engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363311320.articleApplied Filtered Density FunctionS .L. Yilmazs.levent.yilmaz@unspecified.net0N. Ansarin.ansari@unspecified.net1P. H. Pisciunerip.h.pisciuneri@unspecified.net2M .B. Nikm.b.nik@unspecified.net3C. C. Otisc.c.otis@unspecified.net4P. Givipgivi@pitt.edu5University of Pittsburgh, Pittsburgh, PA, 15260, USAANSYS Inc., Canonsburg, PA, 15317, USAUniversity of Pittsburgh, Pittsburgh, PA, 15260, USAUniversity of Pittsburgh, Pittsburgh, PA, 15260, USAUniversity of Pittsburgh, Pittsburgh, PA, 15260, USAUniversity of Pittsburgh, Pittsburgh, PA, 15260, USAAn overview is presented of recent advances in the filtered density function (FDF) modeling and simulation of turbulent
combustion. The review is focused on the developments that have facilitated the FDF to be broadly applied in large
eddy simulation (LES) of practical flows. These are primarily the development of a new Lagrangian Monte Carlo
solver for the FDF, and the implementation of this solver on Eulerian domains portrayed by unstructured grids. With
these developments, it is now much easier to apply FDF for predictions of reacting flows in complex geometrical
configurations.
http://jafmonline.net/JournalArchive/download?file_ID=30180&issue_ID=214Turbulence combustion large eddy simulation filtered density functionengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363321329.articleFinite Element Analysis of Radiation and Mass Transfer Flow Past Semi- Infinite Moving Vertical Plate with Viscous DissipationV. S. Raouhita@yahoo.com0L. A. Babul.anand.babu@unspecified.net1R. S. Rajuraju@jafmonline.net2Department of Mathematics, Anurag group of Institutions, Hyderabad-500088, India.Department of Mathematics, Anurag group of Institutions, Hyderabad-500088, India.Department of Mathematics, B.V.R.I.T, Narsapur-502313, India.The objectives of the present study are to investigate the radiation effects on unsteady heat and mass transfer flow of
a chemically reacting fluid past a semi-infinite vertical plate with viscous dissipation. The method of solution is
applied using Finite element technique. Numerical results for the velocity, the temperature and the concentration are
shown graphically for various flow parameters. The expressions for the skin-frication, Nusselt number and Sherwood
number are obtained. The result shows that increased cooling (Gr>0) of the plate and the Eckert number leads to a
rise in the velocity. Also, an increase in the Eckert number leads to an increase in the temperature, whereas increase
in radiation lead to a decrease in the temperature distribution when the plate is being cooled.http://jafmonline.net/JournalArchive/download?file_ID=30099&issue_ID=214Transfer Viscous dissipation Radiation Chemical reaction Finite element technique.engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363331338.articlePulsatile MHD Arterial Blood Flow in the Presence of Double StenosesM. K. Sharmadrms123@gmail.com0P. R. Sharmaprofprsharma@yahoo.com1V. Nashavinay.nasha@unspecified.net2Department of Mathematics, Guru Jambheshwar University of Science & Technology, Hisar (Haryana) 125001 IndiaDepartment of Mathematics, University of Rajasthan, Jaipur (Rajasthan) 302004 , India Department of Mathematics, Guru Jambheshwar University of Science & Technology, Hisar (Haryana) 125001 IndiaThe hemodynamics provides a way to predict effect of atherosclerosis by means of mathematical models. The
pulsatile flow of blood through an artery with two side-to-side axisymmetric stenoses has been considered. A static
transverse magnetic field to the flow is taken into account. The velocity profile, Wall Shear Stress and Wall Shear
Stress Gradient to the flow have been simulated under the influence of magnetic field for various values of length and
