Showing 7 results for Shateri
Volume 6, Issue 22 (10-2018)
Abstract
The tales reflect the thinking, lifestyle and beliefs of people over time. Despite the obvious differences of stories with each other in different cultures and clans, there are also common features. . Stories have been used as a part of folk art and literature from myths. A group of thinkers like Freud believe that myths have influenced folk oral stories. But another group, including Andrew Lang, disagrees with this category the story is not a myth left and, in fact, these are myths formed on the basis of folk oral stories. In each society, there are some ancient behavioral patterns which may not necessarily be taught only indirectly to people in the community. or, vice versa, may be attributed to some of those patterns in the formal education system. All those ancient practices today are part of a culture that has been inherited from one generation to another. This article will be followed by a review of the category of "hair" in folk oral stories it is even possible to try to find their mythological expressions. The result of this research, which collects data in a library-based way based on descriptive-analytic research methodology, shows that hair is a sign of femininity and female sexual power. The female personality of stories has mostly fertility, water-relatedness and vegetative fertility women. There are also many ways of life, and especially marriage, in these stories, rituals, and rituals of the maternal age
Ehsan Heidari, Alireza Shateri Najaf Abadi,
Volume 15, Issue 9 (11-2015)
Abstract
In this study, the numerical investigation of transient natural convection with respect to the effects of two-way fluid-structure interaction, is presented in a square enclosure containing a flexible baffle. The enclosure is filled with air of Prandtl number 0.71. Temperature is constant in both hot and cold vertical walls, while baffle and horizontal walls are adiabatic. Arbitrary Lagrangian-Eulerian (ALE) formulation is used to describe the fluid motion in the given model. Non-Dimensional fluid domain equations with relevant boundary conditions are discretized by the finite volume method (FVM), and PISO algorithm is used to solve the pressure-velocity coupling. Non-Dimensional equations of the baffle motion are solved by the finite element method (FEM) and Newton-Raphson iteration technique. Rayleigh number changes over the range of 10^3 to 10^6. Among the assessed cases in this study, 25 and 35 percentages of them indicate respectively, increase and decrease in the rate of heat transfer in compare with the enclosure containing a rigid baffle. Maximum and minimum values of Num,ss variation are respectively, 4.5 and -15.4 percent. In compare with the rigid baffle, about 90 percent of assessed cases indicate an increase in the time to reach the steady state situations, that it is not considered favorable.
Fatemeh Karami, Afshin Ahmadi Nadooshan, Alireza Shateri,
Volume 17, Issue 2 (3-2017)
Abstract
A lot of research has been done to study force-tractions and couple-tractions acting on the surface of solid and fluid elements. Navior-Stokes equations have been developed based on these researches in the domain of fluid mechanics. However, a number of researchers have emphasized that the Navior-Stokes equations are not sufficient and they should be modified because regardless of couple-stress effects. In this paper, after presenting couple-stress theory, two flow geometry between two concentric pipes and flow over porous wall are considered and the behavior of them are compared with classical case. It has been shown that the force-stress tensor is not symmetric by calculating two components of the force-stress tensor for flow between two concentric pipes. In addition, it can be considered that length scale is an effective parameter on small scale flow by calculating flow velocity profile for these two geometries and by comparing them with classical solution. However, the effects of length scale on the velocity profile and the flow rate decrease with increasing geometrical scales of the problem. These results can be used to study fluid flows with small-scale characteristics such as biofluids, lubrication and microelectromechanical systems
Mohammad Javad Khayyami, Alireza Shateri Najaf Abadi, Mohammadmahdi Doustdar,
Volume 18, Issue 7 (11-2018)
Abstract
The purpose of this study is to investigate the effect of the simultaneous use of fuel injection injectors in an air cross flow. Nowadays, several methods are proposed for optimizing fuel injection in internal combustion engines. These optimizations are due to the high impact of this variable on engine performance and reduction of emissions. The method proposed in this study is to use two fuel injectors instead of a single injector in the air inlet manifold. The uses of two injectors in order to impingement two fuel sprays and increase the turbulent and collision of droplets, and so break them up faster. Also, the use of two injectors can provide more control over spatial and temporal distribution. Simulations are performed numerically using the generalized Kiva code. These simulations are similar to the fuel injection conditions in the manifold of the spark ignition internal combustion engine. The results indicate that the placement of two injectors in a longitudinal distance, the installation of two injectors at a 70 ° angle with the duct, placing two injectors in 180° or 90° relative angles and a 15° conical angle reduces the average diameter of the droplets. The results of this study can be used to design an internal combustion engine fuel injection system.
