Fa
  • Ph.D. (1993)

    mechanical engineering

    , McGill,

  • Aerodynamics, Computational Fluid Dynamics
  • Aero-elasticity

    Contact

    Curriculum Vitae (CV)

    Numerical study of effect of the diameter and Number of blades of impeller of down hole submersible oil pump on the pump performance

    M HOSEINIPARAST, S FALLAH, DB GHADIRI
    Journal Paper , , {Pages }

    Abstract

    Numerical investigation of airfoil geometric variations impacts on flow structures in a subsonic fan using Large Eddy Simulation method

    Mahmood Asgari Savadjani, Behzad Ghadiri
    Journal PaperModares Mechanical Engineering , Volume 18 , Issue 3, 2018 May 10, {Pages 153-163 }

    Abstract

    The numerical simulation of near-stall condition in a passage of an isolated subsonic rotor is studied in detail. The requirements of numerical simulation in order to resolve turbulent spectra around the blade are studied. According to the fact that most of unsteady aerodynamic phenomena incept from blades leading edge, and the role of this part in types and intensity of instabilities, the goal of this paper is to investigate the effects of changes in radius of leading edge of airfoil on flow phenomena in different scales of wave numbers. The governing equations of flow-field are solved using different numerical approaches. Resolution characteristics of different modeling and simulation techniques are investigated. The primary geometry of b

    2D FLAT AND CURVED PLATE FREQUENCY AND AEROELASTIC ANALYSIS WITH IN-PLANE FORCE AND AERODYNAMIC THERMAL LOAD EFFECTS IN FRE...

    H MOOSAZADEH, DEHKORDI B GHADIRI, M RASEKH
    Journal Paper , Volume 13 , Issue 248, 2017 January 1, {Pages 35-47 }

    Abstract

    A homogenous plate with a high length to width ratio (2D model) and simply supported boundary conditions is assumed. The effect of panel curvature is considered and a non-linear deformation via Von Karman’s strains is taken into account. A frequency and flutter analysis of flat and curved plate under in-plane loads and thermal effects for the structure with temperature dependent properties has been performed. The first order piston theory is deployed to model supersonic aerodynamic loading. The system of non-linear PDE equations has been derived using the Hamilton principle and transformed into a set of non-linear ODE equations via the Galerkin method. By transforming the equations into the state space form and defining the proposed Jacob

    مطالعه عددی تاثیر فاصله و زاویه میان هاب و شرود در گذرگاه خروجی ایمپلر یک طبقه از پمپ ESP‎

    حسینی پرست, قدیری, فلاح, صالح‎
    Journal Paper , , {Pages }

    Abstract

    2D FLAT AND CURVED PLATE FREQUENCY AND AEROELASTIC ANALYSIS WITH IN-PLANE FORCE AND AERODYNAMIC THERMAL LOAD EFFECTS IN FREQUENCY DOMAIN

    H MOOSAZADEH, DB GHADIRI, M RASEKH
    Journal Paper , , {Pages }

    Abstract

    Numerical prediction of vibration in flexible tube bundles under two phase cross flow with HEM

    Amid Khosrowdad, Behzad Ghadiri Dehkordi, Mohammad Reza Ansari, Hamed Houri-Jafari
    Journal Paper , Volume 14 , Issue 15, 2015 January 1, {Pages 155-169 }

    Abstract

    Fluid-Elastic Instability is the most important mechanism among the vibration excitations in heat exchanger tube bundles subjected to cross flow. Flows through the heat exchanger are mostly two phase flow like air-water, vapor-water or Freon. Two phase numerical methods are quite complicated because of some parameters like VOF and interaction between two phases. Experimental studies are another problem and costly. Therefore, numerical methods are very important for studying two phase flow. In this article, threshold of vibration has been numerically predicted by simulation of incompressible, viscose, and unsteady cross flow through a tube bundle in normal triangular arrangement. Interactions between the fluid and the structure have been cou

    Numerical investigation of turbulence characteristics of flow in fixed and oscillating transonic fan cascade.

