scholarly journals Numerical Description of Jet and Duct Ventilation in Underground Garage after LPG Dispersion

Processes ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 53
Author(s):  
Zdzislaw Salamonowicz ◽  
Malgorzata Majder-Lopatka ◽  
Anna Dmochowska ◽  
Aleksandra Piechota-Polanczyk ◽  
Andrzej Polanczyk
Keyword(s):  
Fluid Dynamic ◽  
Three Dimensional ◽  
Jet Ventilation ◽  
Large Area ◽  
Ansys Fluent ◽  
Potential Health ◽  
Risk Levels ◽  
Migration Rates ◽  
Fluent Software ◽  
Hazardous Zone

Contamination of toxic and odorous gases emitted from stacks in buildings located in an urban environment are potential health hazards to citizens. A simulation using the computational fluid dynamic technique may provide detailed data on the flammable region and spatial dispersion of released gases. Concentrations or emissions associated with garage sources and garage-to-house migration rates are needed to estimate potential exposures and risk levels. Therefore, the aim of the study was to use an original mathematical model to predict the most accurate locations for LPG sensors in an underground garage for vehicles powered with LPG. First, the three-dimensional geometry of an underground garage under a multi-family building was reconstructed. Next, two types of ventilation, jet and duct, were considered, and different sources of LPG leakage were assumed. Then, the Ansys Fluent software was applied as a solver, and the same initial value of released LPG (5 kg) was assumed. As a simplification, and to avoid the simulation of choked outflow, the emission from a large area was adopted. The results showed stagnation areas for duct ventilation in which gas remained for both the jet and duct ventilation. Moreover, it was observed that the analyzed gas would gather in the depressions of the ground in the underground garage, for example in drain grates, which may create a hazardous zone for the users of the facility. Additionally, it was observed that for jet ventilation, turbulence appearance sometimes generated differentiated gas in an undesirable direction. The simulation also showed that for blowing ventilation around the garage, and for higher LPG leakage, a higher cloud of gas that increased probability of ignition and LPG explosion was formed. Meanwhile, for jet ventilation, a very low concentration of LPG in the garage was noticed. After 35 s, LPG concentration was lower than the upper explosive limit. Therefore, during the LPG leakage in an underground garage, jet ventilation was more efficient in decreasing LPG gas to the non-explosive values.

The inlet flow structure of a conceptual open-nose supersonic drone

2021 ◽  
pp. 095441002098304
Author(s):  
Eiman B Saheby ◽  
Xing Shen ◽  
Anthony P Hays ◽  
Zhang Jun
Keyword(s):  
Flow Structure ◽  
Stokes Equations ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Computational Fluid Dynamic Simulation ◽  
Navier Stokes ◽  
Ansys Fluent ◽  
Navier Stokes Equations ◽  
Aerodynamic Efficiency ◽  
Performance Effects

This study describes the aerodynamic efficiency of a forebody–inlet configuration and computational investigation of a drone system, capable of sustainable supersonic cruising at Mach 1.60. Because the whole drone configuration is formed around the induction system and the design is highly interrelated to the flow structure of forebody and inlet efficiency, analysis of this section and understanding its flow pattern is necessary before any progress in design phases. The compression surface is designed analytically using oblique shock patterns, which results in a low drag forebody. To study the concept, two inlet–forebody geometries are considered for Computational Fluid Dynamic simulation using ANSYS Fluent code. The supersonic and subsonic performance, effects of angle of attack, sideslip, and duct geometries on the propulsive efficiency of the concept are studied by solving the three-dimensional Navier–Stokes equations in structured cell domains. Comparing the results with the available data from other sources indicates that the aerodynamic efficiency of the concept is acceptable at supersonic and transonic regimes.

scholarly journals NUMERICAL SIMULATION OF AIRFLOW AROUND VEHICLE MODELS

2018 ◽  
Vol 56 (3) ◽  
pp. 370
Author(s):  
Nguyen Van Thang ◽  
Ha Tien Vinh ◽  
Bui Dinh Tri ◽  
Nguyen Duy Trong
Keyword(s):  
Numerical Simulation ◽  
Kinetic Energy ◽  
Three Dimensional ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Forces ◽  
Dissipation Energy ◽  
Ansys Fluent ◽  
Car Model ◽  
Airflow Field ◽  
Fluent Software

