the gas turbulent flow and the heat/mass transfer with droplet evaporation individually. The computational fluid dynamics (CFD) simulation for practical engineering project shows that the large-flux cooling gas is commonly constructed in a non-uniform flow caused by the sharp turnings at the inlet and outlet channels. The unevenness of velocity distribution and the effective cooling height are defined in this paper to evaluate the cooling flow process. A series of newly designed structures with guide plate are investigated by CFD method to eliminate the problems with the non-uniformity. The results of numerical simulation show that optimal designed guide ring plate could improve the flow uniformity and the heat transfer. The investigations have been used to guide the engineering application.

Optimization of Diffuser Parameters for Mixing Fans in Agricultural Buildings

2018 ◽  
Vol 34 (2) ◽  
pp. 437-444 ◽  
Author(s):  
Tao Ding ◽  
Lumeng Fang ◽  
Ji-Qin Ni ◽  
Zhengxiang Shi ◽  
Baoxi Sun ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Energy Efficiency ◽  
Optimal Design ◽  
Field Test ◽  
Cfd Simulation ◽  
Maximum Flow ◽  
Uniformity Coefficient ◽  
Wind Speeds ◽  
Average Wind ◽  
Flow Flux

Abstract. Mixing fans (MFFs) are widely used in ventilation of agricultural buildings to improve the uniformity of the air supply, thereby improving the ventilation efficiency. In order to improve the ventilation performance of MFFs, a new visor-shaped diffuser was designed and installed on a MFF. The angle and the length of the diffuser were crucial parameters that affected the performance of the MFFs with the diffusers. Thereby, in this study numerical simulation with 42 diffusers of different angles (ranged from 90-270°) and different lengths (ranged from 150-650 mm) with the MFF were studied with Computational Fluid Dynamics (CFD) simulation to acquire the optimal design of diffusers. The numerical simulation results show that the diffusers of 90°/450 mm, 120°/350 mm, and 150°/250 mm with jet lengths of up to 5.85, 5.90, and 5.85 m, respectively, had better performances among all the diffusers. The optimal prototype diffusers of 90°/450 mm, 120°/350 mm, and 150°/250 mm of MFFs were tested by laboratory study and field test. The test was conducted in wind speed distributions at distances of 0.5 to 1.0 m from the axial of MFFs. During the test, we evaluated the MFFs performance such as maximum flow flux, maximum energy efficiency, and non-uniformity coefficient. The diffuser of 150°/250 mm showed the best performance, increasing the flow flux and energy efficiency by 3.8% and 11%, respectively, and obtain higher axial wind speeds and larger non-uniformity coefficients. Finally, the diffusers of 150°/250 mm were tested in a free-stall dairy barn. The field test result shows that the diffusers of 150°/250 mm increased overall average wind speeds by 7.4% and local average wind speeds at bedding 1 and bedding 2 by 31.0% and 27.7%, respectively, which agreed with our numerical simulation and laboratory test. This optimal design of mixing fans could be applied to improve the air mixing in agricultural buildings. Keywords: Agricultural buildings, Diffuser, Mixing fan, Numerical simulation, Optimization.

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