    Saleh Fallah, Behzad Ghadiri Dehkordi, Ghasem Heidarinejad
    Journal PaperModares Mechanical Engineering , Volume 14 , Issue 16, 2015 April 1, {Pages }

    Abstract

    Investigations of the phenomena associated with the Fluid-Structure interaction in transonic turbomachines due to the presence of unstable flow behaviors have doubled in significance. Severe restrictions of the experimental methods have developed researchers approach in this field to Numerical methods. Nevertheless, using simple two-dimensional model to investigate the phenomenon of quality is inevitable because of high computational cost of numerical methods in aerodynamic and aeroelastic simulation of full model of turbomachines. In this paper transonic flow in fixed fan cascade and fan cascade with central blade vibration in Forced harmonic pattern is simulated and variations of turbulence characteristic patterns are studied. In order to

    Aerothermoelasticity of 2D shell with Finite Volume and Gallerkin Method

    Hamid Moosazadeh, Behzad Ghadiri, Masud Rasekh
    Journal PaperModares Mechanical Engineering , Volume 15 , Issue 8, 2015 October 15, {Pages 312-322 }

    Abstract

    The panel flutter is concentrated with aerospace researchers, because of fatigue failure on structures. The usage of the numerical simulation is good company with analytical method. The 2D cylindrical panel flutter is simulated with navierstocks equations for fluid flow with finite volume theory. Also, Simulation is prepared with piston theory for analytical solution. Comparison of full numerical finite volume and assume mode method in post flutter domain is produced. Non-linear shell with the effect of in-plane load, thermal load and aerodynamic load with 3rd order piston theory is modeled to solve with assume mode method. The numerical method is 4th order rung-kutta to solve ODEs. With increasing shell camber, limite cycle oscillation cha

    2D Local Imperfect plate Non-linear Vibration and Aerothermoelastic analysis in Supersonic Flow.

    Hamid Moosazadeh, Behzad Ghadiri Dehkordi, Masoud Rasekh
    Journal PaperModares Mechanical Engineering , Volume 15 , Issue 3, 2015 May 1, {Pages }

    Abstract

    A homogenous 2D plate with simply supported boundary conditions and local imperfection is assumed. The effect of nonlinear deformation with Reddy and marguerre plate model has been introduced. The effect of local imperfection in non-linear vibration analysis with the effect of thermal and in-plane load has been investigated for the first time. The plate softening and hardening type with the effect of imperfection size is investigated. Flutter boundary of local imperfect plate with the effect of supersonic aerodynamic, thermal and mechanical load has been studied for the first time. First and third order piston theory aerodynamic (PTA) is employed to model supersonic aerodynamic loading. Equations of motion have been derived by use of Hamilt

    2D CURVED PLATE NON-LINEAR VIBRATION AND AEROELASTIC ANALYSIS WITH INPLANE AND SUPERSONIC AERODYNAMIC LOAD IN TIME DOMAIN

    HAMID MOOSAZADEH, DEHKORDI BEHZAD GHADIRI, MASOUD RASEKH
    Journal Paper , Volume 14 , Issue 15, 2015 January 1, {Pages 405-413 }

    Abstract

    A homogenous 2D plate with simply support boundary conditions is assumed. The effect of plate curvature and nonlinear deformation effects with cylindrical shell model and von Karman’s relation, has been introduced. Linear and Non-linear Frequency analysis with the effect of curvature and in-plane load has been investigated for the first time. Curved plate panel flutter, with the effect of supersonic aerodynamic and in-plane load has been studied for the first time. First and third order piston theory aerodynamic (PTA) is employed to model supersonic aerodynamic loading. Equations of motion have been derived by the use of Hamilton’s principle and resultant nonlinear PDEs have been transformed into nonlinear ODEs via Galerkin’s method.

