scholarly journals CFD Comparative Study Between Different Forms of Solar Greenhouses and Orientation Effect

2021 ◽  
Vol 39 (2) ◽  
pp. 433-440
Author(s):  
Mohammed Aissa ◽  
Azzedine Boutelhig
Keyword(s):  
Numerical Study ◽  
Physical Problem ◽  
Tunnel Structure ◽  
Safety Properties ◽  
Ansys Fluent ◽  
Climate Conditions ◽  
Flow Equations ◽  
Tunnel Design ◽  
Fluent Software ◽  
The Difference

Only scarce studies that were adopted have considered two properties, the structure safety and energy, where the aero-dynamic and energetic phenomena were taken into account simultaneously in the agricultural greenhouses area. In fact, in this numerical study, the response of the greenhouse has been investigated in outside climate conditions, by considering the orientation relatively to the wind direction velocity and solar trajectory. A resolution of the physical problem combined between the thermal and dynamical fluid flow equations have been based on the Ansys Fluent software. The results showed that the difference between inside and outside air temperature of greenhouse has been strongly affected by the reorientation of the tunnel greenhouse structure, or by the design of the tunnel structure that was adopted in the dome and chapel shape. Moreover, the safety properties of greenhouse structure linked to the drag stress can be developed when based on the interaction fluid-structure analysis. In this view, a temperature profile evolution versus different heights inside greenhouse was highlighted. As well as like continues of our previous study of the drag evolution over tunnel design body proved by the results found in the literature will be compared with chapel and dome designs.

An Investigation of the Effect of interrupted fin arrangements on the Thermal Performance of a Heat Sink under a Free Convection Condition

2019 ◽  
Vol 7 (1) ◽  
pp. 43-53
Author(s):  
Abbas Jassem Jubear ◽  
Ali Hameed Abd
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Natural Convection ◽  
Thermal Performance ◽  
Heat Sink ◽  
Numerical Study ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Steady State Heat ◽  
Steady State Heat Transfer

The heat sink with vertically rectangular interrupted fins was investigated numerically in a natural convection field, with steady-state heat transfer. A numerical study has been conducted using ANSYS Fluent software (R16.1) in order to develop a 3-D numerical model.  The dimensions of the fins are (305 mm length, 100 mm width, 17 mm height, and 9.5 mm space between fins. The number of fins used on the surface is eight. In this study, the heat input was used as follows: 20, 40, 60, 80, 100, and 120 watts. This study focused on interrupted rectangular fins with a different arrangement and angle of the fins. Results show that the addition of interruption in fins in various arrangements will improve the thermal performance of the heat sink, and through the results, a better interruption rate as an equation can be obtained.

Numerical study of the ejection properties of a jet flowing into flooded space

2020 ◽  
Author(s):  
A.Yu. Lutsenko ◽  
V.A. Kriushin
Keyword(s):  
Pressure Distribution ◽  
Nozzle Exit ◽  
Software Package ◽  
Numerical Study ◽  
Supersonic Jet ◽  
Underlying Surface ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Underexpanded Supersonic Jet ◽  
Jet Axis

The purpose of the study was to carry out a numerical simulation of the interaction of an underexpanded supersonic jet flowing into a flooded space with a normally located obstacle, and with the underlying surface. We performed the calculations in the ANSYS Fluent software package and presented flow patterns. For the case when the obstacle is located normally to the axis of the jet, we compared the pressure distribution in the radial direction with experimental data and made a conclusion about the changes in the integral load on the wall with a change in the distance to the nozzle exit. For the case when the obstacle is parallel to the jet axis, we presented the pressure distribution along the wall in the plane of symmetry, estimated the relative net force acting on the underlying surface, analyzed the nature of its change at various values of the off-design coefficient, the Mach number on the nozzle exit and the distance to the jet axis.

scholarly journals NUMERICAL STUDY FOR INTERRUPTED RECTANGULAR FINS IN A NATURAL CONVECTION FIELD

2019 ◽  
Vol 11 (2) ◽  
pp. 216-228
Author(s):  
Ass. Prof. Dr. Abbas Jassem Jubear ◽  
Ali Hameed Abd
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Natural Convection ◽  
Numerical Model ◽  
Heat Sink ◽  
Numerical Study ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Steady State Heat ◽  
Steady State Heat Transfer