This article carries out the numerical simulation of airflow over three dimensional car models using ANSYS Fluent software. The calculations have been performed by using realizable k-e turbulence model. The external airflow field of the simplified BMV M6 model with or without a wing is simulated. Several aerodynamic characteristics such as pressure distribution, velocity contours, velocity vectors, streamlines, turbulence kinetic energy and turbulence dissipation energy are analyzed in this study. The aerodynamic forces acting on the car model is calculated and compared with other authors.

scholarly journals Three dimensional cyclonic turbulent flow structures at various geometries, inlet-outlet orientations and operating conditions

2018 ◽  
Vol 12 (4) ◽  
pp. 4300-4328
Author(s):  
Pasymi Pasymi ◽  
Y. W. Budhi ◽  
A. Irawan ◽  
Y. Bindar
Keyword(s):  
Flow Structure ◽  
Three Dimensional ◽  
Axial Flow ◽  
Operating Conditions ◽  
Flow Structures ◽  
Ansys Fluent ◽  
Vortex Pattern ◽  
Fluent Software ◽  
Simulation Results ◽  
Vortex Patterns

Flow structure inside a chamber greatly determines the process performances. Therefore, the flow structure inside a chamber are often constructed in such a way as an effort to obtain equipment performances in accordance with the expectations. This study explored flow structure inside several chamber geometries and operating conditions. Three types of chamber, namely; GTC, DTC and TJC were set as the investigated chambers. The Computational Fluid Dynamics technique, supported by some experimental data from the literature, is used as an investigation method. The RANS based models, under Ansys-Fluent software were used in this numerical investigation. Simulation results revealed that the flow structures of GTC and DTC are predominantly created by spiral and vortex patterns. The vortex stabilizer diameter in the GTC affects the vortex pattern, velocity profile and pressure drop. The flow structure of DTC presents the most complex behavior. The flow structure inside TJC, in the case of unconfined outlet boundary, is characterized by the helical and wavy jet pattern. This structure is determined by the initial tangential intensity (IIT) and the inlet aspect ratio (RIA). The structures of vortex, helical, and wavy axial flow are properly constructed and visualized in this paper. There is no a turbulence model which is always superior to the other models, consistently. The standard k-ε model exhibits the realistic and robust performances among  all of investigatied cases.

scholarly journals Cooling Effectiveness of a Data Center Room under Overhead Airflow via Entropy Generation Assessment in Transient Scenarios

Entropy ◽  
2019 ◽  
Vol 21 (1) ◽  
pp. 98 ◽  
Author(s):  
Luis Silva-Llanca ◽  
Marcelo del Valle ◽  
Alfonso Ortega ◽  
Andrés Díaz
Keyword(s):  
Heat Transfer ◽  
Entropy Generation ◽  
Data Center ◽  
Distribution System ◽  
Heat Exchangers ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Ansys Fluent ◽  
Cooling Effectiveness ◽  
Dynamic Heat Transfer

Forecasting data center cooling demand remains a primary thermal management challenge in an increasingly larger global energy-consuming industry. This paper proposes a dynamic modeling approach to evaluate two different strategies for delivering cold air into a data center room. The common cooling method provides air through perforated floor tiles by means of a centralized distribution system, hindering flow management at the aisle level. We propose an idealized system such that five overhead heat exchangers are located above the aisle and handle the entire server cooling demand. In one case, the overhead heat exchangers force the airflow downwards into the aisle (Overhead Downward Flow (ODF)); in the other case, the flow is forced to move upwards (Overhead Upward Flow (OUF)). A complete fluid dynamic, heat transfer, and thermodynamic analysis is proposed to model the system’s thermal performance under both steady state and transient conditions. Inside the servers and heat exchangers, the flow and heat transfer processes are modeled using a set of differential equations solved in MATLAB™. This solution is coupled with ANSYS-Fluent™, which computes the three-dimensional velocity, temperature, and turbulence on the Airside. The two approaches proposed (ODF and OUF) are evaluated and compared by estimating their cooling effectiveness and the local Entropy Generation. The latter allows identifying the zones within the room responsible for increasing the inefficiencies (irreversibilities) of the system. Both approaches demonstrated similar performance, with a small advantage shown by OUF. The results of this investigation demonstrated a promising approach of data center on-demand cooling scenarios.

