Airflow Simulation of the Huge Telescope Assemble

2010 ◽  
Vol 439-440 ◽  
pp. 880-883
Author(s):  
Fu Zhao ◽  
Ping Wang ◽  
Yan Jue Gong ◽  
Yu De Liu ◽  
Hong Bin Xin
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Natural Convection ◽  
Temperature Distribution ◽  
Velocity Field ◽  
Three Dimensional ◽  
Horizontal Line ◽  
Air Velocity ◽  
Turbulent Airflow ◽  
Dynamics Method

With the three-dimensional computational fluid dynamics method, the airflow effects over the huge telescope assemble is investigated in this article. The distributing of velocity field and natural convection are studied by modeling and simulating the turbulent airflow of the huge telescope. Numerical simulations show the best observation direction is the 90o angle between the main optics axis and the horizontal line in which the air velocity distribution is the least. And the air temperature distribution and uniformity around the telescope are also provided by simulation.

Analyzing a Transit Subway Station during Fire Emergency using Computational Fluid Dynamics

1996 ◽  
Vol 1521 (1) ◽  
pp. 159-164 ◽  
Author(s):  
Sameer A. Abu-Zaid
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Mechanical Ventilation ◽  
Steady State ◽  
Temperature Distribution ◽  
Partial Differential Equations ◽  
Velocity Field ◽  
Differential Equations ◽  
Subway Station ◽  
Air Velocity

Computational fluid dynamics is used to analyze a transit subway station during fire emergency conditions. The analysis is based on solving the partial differential equations governing the transport of mass, momentum, and energy within the station geometry. A steady source of heat (e.g., fire) equivalent to 90 MBtu/hr is placed in the station. Steady state results for temperature distribution and air velocity field for three fire locations are presented. The results indicate that safe evacuation of patrons cannot be achieved without mechanical ventilation.

scholarly journals Impacts of building layout on pedestrian level wind comfort and gas pollutant diffusion

2021 ◽  
Author(s):  
Yi Yang ◽  
Tianxiao Zhang ◽  
Haiying Xie ◽  
Xiaoxiao Wang
Keyword(s):  
Fluid Dynamics ◽  
Adverse Effect ◽  
Computational Fluid Dynamics ◽  
Velocity Field ◽  
Simple Algorithm ◽  
Ansys Fluent ◽  
Building Layout ◽  
Wind Comfort ◽  
Dynamics Method ◽  
Pollutant Diffusion

Introduction: The impacts of building layout on pedestrian level wind comfort and gas pollutant diffusion are simulated using computational fluid dynamics method. Materials and methods: The control equations of flow and pollutant diffusion are solved by using ANSYS Fluent. The SIMPLE algorithm is selected for the pressure-velocity coupling. The data from wind tunnel experiment at Tokyo Polytechnic University is employed in the validation case. Results: The velocity field and turbulence intensity at pedestrian level under different building layouts are obtained. The distribution and evaluation of wind comfort grade and pollutant concentration are given. Conclusion: Building layouts have significant impacts on flow and pollutant diffusion at pedestrian level. The outward staggered layout of building group can improve both wind comfort grade and air quality, but the inward staggered layout has the adverse effect. Non-staggered layouts are the worst in terms of the wind comfort grade in this paper.

scholarly journals Computational Fluid Dynamics Modelling of the Heat Pump Drying of Banana: Preliminary Studies

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Folasayo T Fayose ◽  
Zhongjie Huan
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Temperature Distribution ◽  
Heat Pump ◽  
Three Dimensional ◽  
Velocity Gradients ◽  
Contour Plots ◽  
Computational Fluid Dynamics Cfd ◽  
Dynamics Modelling ◽  
Heat Pump Drying