The heat sink with vertically rectangular interrupted fins investigated numerically in a natural convection field, and with steady-state heat transfer. Numerical study has been conducted using ANSYS Fluent software (R16.1) in order to develop a 3-D numerical model.  The dimensions of fins are (305 mm length, 100 mm width, 17 mm height, and 9.5 mm space between fins). The number of fins used on the surface are eight. In this study, the heat input that is  used as follow (20, 40, 60, 80, 100, and 120 watts). The study is focused on interrupted rectangular fins with different arrangement of fins. The results show that the addition of interruption fins in various arrangements will improve the thermal performance of the heat sink, and through the results, a better interruption rate obtained as an equation.                                                         

scholarly journals Performance Assessment of a Triangular Integrated Collector Using Neural Networks

2020 ◽  
Vol 10 (1) ◽  
pp. 175-181
Author(s):  
Omer K. Ahmed ◽  
Raid W. Daoud ◽  
Ruaa H. Ali Al-Mallah
Keyword(s):  
System Performance ◽  
Solar Collector ◽  
Numerical Study ◽  
Operating Period ◽  
Ansys Fluent ◽  
Test Conditions ◽  
Backpropagation Network ◽  
Optimum Geometry ◽  
Internal Partition ◽  
Fluent Software

A numerical study is achieved on a new shape of temperature saver solar collector using an artificial neural network. The storage collector is a triangle face and a right triangle pyramid for the volumetric shape. It is obtained by cutting a cube from one upper corner at 45°, down to the opposite hypotenuse of the base of the cube. The numerical study was carried out using the computational fluid dynamics code (ANSYS-Fluent) software with natural convection phenomenon in the pyramid enclosure. Elman backpropagation network is used for his ability to find the nearest solution with the smallest error rate. The network consists of three layers, each of different corresponding weights. The results show that the temperature and velocity distributions throughout the operating period were obtained. The influence of introducing an internal partition inside the triangular storage collector was investigated. Also the optimum geometry and location for this partition were obtained. The enhancement was best at y = 0.25 m, whereas the height of triangular collector was 0.5 m. The hourly system performance was evaluated for all test conditions. The performance of the NN to train a model for this work was 0.000207, while the error of the calculation was 1×10-2 as average.

scholarly journals Experimental and Numerical Study on Supersonic Ejectors Working with R-1234ze(E)

2018 ◽  
Vol 180 ◽  
pp. 02047 ◽  
Author(s):  
Jan Kracik ◽  
Vaclav Dvorak ◽  
Vu Nguyen Van ◽  
Kamil Smierciew
Keyword(s):  
Numerical Study ◽  
Renewable Energy Sources ◽  
Electric Energy ◽  
Numerical Data ◽  
Working Fluid ◽  
Ansys Fluent ◽  
Environment Friendly ◽  
Fluent Software ◽  
Develop Environment ◽  
Good Agreement

These days, much effort is being put into lowering the consumption of electric energy and involving renewable energy sources. Many engineers and designers are trying to develop environment-friendly technologies worldwide. It is related to incorporating appropriate devices into such technologies. The object of this paper is to investigate these devices in connection with refrigeration systems. Ejectors can be considered such as these devices. The primary interest of this paper is to investigate the suitability of a numerical model for an ejector, which is incorporated into a refrigeration system. In the present paper, there have been investigated seven different test runs of working of the ejector with a working fluid R-1234ze(E). Some of the investigated cases seem to have a good agreement and there are no significant discrepancies between them, however, there are also cases that do not correspond to the experimental data at all. The ejector has been investigated in both on-design and off-design working modes. A comparison between the experimental and numerical data (CFD) performed by Ansys Fluent software is presented and discussed for both an ideal and a real gas model. In addition, an enhanced analytical model has been introduced for all runs of the ejector.

scholarly journals Assessment the Performance of the Triangular Integrated Collector

2018 ◽  
Vol 6 (4) ◽  
pp. 171-176
Author(s):  
Omer Kh. Ahmed
Keyword(s):  
Solar Collector ◽  
Numerical Study ◽  
Operating Period ◽  
Ansys Fluent ◽  
Triangular Face ◽  
Triangular Pyramid ◽  
Test Conditions ◽  
Optimum Geometry ◽  
Internal Partition ◽  
Fluent Software

A numerical study was achieved on a new design of storage solar collector. The storage collector is a triangular face and a right triangular pyramid for the volumetric shape. It is obtained by cutting a cube from one upper corner at 45o, down to the opposite hypotenuse of the base of the cube. The numerical study was carried out using the computational fluid dynamics code (ANSYS-Fluent) software with natural convection phenomenon in the pyramid enclosure. The results show that, the temperature and velocity distributions throughout the operating period were obtained. The influence of introducing an internal partition inside the triangular storage collector was investigated. Also the optimum geometry and location for this partition were obtained. The enhancement was best at y= 0.25 m whereas the height of triangular collector was 0.5 m. The hourly system performance was evaluated for all test conditions.