M. Rezaee , V. Shaterian_alghalandis,
Volume 19, Issue 9 (September 2019)
Abstract
The equations of nonlinear motion of clamped-hinged beam with an open crack were extracted and through solving them, the internal resonance in the cracked beam was studied. To this end, the crack was modeled as a torsional spring and the cracked beam was considered as two beam segments connected by a torsional spring. The equations of motion of the cracked beam were extracted considering the geometrical nonlinearity. Then, using the Galerkin’s method, these equations were changed to a set of nonlinear differential equations for vibration modes which were solved by the perturbation method. Since the mechanical energy of the beam in each mode depends on the instantaneous amplitude of vibration of the beam at the corresponding mode, so to analyze the influence of the crack on the energy exchange between the modes, the instantaneous amplitudes of the vibration modes were obtained. The results show that in the cracked beam the magnitude of the energy exchanged between the modes is less and the frequency is more than that in the intact beam. Also, by increasing the crack depth the frequency of energy exchange between the modes increases. The Vibration response obtained for the cracked beam with various amounts of the damping ratios shows that the frequency and the amplitude of energy exchange between the modes are independent of the system damping. To validate the results by the perturbation method, the equations of motions are also solved by a numerical method and the obtained results are in agreement with the results of the analytical method.
Shokrallah Mohammmad Beigi, Alireza Shateri, Mojtaba Dehghan Manshadi,
Volume 21, Issue 4 (April 2021)
Abstract
In the present study, the wake flow field of a submarine model was investigated experimentally in a wind tunnel. The experiments were conducted to determine the effect of the location of control surfaces on the wake inflow to the impeller of the submarine. In order to investigate the effect of the location of control surfaces as the most important innovation of the present study, the aforementioned surfaces were installed in three longitudinal positions X/L=0.89, 0.92, 0.95 on the heel of the submarine model, and the wake flow was measured at position X/L=1.7 and the Reynolds number 6*10^5 by a five-hole probe and a hotwire anemometer. Finally, the longitudinal position X/L=0.95 was selected as the optimal location for the stern planes to improve the wake inflow to the impeller in terms of reducing its total area and the least amount of turbulence and non-uniformity. The results obtained during this study showed that arriving of the holder basechr('39')s wake to the stern area increases the area and average velocity and subsequently reducing the non-uniformity of the wake flow.
Volume 26, Issue 3 (Fall 2022)
Abstract
The need to be aware of the economic value of places of historical and touristic importance and the factors affecting creating employment, production, regional income, and public investment and appropriate policies for improving qualities, are not hidden from anyone and of course, have great importance. As one of the most important and well-known historical monuments of Chaharmahal and Bakhtiari province, Chaleshtor Castle is an important destination for tourists every year. The aim of the current research is to answer: How much is the annual economic value of Chaleshtor Castle? So, to respond to the same, the individual cost method has been used. The statistical population includes all the visitors to Chaleshtor Castle. The data were gathered and analyzed using Cochran's formula and random sampling where 130 people were questioned by a prepared questionnaire in the summer of 2022. In this research, the travel cost generation was estimated based on the linear form and using the ordinary least square (OLS) regression method. Based on the results, the travel cost variables and the type of vehicle to reach the destination were found to be the important factors affecting the number of annual visits. In this way, each of these variables will lead to a decrease in the number of visits with a coefficient of -0.0002 and -0.287 respectively. The average value of household entertainment for visiting Chaleshtor Castle using the travel cost method is estimated at 295,260 Rials per year and the total amount of consumer surplus per year is estimated at 230,252,925 Rials. The findings of the research can be a guide for the planners of the cultural heritage organization to determine the appropriate ticket price and provide services. Therefore, suggestions have been made to increase the attractiveness to this area by creating cultural centers such as libraries, handicraft centers, resting places such as restaurants, cafes, play centers for children, etc.
