نتایج جستجو برای ' Simulation '

Simulation of Shahr-e Rey subway station as power-plant station to back-up subway in critical situations Since industrial revolution Air pollution and other related major problems in mega cities like Tehran play important role in civil engineering. In the other hand limitations such as timeworn urban textures challenge all governments to find certain solution for similar places. On the other hand, we faced lack of energy resource in Mega cities like Tehran also these cities don’t have en...

Simulation–based multi-criteria optimization of the building energy consumption using NSGA-II Iran is one of the largest energy consuming countries in the world. In Iran, buildings account for a significant proportion of the total energy consumption and carbon dioxide emission in which the energy used for the annual cooling, heating and lighting comprises up to 40%. This paper proposes a new approach for the simulation–based multi-criteria optimization problems, which overcomes im...

Simulation study of natural ventilation on energy efficiency and reduction of Co2 emission in a humid climate Nowadays, researchers have conducted many studies about the role of natural ventilation as a passive cooling system. This would also help in reducing costs, excessive use of energy and the consequential environmental effects of year-round air conditioning. In this regard, energy consumption and Co2 emissions associated with buildings has a significant impact on the environment. The cur...

Multi–criteria optimization of the building energy efficiency: A simulation–based genetic algorithm Iran is one of the largest energy consuming countries in the world. In Iran, buildings account for a significant proportion of the total energy consumption and carbon dioxide emission in which the energy used for the annual cooling, heating and lighting comprises up to 40%. This paper proposes a new approach for the simulation–based multi– criteria optimization problems, w...

Application of Surrogate Safety Measures for Safe Signal Timing in Urban Intersections Safe Signal timing at urban intersections as bottlenecks of road facilities can be achieved through investigation of traffic conflicts. Traffic conflicts are among safety indices which have the ability to proactively predict safety conditions of a site without any crash occurrence. Attempt is made here to develop models in order to design a safe signal timing for an isolated intersection in Isfahan, Iran, usi...

Numerical simulation of pull-out test and bi-axial polymer geogrids behavior in sandy soil Finite element method based three-dimensional numerical simulation was used to study the behavior of bi-axial polymer geogrid buried in sandy soil. Thus, the ABAQUS software was used, which is one of the commercial software that solves equations through finite element method. After verifying the accuracy of numerical simulation with experimental results, the effect of mechanical characteristics on pull-o...

Investigation of laminar flow and vortex shedding around two aerodynamic shapes predicted by CFD In this research, the simulation of air cross flow past the cylinders wall was accomplished based on the finite volume method and also a twodimensional large eddy simulation is performed with no-slip boundary conditions at the solid walls, a section of a cylinder that has a cavity in order to simulation a cross-section of a cylinder. An elliptical cylinder and in another case a circular cylinder wit...

Shahar Chay Dam-Break simulation using OpenFOAM Dams have some potential risks that dam-break is one of them. Dam-break can cause a significant disaster in the downstream. Hence, the main purpose of this paper is to modeling and simulating dam failure, and determination of the hazard regions by flood. In order to simulate the dam-break problem, OpenFOAM software is applied. OpenFOAM is a framework for developing application executables that use packaged functionality contained within a collecti...

Application of subset simulation approach for reliability analysis of structural systems Estimation of failure probability in structural systems is a challenging problem in reliability analysis of structures. For problems with small failure probability or high dimensions, common methods such as Monte Carlo simulation (MCS) method cannot be useful; in these cases, a simulation method which is so called ‘Subset Simulation’ approach can be the best offer. The most common algorithm in t...

3D Numerical simulation of adit excavation influence on the main tunnel This paper investigates an adit excavation influence on the development of the strain at the main tunnel by 3D numerical simulation. For this purpose, a parametric study was conducted through categorizing different rocks and tunnel depths into five squeezing potential groups, and considering four adit intersection angles. According to the results, a formulation is introduced to predict the maximum extra strain of the main t...