thickness of the stenosis. The upstream flow velocity in the subsequent stenosis region is significantly lower down
from the velocity in the preceding stenosis region. The flow velocity decreases with the increase of Hartmann
number. In the stenosis region wall shear stress (WSS) increases from unstenosed region to maximum thickness of
stenosis. The wall shear stress (WSS) increases with the increase of Hartmann number and Womersley number. The
WSSG have local maximum value in the vicinity of the throat of the stenoses and oscillates in the stenosed portion of
the artery. The magnitude of WSSG is directly proportional to the Hartmann number. WSSG increases in magnitude
on the upstream and downstream section of both the stenoses with the increase of Womersley number. Generated
data are analyzed and discussed through graphs.http://jafmonline.net/JournalArchive/download?file_ID=30100&issue_ID=214Stenosed artery Unsteady flow Newtonian incompressible fluid Hartmann number Wall shear stress Wall shear stress gradient.engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363339350.articleAn Explicit Model for Concentration Distribution using Biquadratic-Log-Wake Law in an Open Channel FlowS. Kundusnehasis.kundu@uspecifed.net0K. Ghoshalkoeli@maths.iitkgp.ernet.in1Department of Mathematics, Indian Institute of Technology, Kharagpur, 721302, IndiaDepartment of Mathematics, Indian Institute of Technology, Kharagpur, 721302, IndiaThe log-wake law with biquadratic boundary correction for the vertical velocity distribution which was changed from
cubic boundary correction by Guo for the pipe data is applied to turbulent flow in open-channels. The biquadraticlog-
wake law is tested with experimental data from Coleman, Lyn, Wang and Qian and Kironoto and Graf. It shows
that the biquadratic-log-wake law matches well with flume data. A new mathematical model for vertical
concentration distribution using the biquadratic-log-wake law is proposed and tested with the existing laboratory data.
This study reflect the fact that sediment suspension has significant effects on both von Karman constant and Coles’
wake strength.http://jafmonline.net/JournalArchive/download?file_ID=30101&issue_ID=214Open-channel Velocity distribution Boundary correction Sediment suspension von Karman constant Coles’ wake strength.engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363351356.articleThe Combined Effect of Chemical Reaction, Radiation on Heat and Mass Transfer along a Continuously Moving Surface in Presence of ThermophoresisB. Chandrabhaskerchandra6@gmail.com0M. Kumarmnj_kumar2004@yahoo.com1Department of Mathematics, Statistics and Computer Science College of Basic Sciences & Humanities G. B. Pant University of Agriculture & Technology Pantnagar -263145, Uttarakhand IndiaDepartment of Mathematics, Statistics and Computer Science College of Basic Sciences & Humanities G. B. Pant University of Agriculture & Technology Pantnagar -263145, Uttarakhand IndiaThe effect of chemical reaction, radiation on heat and mass transfer along a continuously moving surface in presence
of thermophoresis has been discussed. The fluid viscosity is assumed as an inverse linear function of temperature.
The system of non-linear partial differential equations developed in the process have finally transformed into a set of
ordinary differential equations with the help of similarity transformation and then solved numerically using Runga-
Kutta method with shooting technique. The results showing the effect of physical parameters on velocity, temperature
and concentration have been computed and presented graphically to discuss them in detail. It has been observed that
temperature increases with an increase in radiation parameter. Also, it is seen that the concentration decreases with
the increase in chemical reaction parameter and Schmidt number.