scholarly journals An investigation of the aerodynamic parameters for Solar Plane wing profile using CFD modelling

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Marek Jaszczur ◽  
Karolina Papis ◽  
Michał Książek ◽  
Grzegorz Czerwiński ◽  
Gabriel Wojtas ◽  
...  
Keyword(s):  
Fluid Dynamic ◽  
Model Development ◽  
Solar Panels ◽  
Cfd Modelling ◽  
Ansys Fluent ◽  
Induced Drag ◽  
Image Velocimetry ◽  
Fluent Software ◽  
Aerodynamic Parameters ◽  
Solar Powered

The technology of solar-powered aerial vehicles requires enormous financial support and further development. For this purpose, the computational fluid dynamic can be used. In order to carry out necessary analyses and model development in this research, ANSYS Fluent software was used. Using the first version of the AGH Solar Plane model, preliminary analysis of lift, drag and tearing off the stream were performed. Numerical experiments made it possible to verify many various profiles and final selection that the best suits the target model. Through these studies, it was also possible to analyse fluid flow at various speeds and angles of attack. This provided an insight into important aspects of vehiclesaerodynamic design, which should be taken into account when making the second model version. At this stage, the classical and laminar - Wortmann aerodynamic profiles were selected on the basis of the aerodynamic perfection criterion. Moreover, four new geometries were prepared on which the flattening of upper surfaces (for fixing solar panels) was tested. The results of the numerical analysis were validated in the aerodynamic tunnel using particle image velocimetry method. Taking into account all analyses, a number of recommendations have been prepared that will be implemented in order to create an aircraft, which meets all target requirements. Some of these hints were: testing new ways of connecting the wing to the nacelle, which would reduce the drag as well as considering the usage of winglets in order to minimize induced drag.

scholarly journals NUMERICAL RESEARCH OF THE MOISTURE CONDENSATION ELIMINATION IN THE CABIN OF THE UNIFIED TECHNOLOGICAL ELECTRIC TRANSPORT VEHICLE

2018 ◽  
Vol 15 (4) ◽  
pp. 538-546
Author(s):  
N. M. Filkin ◽  
A. M. Tatarkin
Keyword(s):  
Three Dimensional ◽  
Electric Transport ◽  
Three Dimensional Model ◽  
Ansys Fluent ◽  
Air Ventilation ◽  
Fluent Software ◽  
Moisture Condensation ◽  
Transport Vehicle ◽  
Numerical Research ◽  
Forced Air

Introduction. This article deals with the problem of moisture condensation inside the cabin of the technological electric transport vehicle. The hypothesis of using the forced air ventilation in the cabin is substantiated, by which such problem could be solved.Materials and methods. The article describes the application of the ANSYS Fluent Software Package to assess the effect of the location and shape of the ducts on the ventilation process inside the cabin. Accordingly, the key stages of air flow modeling in this program are considered.Results. The main content of the research is to analyze the modeling airflow process in the cabins with a different configuration of inlet and outlet nozzles. Therefore, basing on the analysis of the obtained airflow velocity contours, the conclusion is made about the rational arrangement of the inlet and outlet channels.Discussion and conclusions. The conclusion is made about the necessity of the further research that would refer to creating a three-dimensional model of the cabin. The results of the research as well as resolutions are taken into account.

Thermal Management of Electronic Components by Using Computational Fluid Dynamic (CFD) Software, FLUENTTM in Several Material Applications (Epoxy, Composite Material & Nanosilver)

2013 ◽  
Vol 795 ◽  
pp. 141-147 ◽  
Author(s):  
M. Mazlan ◽  
A. Rahim ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
W. Razak ◽  
A.F. Zubair ◽  
...  
Keyword(s):  
Thermal Management ◽  
3D Model ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Junction Temperature ◽  
Electronic Components ◽  
Different Types ◽  
Fluent Software ◽  
Transfer Problems ◽  
Heat And Fluid Flow

This paper presents the thermal management of electronic components, microprocessor by using three dimensional numerical analysis of heat and fluid flow in computer. 3D model of microprocessors is built using GAMBIT and simulated using FLUENT software. The study was made for four microprocessors arranged in line under different types of materials, inlet velocities and package (chip) powers. The results are presented in terms of average junction temperature and thermal resistance of each package The junction temperature is been observed and it was found that the junction temperature of the microprocessors is not exceed 70o C. It also found that the (chip) powers and inlet velocities are the most important elements to control and manage the junction temperature. The strength of CFD software in handling heat transfer problems is proved to be excellent.

