In this study the numerical simulation of three dimensional turbulent impinging round jets are co... more In this study the numerical simulation of three dimensional turbulent impinging round jets are conducted using the CFD method. The two jets one impinging on a simple flat plate and the other impinging on a circular pedestal heated and mounted on a flat plate are investigated. The flow fields and heat transfer characteristics of the two cases are compared at a Reynolds number of 23000 and nozzle to target distance of six times the diameter of the jet. The purpose of this paper is studying the effect of existence of the pedestal on rate of heat transfer. Turbulent fluctuations in the velocity field are modeled using the Reynolds Averaged Navier-Stokes (RANS) methodology. Turbulence is assumed to be isotropic. The buoyancy and radiation heat transfer effects are neglected and the flow is considered to be incompressible. The simulations are performed using various turbulence models such as the Realizable k , k RNG , k SST and f 2 . There is a good agreement between the c...
In this paper the three dimensional round jet impinging on a circular pedestal is simulated. The ... more In this paper the three dimensional round jet impinging on a circular pedestal is simulated. The predictions are carried out through numerical procedure based on finite volume method. The effects of the nozzle to target spacing (H/D=2, 4 and 6) and Reynolds numbers (23000 and 50000) are investigated. The flow field is considered to be incompressible and the buoyancy and radiation heat transfer effects are neglected. Turbulent fluctuations in the velocity field are modeled using the Reynolds Averaged Navier-Stokes (RANS) methodology and various turbulence models such as SST k , RNG k , Realizable k and 2 f are also used. The results of convective heat transfer obtained on the pedestal and the flat plate, using 2 f turbulence model have good agreement with the experimental data compared to the other models and also heat transfer increases with increasing Reynolds number and the maximum heat transfer coefficients occur for H/d equals to six.
ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 3, 2010
Abstract In this paper, the effects of various geometric parameters of a high pressure swirl Gaso... more Abstract In this paper, the effects of various geometric parameters of a high pressure swirl Gasoline Direct Injector (GDI) on the injection flow quality are investigated. The two-dimensional axisymmetric Navier-Stokes equations coupled with the Volumeof-Fluid (VOF ...
In this paper, a two-dimensional numerical model is developed to study liquid sloshing in contain... more In this paper, a two-dimensional numerical model is developed to study liquid sloshing in containers considering liquid free surface deformation, liquid viscosity and surface tension. The model is validated by a comparison between the computational and theoretical/experimental results for various sloshing scenarios with different time-dependent linear/angular accelerations. The governing equations for the 2D incompressible fluid flow are continuity and Navier–Stokes equations along with an equation for the free surface advection. The deformation of the liquid–gas interface is modeled using the volume-of-fluid (VOF) method. The fluid flow equations describing the fluid sloshing in the container and the dynamic equation which describes the movement of the container are solved separately in two coupled programs. In each time step of computations, the outputs of the fluid program (forces and torque) are obtained and used as inputs for the dynamic program. The forces and torque are applied to the body of the container resulting in translational and rotational accelerations which are then used as inputs to the fluid program in the next time step. The model is also used to simulate the movement of a liquid container in a general case where a complete interaction between the liquid and solid body of the container exists and the container has both linear and rotational accelerations.
In this study the numerical simulation of three dimensional turbulent impinging round jets are co... more In this study the numerical simulation of three dimensional turbulent impinging round jets are conducted using the CFD method. The two jets one impinging on a simple flat plate and the other impinging on a circular pedestal heated and mounted on a flat plate are investigated. The flow fields and heat transfer characteristics of the two cases are compared at a Reynolds number of 23000 and nozzle to target distance of six times the diameter of the jet. The purpose of this paper is studying the effect of existence of the pedestal on rate of heat transfer. Turbulent fluctuations in the velocity field are modeled using the Reynolds Averaged Navier-Stokes (RANS) methodology. Turbulence is assumed to be isotropic. The buoyancy and radiation heat transfer effects are neglected and the flow is considered to be incompressible. The simulations are performed using various turbulence models such as the Realizable k , k RNG , k SST and f 2 . There is a good agreement between the c...
In this paper the three dimensional round jet impinging on a circular pedestal is simulated. The ... more In this paper the three dimensional round jet impinging on a circular pedestal is simulated. The predictions are carried out through numerical procedure based on finite volume method. The effects of the nozzle to target spacing (H/D=2, 4 and 6) and Reynolds numbers (23000 and 50000) are investigated. The flow field is considered to be incompressible and the buoyancy and radiation heat transfer effects are neglected. Turbulent fluctuations in the velocity field are modeled using the Reynolds Averaged Navier-Stokes (RANS) methodology and various turbulence models such as SST k , RNG k , Realizable k and 2 f are also used. The results of convective heat transfer obtained on the pedestal and the flat plate, using 2 f turbulence model have good agreement with the experimental data compared to the other models and also heat transfer increases with increasing Reynolds number and the maximum heat transfer coefficients occur for H/d equals to six.
ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 3, 2010
Abstract In this paper, the effects of various geometric parameters of a high pressure swirl Gaso... more Abstract In this paper, the effects of various geometric parameters of a high pressure swirl Gasoline Direct Injector (GDI) on the injection flow quality are investigated. The two-dimensional axisymmetric Navier-Stokes equations coupled with the Volumeof-Fluid (VOF ...
In this paper, a two-dimensional numerical model is developed to study liquid sloshing in contain... more In this paper, a two-dimensional numerical model is developed to study liquid sloshing in containers considering liquid free surface deformation, liquid viscosity and surface tension. The model is validated by a comparison between the computational and theoretical/experimental results for various sloshing scenarios with different time-dependent linear/angular accelerations. The governing equations for the 2D incompressible fluid flow are continuity and Navier–Stokes equations along with an equation for the free surface advection. The deformation of the liquid–gas interface is modeled using the volume-of-fluid (VOF) method. The fluid flow equations describing the fluid sloshing in the container and the dynamic equation which describes the movement of the container are solved separately in two coupled programs. In each time step of computations, the outputs of the fluid program (forces and torque) are obtained and used as inputs for the dynamic program. The forces and torque are applied to the body of the container resulting in translational and rotational accelerations which are then used as inputs to the fluid program in the next time step. The model is also used to simulate the movement of a liquid container in a general case where a complete interaction between the liquid and solid body of the container exists and the container has both linear and rotational accelerations.
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Papers by Rasool Elahi