http://jafmonline.net/JournalArchive/download?file_ID=30102&issue_ID=214Chemical reaction Continuously moving surface Heat & mass transfer Thermophoresis Radiation.engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363357367.articleNumerical Solutions of Unsteady Laminar Free Convection from a Vertical Cone with Non-Uniform Surface Heat FluxB. Pullepubapujip@yahoo.com0A. J. Chamkhaachamkha@yahoo.com1Department of Mathematics, S R M University, Kattankulathur, TN, India-603203.Manufacturing Engineering Department, The Public Authority for Applied Education & Training, Shuweikh, 70654 Kuwait Numerical solutions of, unsteady laminar free convection from an incompressible viscous fluid past a vertical cone
with non-uniform surface heat flux m
w
q x a x varying as a power function of the distance from the apex of the
cone ( x 0 ) is presented. Here m is the exponent in power law variation of the surface heat flux. The dimensionless
governing equations of the flow that are unsteady, coupled and non-linear partial differential equations are solved by
an efficient, accurate and unconditionally stable finite difference scheme of Crank-Nicolson type. The velocity and
temperature fields have been studied for various parameters viz. Prandtl number Pr , semi vertical angle and the
exponent m . The local as well as average skin-friction and Nusselt number are also presented and analyzed
graphically. The present results are compared with available results in literature and are found to be in good
agreementhttp://jafmonline.net/JournalArchive/download?file_ID=30103&issue_ID=214Vertical cone Non-uniform surface heat flux Free convectionengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363369373.articleMathematical Modeling of Heat-Transfer for a Moving Sheet in a Moving FluidH. M. Habibhamza.m.habib@unspecified.net0E. R. El-Zaharessam_zahar2006@yahoo.com1Department of Mathematics, Faculty of Science and Humanity Studies, Salman Bin AbdulAziz University, P. O. Box 83, Alkharj11942, KSA.Department of Basic Engineering Science, College of Engineering, Menoufia University, Shebin El-Kom, Egypt.A mathematical model was developed for determining the heat transfer between a moving sheet that passes through a
moving fluid environment to simulate the fabrication process of sheet and fiber-like materials. Similarity
transformations were introduced to reduce the governing equations to two nonlinear ordinary differential equations.
For high values Prandtl number, the energy equation became much stiffer or singularly perturbed and the standard
numerical methods failed to handle it. An innovative procedure combining shooting and singular perturbation
technique was developed. The results show that the heat transfer depends on the relative velocity between the moving
fluid and the moving sheet to a certain value after that value the relative velocity has no effect. If blowing effect is
found the thermal layer becomes thinner and temperature profiles are backed together.http://jafmonline.net/JournalArchive/download?file_ID=30104&issue_ID=214Heat transfer Boundary layer Singular perturbationengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363375384.articleApplication of Density Corrected Spalart-Allmaras Model to Flow Past Ogive Cylinder at High Angles of AttackN. Kumarnaresh@ctfd.cmmacs.ernet.in0M. T. Nairmanojt@ctfd.cmmacs.ernet.in1Computational & Theoretical Fluid Dynamics Division, National Aerospace Laboratories, Council of Scientific &Industrial Research, Bangalore-560017, IndiaComputational & Theoretical Fluid Dynamics Division, National Aerospace Laboratories, Council of Scientific &Industrial Research, Bangalore-560017, IndiaComputation of flow past high speed vehicles requires the use of a reliable turbulence model. Unfortunately, most of
the turbulence models are developed for incompressible flows. Application of these models directly to high speed
boundary layers with large density gradients can lead to significant errors in prediction of skin friction. Several
compressibility corrections have been suggested in literature to predict these turbulent flows at high Mach numbers.
In the present work, we have used two such corrections for the Spalart-Allmaras turbulence model and studied their
performance at high angles-of-attack. Flow past an ogive cylinder is considered for the study.http://jafmonline.net/JournalArchive/download?file_ID=30105&issue_ID=214Spalart-Allmaras Turbulence modeling High angle of attack Compressibility.engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363385395.articleMHD Flow and Heat Transfer in a Power-Law Liquid Film at a Porous Surface in the Presence of Thermal RadiationK. V. Prasadprasadkv2000@yahoo.co.in0K. Vajraveluk.vajravelu@unspecified.net1P. S. Dattip.s.datti@unspecified.net2B. T. Rajub.t.raju@unspecified.net3Department of Mathematics, Central College Campus, Bangalore University, Bangalore 560 001, IndiaDepartment of Mathematics, University of Central Florida, Orlando, FL 32816, USAT.I.F.R. Centre for Applicable Mathematics, Sharada Nagar, Yelahanka New Town, 560 065, Bangalore Department of Mathematics, Central College Campus, Bangalore University, Bangalore 560 001, IndiaIn this paper, the effects of variable thermal conductivity and thermal radiation on the MHD flow and heat transfer of a non-Newtonian power-law liquid film at a horizontal porous sheet in the presence of viscous dissipation is studied. The governing time dependent boundary layer equations are transformed to coupled, non-linear ordinary differential equations with power-law index, unsteady parameter, film thickness, magnetic