    Variable Thickness Supersonic Airfoil Post flutter with plunging and pitching free play and Non-linear Damping and Stiffness.

    Hamid Moosazadeh, Behzad Ghadiri Dehkordi, Puria Zarifian
    Journal PaperModares Mechanical Engineering , Volume 15 , Issue 6, 2015 August 1, {Pages }

    Abstract

    The application of wing and stabilizer in aerospace vehicle is vitaly important to stability and flight motion. In this study nonlinear 2D wind is estimated. Nonlinear damping and stiffness with freeplay in plunging and pitching motion is assumed. 2nd order Damping nonlinearity and 3rd order stiffness nonlinearity in pitching and plunging motion is assumed. Fully nonlinear structure with nonlinear 3rd order piston theory aerodynamic is assumed for the first time and result evaluated with different references. The equations are defined with Hamilton principle with the use of kinetic and potential energy and virtual work. They are solved in the state space via the ruge-kuta numerical method to determine chaotic and limit cycle oscillation mot

    Numerical investigation of turbulence characteristics of flow in fixed and oscillating transonic fan cascade

    S Fallah, B Ghadiri, G Heidarinejad
    Journal Paper , , {Pages }

    Abstract

    Numerical Simulation of Two-dimensional Incompressible Flow in Turbomachinary Cascades With Detached Eddy Simulation

    Mehrdad Yari Sakene
    Journal PaperModares Mechanical Engineering , Volume 13 , Issue 13, 2014 February 15, {Pages 121-131 }

    Abstract

    The aim of this research is to study effective parameters of incompressible, viscous and unsteady flow in Turbomachinary cascades using the Spalart-Allmaras (SA) RANS-Based Delayed Detached Eddy Simulation method. Detached Eddy Simulation is a hybrid RANS-LES method that was purposed in order to reduce LES computational cost. In this method, near wall, in boundary layer, RANS turbulence model is used and away from the wall, method automatically switches to LES. To develop original DES method (DES97), DDES was purposed to solve modeled stress depletion problem. A new function is introduced to the DDES model to make the transition from RANS to LES grid cell size independent. The numerical method that is used for discretization is staggered fi

    Investigation of harmonic instability of laminar fluid flow past 2D rectangular cross sections with 0.5–4 aspect ratios

    Behzad Ghadiri Dehkordi, Saleh Fallah, Amirreza Niazmand
    Journal PaperProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science , Volume 228 , Issue 5, 2014 April , {Pages 828-839 }

    Abstract

    The viscous, incompressible and laminar flow around rectangular cross sections is simulated via a Cartesian-Staggered grid finite volume method for various of aspect ratios. Simulations were carried out for a range of 10–150 Reynolds number and aspect ratios of 0.5–4. In the present work, The Great-Source Technique is used to satisfy directly the no slip condition. The grid is refined in the same size in the back and front regions of the body, but for increasing computation accuracy, the region of rectangular section has been refined more. Because of widespread application of rectangular cross sections and less attendance on it than circular sections, especially in laminar flow and low Reynolds, the aim of this study is to investigate t

    Development of a PISO-SPH method for computing incompressible flows

    Ali Tayebi, Behzad Ghadiri Dehkordi
    Journal PaperProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science , Volume 228 , Issue 3, 2014 February , {Pages 481-490 }

    Abstract

    A new algorithm is proposed for solving the time-dependent Navier-Stokes equations in a sequential uncoupled manner. The algorithm, known as PISO (Pressure Implicit with Splitting of Operators) is extended to the Smoothed Particle Hydrodynamics (SPH) context (PISO-SPH). The algorithm consists of one prediction and two correction steps, based on a full Navier-Stokes equation, therefore, a modified Poisson equation is derived which makes the algorithm more stable with less pressure fluctuations. The proposed PISO-SPH method is applied to solve a number of benchmark problems including both unsteady and steady state test cases. Comparing the results with analytical solutions and other numerical methods, it is shown that the proposed method is a