scholarly journals Computational Investigation of The Exhalation Process with and Without Wearing a Protective Mask

2021 ◽  
Vol 83 (2) ◽  
pp. 149-163
Author(s):  
Islam Ahmed Mohamed Mohamed El Sayed ◽  
Ahmed Farouk AbdelGawad
Keyword(s):  
Three Dimensional ◽  
Biological Anthropology ◽  
Ansys Fluent ◽  
Nasal Airways ◽  
Contagious Diseases ◽  
Surgical Masks ◽  
Temporary Solution ◽  
Fluent Software ◽  
3D Printed ◽  
Protective Mask

This paper shows different simulations of airflow patterns for the human face during exhalation with and without wearing a protective mask. The nasal airways were defined based on biological anthropology and medicine instructions. A three-dimensional body-manikin of African athlete of 1.8 meters tall was employed to the expiration (exhalation) flow study using ANSYS-Fluent software. There were two different mask models included in the flow simulations and were manufactured by means of 3D-printing technology. The two manufactured masks were designed using SolidWorks software. The study was carried out four times during the exhalation process of a human wearing the two masks and without wearing them. The velocity magnitudes were significantly different while wearing the mask in comparison to the cases of not wearing it. The results demonstrate the capability of using 3D-printed masks as a replacement of the traditional medical masks (i.e., N95 and surgical masks) with retaining the same functions of the protective mask. Thus, based on the present study and due to the great shortage of surgical and medical masks availability locally and globally, the 3D-printed masks might be a temporary solution to limit the vast spread of contagious diseases like the dangerous COVID-19 outbreak.

The Comparison between Four PLCC Packages and Eight PLCC Packages in Personal Computer (PC) Using Computational Fluid Dynamic (CFD), FLUENT SoftwareTM Using Epoxy Moulding Compound Material (EMC)

2013 ◽  
Vol 795 ◽  
pp. 174-181 ◽  
Author(s):  
Mohamed Mazlan ◽  
A. Rahim ◽  
M.A. Iqbal ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
W. Razak ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Printed Circuit Board ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Circuit Board ◽  
Junction Temperature ◽  
Moulding Compound ◽  
Fluent Software ◽  
Chip Carrier ◽  
Flow Through

The paper present the three dimensional numerical analysis of heat and fluid flow through Plastic Leaded Chip Carrier (PLCC) packages in inline orientation horizontally mounted on a printed circuit board in a wind tunnel is carried out using a commercial CFD code, FLUENTTM by using Epoxy Moulding Compound (EMC) as a main material. The study was made for four and eight packages with different Reynolds Number and package chip powers. The results are presented in term of junction temperature for four and eight PLCC package under different conditions. It is observed the chip temperatures of eight PLCC packages have higher junction temperature compare to four PLCC packages due to effect of other PLCC because of space and gap between PLCC that have more number of PLCC is smaller. Hence it makes junction temperature of eight PLCC higher compare to four PLCC packages. Moreover, the junction temperature of the packages decreases with increase in Reynolds Number.

scholarly journals The Use of Stratification Effects for Water Quality Improvement in Case of Drinking Water Abstraction from Surface Water Bodies

2011 ◽  
pp. 89-104
Author(s):  
Keyword(s):  
Water Intake ◽  
Three Dimensional ◽  
Water Bodies ◽  
Ansys Fluent ◽  
Water Abstraction ◽  
Vertical Heterogeneity ◽  
Fluent Software ◽  
Study Case ◽  
The City ◽  
Dimensional Statement

With the Chusovckoy water intake of the city of Perm as a study case specific features of organization of selective water abstraction from water bodies in the conditions of essential vertical heterogeneity of limiting contamination ingredients content have been considered. The watercourse vertical stratification is caused by the Chusovaya and Sylva rivers (with substantially different hydro/chemical regime) confluence in direct vicinity of the water intake. Simulation computing experiments in three-dimensional statement with the use of ANSYS Fluent software have been carried out to assess the bottom barriers’ effectiveness in arrangement of selective water abstraction.

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