parameter, injection parameter, variable thermal conductivity parameter, thermal radiation parameter, the Prandtl number and the Eckert number. These coupled non-linear equations are solved numerically by an implicit, finite difference scheme known as the Keller box method. The obtained numerical results for velocity and temperature profiles are presented graphically. Also, the obtained results of our study for some special cases are compared with the previously published results, and the results are found to be in very good agreement. The effects of unsteady parameter on the skin friction, wall- temperature gradient and the film thickness are explored for different values of the power-law index and the magnetic parameter. The results obtained reveal many interesting behaviors that warrant further study of the equations related to non-Newtonian fluid phenomena, especially the shear-thinning phenomena.http://jafmonline.net/JournalArchive/download?file_ID=30108&issue_ID=214MHD flow Power-law fluid Thin liquid film Heat transfer Variable thermal conductivity Viscous dissipation Finite difference method.engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363397404.articleLie Group Analysis of Heat and Mass Transfer Effects on Steady MHD Free Convection Flow past an Inclined Surface with Viscous DissipationM. G. Reddymgrmaths@gmail.com0Department of Mathematics, Acharya Nagarjuna University Ongole Campus, Ongole,A.P. (India) - 523 001This article concerns with a steady two-dimensional flow of an electrically conducting incompressible dissipating fluid over an inclined semi-infinite surface with heat and mass transfer. The flow is permeated by a uniform transverse magnetic field. A scaling group of transformations is applied to the governing equations. The system remains invariant due to some relations among the parameters of the transformations. After finding three absolute invariants, a third-order ordinary differential equation corresponding to the momentum equation, and two secondorder ordinary differential equations corresponding to energy and diffusion equations are derived. The coupled ordinary differential equations along with the boundary conditions are solved numerically. Comparisons with previously published work are performed and the results are found to be in very good agreement. Many results are obtained and a representative set is displayed graphically to illustrate the influence of the various parameters on the dimensionless velocity, temperature and concentration profiles. It is found that the velocity increases with an increase in the thermal and solutal Grashof numbers. The velocity and concentration of the fluid decreases with an increase in the Schmidt number. The results, thus, obtained are presented graphically and discussed.http://jafmonline.net/JournalArchive/download?file_ID=30113&issue_ID=214Lie group analysis Natural convection MHD Viscous dissipation Heat and mass transfer Inclined surfaceengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363405412.articleSimulation of Electrohydrodynamic Jet Flow in Dielectric FluidsH. Sugiyamah.sugiyama@jafmonline.net0H. Ogurah.ogura@jafmonline.net1T. Shiojimatakeo.shiojima@unspecified.net2Y. Otsuboyas.otsubo@faculty.chiba-u.jp3Division of Diversity and Fractal Science, Graduate School of Science and Technology, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba-shi, Chiba, 263-8522 JapanDepartment of Urban Environment Systems, Graduate School of Engineering, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba-shi, 263-8522, JapanDepartment of Urban Environment Systems, Graduate School of Engineering, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba-shi, 263-8522, JapanDepartment of Urban Environment Systems, Graduate School of Engineering, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba-shi, 263-8522, JapanWhen a dielectric fluid is exposed to a high electric field (>1 kVmm-1), electric forces are generated due to the nonuniformity of electric conductivity and dielectric constant. The electric body forces often produce complex and
macroscopic flow such as convection, turbulent and chaotic flow. The secondary flow induced in high electric fields
is well known as electrohydrodynamic (EHD) effects. According to previous EHD experiments and numerical simulation in DC fields, the velocity of flow has been reported to be of the order of 10-2 ms-1 in electric fields of several kVmm-1. However, on the application of high DC electric fields to some dielectric oils, a fluid jet with a velocity of about 1 ms-1 can be created from the positive electrode as a bulk flow. In this study, the numerical simulation of EHD jet is carried out from the engineering aspects. The high speed jet flow is theoretically reproduced, and the obtained flow patterns are compared with the experimental results under the conditions of simple electrode allocations.http://jafmonline.net/JournalArchive/download?file_ID=30114&issue_ID=214Electrohydrodynamics Simulation Jet flow Dielectric fluids.engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363413423.articleUniversal Velocity Distribution for Smooth and Rough Open Channel FlowsJ. H. Pujhpu@nu.edu.kz0Assistant Professor, School of Engineering, Nazarbayev University, Astana 010000, Kazakhstan The Prandtl second kind of secondary current occurs in any narrow channel flow causing velocity dip in the flow velocity distribution by introducing the anisotropic turbulence into the flow. Here, a study was conducted to explain the occurrence of the secondary current in the outer region of flow velocity distribution using a universal expression.
