scholarly journals Design of Effective Tunnel Ventilation System using Computational Fluid Dynamics

2020 ◽  
Vol 9 (1) ◽  
pp. 722-725
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Direction ◽  
Ventilation System ◽  
Longitudinal Direction ◽  
Realistic Model ◽  
Critical Parameters ◽  
Distribution Modelling ◽  
Different Temperatures ◽  
Convection Problem

A realistic model of a naturally ventilated tunnel with side ducts is analyzed by Computational Fluid Dynamics. This study accounts for the different temperatures of heat sources and the different domains as the phenomenon of smoke marching in the longitudinal direction is captured. The study accounts the domain to be air domain, and then CO domain. The effect of varying the heat intensity with the marching of smoke is analyzed in the research. Critical parameters like air flow direction and velocity of smoke are taken into account. The paper mainly focuses on temperature distribution, modelling the problem as a convection problem.

scholarly journals Simulation Analysis of a Ventilation System in a Smart Broiler Chamber Based on Computational Fluid Dynamics

Atmosphere ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 315 ◽  
Author(s):  
Shikai Zhang ◽  
Anlan Ding ◽  
Xiuguo Zou ◽  
Bo Feng ◽  
Xinfa Qiu ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Velocity ◽  
Working Conditions ◽  
Simulation Analysis ◽  
Ventilation System ◽  
Absolute Error ◽  
Maximum Absolute Error ◽  
Three Dimensional Model ◽  
Mesh Model

In this paper, a CFD (computational fluid dynamics) numerical calculation was employed to examine whether the ventilation system of the self-designed smart broiler house meets the requirements of cooling and ventilation for the welfare in poultry breeding. The broiler chamber is powered by two negative pressure fans. The fans are designed with different frequencies for the ventilation system according to the specific air temperature in the broiler chamber. The simulation of ventilation in the empty chamber involved five working conditions in this research. The simulation of ventilation in the broiler chamber and the simulation of the age of air were carried out under three working conditions. According to the measured dimensions of the broiler chamber, a three-dimensional model of the broiler chamber was constructed, and then the model was simplified and meshed in ICEM CFD (integrated computer engineering and manufacturing code for computational fluid dynamics). Two models, i.e., the empty chamber mesh model and the chamber mesh model with block model, were imported in the Fluent software for calculation. In the experiment, 15 measurement points were selected to obtain the simulated and measured values of wind velocity. For the acquired data on wind velocity, the root mean square error (RMSE) was 19.1% and the maximum absolute error was 0.27 m/s, which verified the accuracy of the CFD model in simulating the ventilation system of the broiler chamber. The boundary conditions were further applied to the broiler chamber model to simulate the wind velocity and the age of air. The simulation results show that, when the temperature was between 32 and 34 °C, the average wind velocity on the plane of the corresponding broiler chamber (Y = 0.2 m) was higher than 0.8 m/s, which meets the requirement of comfortable breeding. At the lowest frequency of the fan, the oldest age of air was less than 150 s, which meets the basic requirement for broiler chamber design. An optimization idea is proposed for the age of air analysis under three working conditions to improve the structure of this smart broiler chamber.

Research on Computational Fluid Dynamics with Effect of Grid Quality on the Accuracy of Simulated Results of Two Dimensional Low-Speed Parallel Flow

2014 ◽  
Vol 685 ◽  
pp. 232-235
Author(s):  
Ning Kang ◽  
Yuan Cao
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Direction ◽  
Grid Generation ◽  
Domain Size ◽  
Parallel Flow ◽  
Computational Error ◽  
Two Dimensional ◽  
Low Speed ◽  
Generation Costs

In the field of computational fluid dynamics, grid generation costs most of work. The accuracy and reliability of the simulated results depend directly on grid quality. The two dimensional parallel flow with low speed was used to study the effect of grid quality on simulated results. Several conclusions are obtained. The computational error decreases with the increase of domain size in flow direction. Too many grids in flow direction will lead to bigger round-off error, while too few grids will make it harder to catch the correct flow. The increase of grid quantity in the direction perpendicular to flow direction will decrease the computational error, but the effect is not obvious. Increasing the grid quantity in the area near the wall will decrease the computational error.

Stress analyses of various curvature arched groundsills

2020 ◽  
Author(s):  
Yu-Jen Hou ◽  
Hung-Pin Huang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Structural Analysis ◽  
Water Conservation ◽  
Maximum Stress ◽  
Flow Direction ◽  
Three Dimensional ◽  
Analysis Software ◽  
Ansys Fluent ◽  
Soil And Water

<p>In Taiwan, arched groundsill is frequently used as soil-and-water conservation structures for stabilizing creek bed, guiding flow direction, decreasing the slope of creek bed and reducing the scour effect. Even though much more arched grounsill was built in wild creek recently, its mechanical mechanism is still unclear.</p><p>In order to explore the characteristics of arched groundsill, this study intends to find out the scale of stress, moment and displacement distribution on the various curvature arched groundsills by means of the structural analysis software, ABAQUS. Simultaneously, the three-dimensional computational fluid dynamics software, ANSYS-FLUENT, is applied to show the flow condition of different setups. Preliminary result shows that the maximum stress and displacement of arched groundsill increase with curvature. The maximum moment decreases slightly firstly and increases sharply later with curvature.</p>

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