A Review of Recent Studies on Simulations for Flow around High-Speed Trains

Fluid flow around bluff bodies occurs in numerous fields of science and engineering. For example, flows pass vehicles, cables, towers, bridges etc. These flows have been studied experimentally and numerically for the last several decades. The investigation of flow over high-speed train is an important application of bluff bodies. Fluid flow, aerodynamic forces and moments, separation and wake region have been studied for the last several decades. This paper brings together the comprehensive review of the research on air flow around the high-speed trains and its impacts.

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

Fluid Flow and Heat Transfer Over Staggered ꞌ+ꞌ Shaped Obstacles

The inclusion of complex obstacles within solar chaels is the aim of our study. Two obstacles of the form ꞌ+ꞌ interlaced within a two-dimensional and rectangular chael are the subject of our study. Fluid is Newtonian, turbulent, non-compressible and has constant properties. The number of Reynolds varies from 12,000 to 32,000 with a constant temperature along the upper surface of the chael. The thermal and dynamic analysis of the chael's inteal structure has been carefully processed. Different fields of speed and heat, with various profiles of frictions and heat exchange coefficients have been included in this research. Future work will involve more complex geometries and using nanofluids to assess the optimum conditions for heat transfer enhancements.

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

Study on Free Vibration and Wave Power Reflection in Functionally Graded Rectangular Plates ...

In this paper, the wave propagation approach is presented to analyze the vibration and wave power reflection in FG rectangular plates based on the first order shear deformation plate theory. The wave

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

Evaluation of Fracture Parameters by Coupling the Edge-Based Smoothed Finite Element Method and ...

This paper presents a technique to evaluate the fracture parameters by combining the edge based smoothed finite element method (ESFEM) and the scaled boundary finite element method (SBFEM). A semi-ana

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

Cyclic and Monotonic Behavior of Strengthened and Unstrengthened Square Reinforced Concrete Columns

The use of composite materials is an effective technique to enhance the capacity of reinforced concrete columns subjected to the seismic loading due to their high tensile strength. In this paper, nume

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

Modelling of Crack Growth Using a New Fracture Criteria Based Peridynamics

Peridynamics (PD) is a nonlocal continuum theory based on integro-differential equations without spatial derivatives. The elongation fracture criterion is implicitly incorporated in the PD theory, and

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

Some New Existence, Uniqueness and Convergence Results for Fractional Volterra-Fredholm ...

This paper demonstrates a study on some significant latest iovations in the approximated techniques to find the approximate solutions of Caputo fractional Volterra-Fredholm integro-differential equations. To this aim, the study uses the modified Adomian decomposition method (MADM) and the modified variational iteration method (MVIM). A wider applicability of these techniques are based on their reliability and reduction in the size of the computational work. This study provides an analytical approximate to determine the behavior of the solution. It proves the existence and uniqueness results and convergence of the solution. In addition, it brings an example to examine the validity and applicability of the proposed techniques.

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

Free Vibration Analysis of Quintic Nonlinear Beams using Equivalent Linearization Method with a ...

In this paper, the equivalent linearization method with a weighted averaging proposed by Anh (2015) is applied to analyze the transverse vibration of quintic nonlinear Euler-Beoulli beams subjected to axial loads. The proposed method does not require small parameter in the equation which is difficult to be found for nonlinear problems. The approximate solutions are harmonic oscillations, which are compared with the previous analytical solutions and the exact solutions. Comparisons show the accuracy of the present solutions. The impact of nonlinear terms on the dynamical behavior of beams and the effect of the initial amplitude on frequencies of beams are investigated. Furthermore, the effect of the axial force and the length of beams on frequencies are studied.

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

A Comparative Analysis of TLCD-Equipped Shear Buildings under Dynamic Loads

This study targets the behavior of shear buildings equipped with tuned liquid column dampers (TLCD) which attenuate dynamic load-induced vibrations. TLCDs are a passive damping system used in tall buildings. This kind of damper has proven to be very efficient, being an excellent alteative to mass dampers. A dynamic analysis of the structure-damper system was made using the software DynaPy, developed in the research process. The software solves the equations of motion through numeric integration using the central differences method. The simulations results obtained with DynaPy showed that the use of TLCD can reduce the dynamic response significantly for both harmonic excitations and random excitations.

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

Free Convection Flow and Heat Transfer of Nanofluids of Different Shapes of Nano-Sized ...

In this paper, free convection flow and heat transfer of nanofluids of differently-shaped nano-sized particles over a vertical plate at very low and high Prandtl numbers are analyzed. The gove

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

Extension Ability of Reduced Order Model of Unsteady Incompressible Flows Using a Combination ...

In this article, an improved reduced order modelling approach, based on the proper orthogonal decomposition (POD) method, is presented. After projecting the goveing equations of flow dynamics along

برچسب: نویسنده: مهندس نقوی تاريخ: سه شنبه 27 آذر 1397 ساعت: 13:58

تحلیل QCD تابع ساختار غیریکتای xF3 در پراکندگی ناکشسان ...

در این مقاله با استفاده از دادههای تجربی گروههای ‏‎ CDHSWوCHORUS‏ ‏CCFR, NuTeV,‎‏ برآنیم تا توابع توزیع ‏ظرفیتی کوارکهای ‏‎ u ‎و ‏d‏ را در طیف گسترده