Started from the basic Navier-Stokes equation, the velocity profile derivation was accomplished in a universal way for both smooth and rough open channel flows. However, the outcome of the derived theoretical equation shows that the smooth and rough bed flows give different boundary conditions due to the different formation of log law for smooth and rough bed cases in the inner region of velocity distribution. Detailed comparison with a wide range of different measurement results from literatures (from smooth, rough and field measured data) evidences the capability of the proposed law to represent flow under all bed roughness conditions.http://jafmonline.net/JournalArchive/download?file_ID=30165&issue_ID=214Universal velocity profile Secondary current Velocity dip Smooth bed flow Rough bed flow Open channel flowsengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363425433.articleBoundary Layer Receptivity to Localized Disturbances in Freestream Caused by a Vortex Ring CollisionSh. Noronoro@fluid.mech.tohoku.ac.jp0Y. Suzukiyoshimune.suzuki@unspecified.net1M. Shigetamasaya.shigeta@unspecified.net2S. Izawamenasunkur@gmail.com3Y. Fukunishiyu.fukunishi@unspecified.net4Tohoku University, 6-6-01, Aramaki-Aoba, Sendai, 980-8579, JapanTohoku University, 6-6-01, Aramaki-Aoba, Sendai, 980-8579, JapanTohoku University, 6-6-01, Aramaki-Aoba, Sendai, 980-8579, JapanTohoku University, 6-6-01, Aramaki-Aoba, Sendai, 980-8579, JapanTohoku University, 6-6-01, Aramaki-Aoba, Sendai, 980-8579, JapanThe receptivity of a smooth flat plate to localized disturbances in freestream is investigated experimentally and numerically. The disturbances are generated outside a nominally-zero-pressure-gradient laminar boundary layer by a collision of two identical vortex rings with opposite signs. The vortex rings are generated by intermittent ejections of short duration jets from nozzles facing each other in the spanwise direction. A pair of rolled up vortex rings is given as the initial disturbances in the direct numerical simulation, and the growth of a boundary layer is simulated for arange of the Reynolds number based on the displacement thickness of boundary layer, 704 ≦ Re * ≦ 844. In the experimental results, high- and low-speed regions aligned in the streamwise direction are observed in the boundary layer before the external disturbances in the freestream reach the outer-edge of the boundary layer. Although velocity fluctuations inside both regions become stronger downstream, a transition to turbulence takes place only in the highspeed region at approximately Re * = 844. In the numerical results, vortical fluctuations similar to the experiment appear near the wall immediately after the vortex-ring-type disturbances are added in the freestream, but it is found that the vortical fluctuations do not directly grow into strong vortical structures. On the contrary, the development of strong vortical structures that leads to transition is triggered by the external disturbances directly intruding the boundary layer.http://jafmonline.net/JournalArchive/download?file_ID=30116&issue_ID=214Receptivity Boundary layer Transition Vortex ring.engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363435442.articleStokes Flow around Rotating Axially Symmetric Pervious BodyD. K. Srivastavadksflow@hotmail.com0Department of Mathematics, B.S.N.V. Post Graduate College (Lucknow University, Lucknow), Lucknow(Uttar Pradesh)-226001, IndiaIn this paper, the problem of slowly rotating pervious axially symmetric body with source at its centre placed in an incompressible viscous fluid has been tackled. The method of separation of variables has been used and the general solution in terms of Legendre functions and Whittaker’s polynomial is given. As a first approximation, for n = 1, the results are in confirmation with spherical body. It is found that the effect of source at the centre is to reduce the resulting moment. Further, it has been conjectured that the results of couple for other bodies ( i.e., for n 2 ) can also be obtained on the same ground but presently it is beyond the scope of the paper and would likely to appear in the future paper.http://jafmonline.net/JournalArchive/download?file_ID=30117&issue_ID=214Slow rotation Axially symmetric bodies Source Viscous fluid Stokes