The distribution of local temperature, moisture and velocity gradients obtained in CFD calculations can be used to develop models for predicting the parameters in a drying process. This article reports a preliminary result on the efforts to characterizing the performance of a heat pump dryer using Computational Fluid Dynamics (CFD). A three dimensional, pressure based, transient, laminar, incompressible model of heat pump drying of banana slices using Ansys 14.5 (15), a CFD package- FLUENT was investigated. Turbulent cases were also examined. The geometry was considered as elemental volume with symmetrical walls while the banana slices were designed as solids with pores containing a mixture of water and air. Parameters/variable/geometry investigated include velocity, moisture and temperature distribution of the air within the dryer and of the banana slices. The result of the numerical simulation was validated with experimental results from a heat pump dryer and there were agreements. The model is successful in predicting the temperature profile and mass fraction of moisture. Keywords— Ansys, Banana, Computational Fluid Dynamics (CFD), Contour plots, Drying, Velocity and temperature distribution

Optimization of a Minienvironment Design Using Computational Fluid Dynamics

1997 ◽  
Vol 40 (1) ◽  
pp. 29-34
Author(s):  
A. Tannous
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Geometric Model ◽  
Three Dimensional ◽  
Cross Contamination ◽  
Air Velocity ◽  
Design And Optimization ◽  
Tool Surface ◽  
Recirculation Zones ◽  
Finite Volume Approach

This paper discusses the use of a CFD (computational fluid dynamics) code for the design and optimization processes of a minienvironment mounted on a wafer process tool. The three-dimensional code was used to predict the air velocity flied and pressure distribution in the minienvironment based on a finite volume approach. The geometric model consists of the minienvironment, the tool surface, and the integrated I/O Indexer interfaces. The airflow in the minienvironment (with a conceptual design configuration) was simulated. The results prompted a design change. The new design has a desirable airflow for a more effective minienvironment performance. Particular attention was paid to air recirculation zones that could potentially trap particles generated during the process and to maintaining a positive differential pressure to prevent cross contamination. CFD was shown to be an important step in the design process.

Study on Temperature Distribution of a Honeycomb Regenerator during Preheating Process

2012 ◽  
Vol 170-173 ◽  
pp. 2699-2702
Author(s):  
Zhen Min Cui
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
High Temperature ◽  
Temperature Distribution ◽  
Numerical Model ◽  
Three Dimensional ◽  
Combustion Method ◽  
Outlet Temperature ◽  
High Temperature Air Combustion ◽  
Computational Fluid Dynamics Cfd

The HiTAC technology (High Temperature Air Combustion) is a reliable, industry proven combustion method. A three-dimensional numerical model is established which is for unsteady preheating process in honeycomb regenerator. The preheating period of honeycomb was simulated by means of computational fluid dynamics (CFD) software; the outlet temperature, temperature at lengthways of gas, and temperature at lengthways of honeycomb were obtained.

3D Numerical Simulation of Inner Flow in a Mixed-Flow Stirred Reactor

2014 ◽  
Vol 602-605 ◽  
pp. 650-652
Author(s):  
Hui Li ◽  
Rui Li Wang
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Velocity Field ◽  
Three Dimensional ◽  
3D Numerical Simulation ◽  
Mixed Flow ◽  
Stirred Reactor ◽  
Computational Fluid Dynamics Cfd ◽  
Simulated Effect

Based on the principle and method of computational fluid dynamics (CFD), using the software, FLUENT, the inner flow field in a mixed-flow stirred reactor was simulated and the flow details were studied roundly. This article analyzed the three-dimensional velocity field distribution and testified the reliability of numerical simulation to a certain extent. The simulated effect was proved effective. The results of this paper provided a good base and reference for the further research of the stirred reactor.

Numerical Analysis of Internal Flow in Mufflers with Complex Structures

2010 ◽  
Vol 29-32 ◽  
pp. 89-94
Author(s):  
Zhong Cai Zheng ◽  
Na Liu ◽  
Jian Li ◽  
Yan Gao ◽  
Hai Ou Chen
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Analysis ◽  
Velocity Field ◽  
Pressure Field ◽  
Three Dimensional ◽  
Internal Flow ◽  
Complex Structures ◽  
Simulation Results ◽  
Volume Models

This paper builds three-dimensional finite volume models for 4 different mufflers. Internal flow numerical analysis for mufflers is carried out with computational fluid dynamics software. Velocity field and pressure field are obtained to analyze the airflow influences on muffler performances. The corresponding regularities are obtained from simulation results, which provide a method for design optimization of mufflers.

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