    Control of pressure fluctuations in SPH method for simulation of flow past a cylinder

    Ali Tayebi, Behzad Ghadiri, Mehrdad Manzari
    Journal PaperModares Mechanical Engineering , Volume 13 , Issue 7, 2013 October 15, {Pages 32-44 }

    Abstract

    Smoothed particle hydrodynamics (SPH) is a fully Lagrangian particle method which solves a problem without using any mesh or grid. Pressure fluctuation is one of the main drawbacks of the weakly compressible SPH (WCSPH) method that leads to an inaccurate pressure distribution. In the present work, a diffusive term is added to the continuity equation to suppress the density and consequently pressure fluctuations. In contrast to the mesh-based methods, flow separation and inflow/outflow boundary conditions are two challenging issues in the SPH method. To overcome these problems, a new algorithm for inflow/outflow boundary condition as well as a particle shifting method is utilized for simulation of flow past a cylinder. Comparing the results

    Vibration Analysis of Free-Free Multi Step Timoshenko Beam under Follower Force Effect with Joint Springs and Concentrated and Distributed Mass Effects

    H Moosazadeh, A Esbati, B Ghadiri Dehkordi, S Irani
    Journal PaperAerospace Mechanics Journal , Volume 9 , Issue 2, 2013 July 15, {Pages 24-Nov }

    Abstract

    This paper presents the variation in dynamic and static instability characteristics of free-free Timoshenko beam subjected to follower force, where each step has a point mass with transverse and rotary inertia. A finite element code is developed to model two-dimensional Timoshenko beams using the extended Hamilton's principle. The effects of each section length and distributed and concentrated mass on the type of the instability and the critical follower force have been studied for different models of beams. It is concluded that when mass of last section is subsided, the magnitude and the type of instability changes significantly and in most cases it decrease. It is observed that change in rotary inertia parameter of Timoshenko beam and the

    Numerical prediction of fluid-elastic instability in normal triangular tube bundles with multiple flexible circular cylinders

    Hamed Houri Jafari, Behzad Ghadiri Dehkordi
    Journal PaperJournal of Fluids Engineering , Volume 135 , Issue 3, 2013 March 1, {Pages 031102 }

    Abstract

    Prediction of fluid-elastic instability onset is a great matter of importance in designing cross-flow heat exchangers from the perspective of vibration. In the present paper, the threshold of fluid-elastic instability has been numerically predicted by the simulation of incompressible, unsteady, and turbulent cross flow through a tube bundle in a normal triangular arrangement. In the tube bundle under study, there were single or multiple flexible cylinders surrounded by rigid tubes. A finite volume solver based on a Cartesian-staggered grid was implemented. In addition, the ghost-cell method in conjunction with the great-source-term technique was employed in order to directly enforce the no-slip condition on the cylinders' boundaries. Intera

    Numerical Prediction of Fluid-Elastic Instability in a Normal Triangular Tube Bundle

    H Houri Jafari, B Ghadiri Dehkordi
    Journal PaperJournal of Material Eng , Volume 1 , Issue 2, 2013 January , {Pages Sep-35 }

    Turbulent free surface flow over semicircular and circular obstacle in a duct/Laisvas turbulentinis pavirsinis tekejimas vamzdyje apie pusapvale ir apvalia kliuti

    B Ghadiri Dehkordi, A Mehrabadi
    Journal PaperMechanika , Volume 18 , Issue 5, 2012 September 1, {Pages 539-546 }

    Abstract

    In this paper 2D flow field and free surface analysis around semicircular and circular obstructions in a duct is numerically studied. The governing equations are numerically solved in the domain by the control volume approach based on the SIMPLE technique. Validation of present simulation was performed with several test cases and comparisons show the good agreement with the literature. Final profile of free surface in the vicinity of obstruction is comprised with the profile in a duct without any obstructions. Present results show, as the obstacle size grows, the level of the free surface at the upstream grows and the height of the free surface at the downstream decreases.

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