scholarly journals NUMERICAL STUDY COMPARING THE INCIDENCE INFLUENCE BETWEEN REALISTIC WAVE AND REGULAR WAVE OVER AN OVERTOPPING DEVICE

2019 ◽  
Vol 18 (1) ◽  
pp. 46
Author(s):  
R. G. Hübner ◽  
P. H. Oleinik ◽  
W. C. Marques ◽  
M. N. Gomes ◽  
E. D. dos Santos ◽  
...  
Keyword(s):  
Numerical Study ◽  
Fluid Dynamic ◽  
Multiphase Model ◽  
Regular Wave ◽  
Sea State ◽  
Fluent Software ◽  
The Difference ◽  
Discrete Values ◽  
Table Data ◽  
Volume Method

This work presents a numerical study to evaluate the difference between the fluid dynamic behavior of an overtopping device subjected to the incidence of a realistic wave when compared to a regular one; being this regular wave representative of the considered realistic sea state. To do so, the FLUENT software was employed, which is a Computational Fluid Dynamics package based on the Finite Volume Method. The regular wave was generated through a User Defined Function (UDF) that imposes its velocities components as boundary conditions of prescribed velocity. On the other hand, for the realistic wave it was used a methodology to impose the realistic components velocities from transient discrete values, named Table Data (TD) in FLUENT software. For both cases the Volume of Fluid (VOF) multiphase model was applied in the treatment of the water-air interaction. The results showed that the amount of water accumulated in the reservoir for the realistic sea state was 2.46 higher than for the regular wave. This is a relevant finding, since several researches about Overtopping device efficiency were promoted considering only the incidence of regular wave.

scholarly journals Experimental and Numerical Study of Collector Geometry Effect on Solar Chimney Performance

2017 ◽  
Vol 12 (4) ◽  
pp. 59-71
Author(s):  
Aseel K. Shyaa ◽  
Rafea A. H. Albaldawi ◽  
Maryam Muayad Abbood
Keyword(s):  
Power Plant ◽  
Numerical Study ◽  
Governing Equations ◽  
Solar Chimney ◽  
Ansys Fluent ◽  
Glass Cover ◽  
Pilot Work ◽  
Fluent Software ◽  
Design Velocity ◽  
Solar Chimney Power Plant

There have been many advances in the solar chimney power plant  since 1930 and the first pilot work was built in Spain (Manzanares) that produced 50 KW. The solar chimney power plant is considered of a clean power generation that needs to be investigated  to enhance the performance by studying the effect of changing the area of passage of air to enhance the velocity towards the chimney to maximize design velocity. In this experimental and numerical study, the reduction area of solar collector was investigated. The reduction area that mean changing the height of glass cover from the absorbing plate (h1=3.8cm, h2=2.6cm and h3=1.28cm). The numerical study was performed using ANSYS Fluent software package (version 14.0) to solve governing equations. The aim of this work was to study the effect of change the height of reduction area to the design velocity (velocity move the blade of turbine at inlet in the chimney). The results showed that the third height (h3=1.28cm) gives the best result because when decreasing the height between the glass cover and absorbing plate, the area between them decreased and the design velocity increased then the efficiency of solar chimney model was increased.

scholarly journals Simulation and experimental study of novel cascade solar still

2021 ◽  
Vol 297 ◽  
pp. 01002
Author(s):  
Nidal Mouhsin ◽  
Mariam Bouzaid ◽  
Mourad Taha-Janan ◽  
Mohamed Oubrek
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Solar Still ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Climate Conditions ◽  
Fluent Software ◽  
Simulation Results ◽  
Good Agreement

In this paper, a new design of inclined solar still with steppe absorber plate, slope surfaces and baffles were proposed, fabricated, tested and modeled using ANSYS FLUENT software, in order to develop the simple and the cheapest type of desalination. The simulation has been carried out and validated with experimental data for climate conditions of Rabat-Morocco (34°47’N) obtained from our existing prototype. It has been found that the simulation results are in good agreement with the experimental data. It was also examined that the productivity of the cascade Solar Still was higher from 12:00 to 15:00 hrs. The results indicate that the new design ensures higher productivity.

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