approximation.engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363443451.articleUnsteady MHD Radiative and Chemically Reactive Free Convection Flow near a Moving Vertical Plate in Porous MediumT. S. Reddyt.sudhakar.reddy@unspecified.net0M. C. Rajumcrmaths@yahoo.co.in1S. V. K Varmavarmasvu@gmail.com2Department of Mathematics, Shree Rama Educational Society Group of institutions (Integrated campus), Tirupathi, Chittor District, Andhra Pradesh, 517507 IndiaDepartment of Mathematics, Annamacharya Institute of Technology and Sciences Rajampet (Autonomous), Rajampet, Kadapa District, Andhra Pradesh, 516126,IndiaDepartment of Mathematics, Sri Venkateswara University, Tirupati, Andhra Pradesh, 517502, IndiaWe have investigated an unsteady flow of a viscous, incompressible electrically conducting, laminar free convection
boundary layer flow of a moving infinite vertical plate in a radiative and chemically reactive medium in the presence of a transverse magnetic field. The equations governing the flow are solved by Laplace transform technique. The expressions for velocity, temperature, concentration are derived and based on these quantities the expressions for skin friction; rate of heat transfer and the rate mass transfer near the plate are derived. The effects of various physical parameters on flow quantities, wise magnetic parameter, Grashof number, modified Grashof number, heat source parameter, the chemical reaction parameter, Schmidt number and radiation parameter are studied numerically and the results are discussed with the help of graphs. Some important applications of physical interest for different type motion of the plate like case (i) when the plate is moving with uniform velocity, case (ii) when the plate is moving with single acceleration and case (iii) when the plate is moving with periodic acceleration, are discussed.http://jafmonline.net/JournalArchive/download?file_ID=30118&issue_ID=214Heat source or sink Chemical reaction MHD Radiation Porous medium Heat and mass transfer.engIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363453463.articleEvaluation of Eddy Viscosity Models in Predicting Free- Stream Turbulence PenetrationM. Kahrommohsen.kahrom@yahoo.co.uk0A. Shokrgozara.shokrgozar@unspecified.net1Mechanical Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran Mechanical Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran Turbulence schemes have long been developed and examined for their accuracy and stability in a variety of environments. While many industrial flows are highly turbulent, models have rarely been tested to explore whether their accuracy withstands such augmented free-stream turbulence intensity or declines to an erroneous solution. In the present study, the turbulence intensity of an air flow stream, moving parallel to a flat plate is augmented by the means of locating a grid screen at a point at which Rex=2.5×105 and the effect on the flow and the near-wall boundary is studied. At this cross section, the turbulence intensity is augmented from 0.4% to 6.6% to flow downstream. Wind tunnel measurements provide reference bases to validate the numerical results for velocity fluctuations in the main stream and at the near-wall. Numerically, four of the most popular turbulence models are examined, namely the oneequation Spalart-Almaras, the two equation Standard k , the two equation Shear Stress Transport and the anisotropy multi equation Reynolds Stress Models (RSM). The resulting solutions for the domain are compared to experimental measurements and then the results are discussed. The conclusion is made that, despite the accuracy that these turbulence models are believed to have, even for some difficult flow field, they fail to handle high intensity turbulence flows. Turbulence models provide a better approach in experiments when the turbulence intensity is at about 2% and/or when the Reynolds number is high.http://jafmonline.net/JournalArchive/download?file_ID=30119&issue_ID=214Free stream turbulence Turbulence intensity Turbulence models Turbulence penetrationengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-3572201363465471.articleInfluence of an Exit Wall Boundary on the Flow of a Circular JetA. P. Vourosalvouros@upatras.gr0M. D. Mentzosm.d.mentzos@unspecified.net1E. I. Xanthopoulose.i.xanthopoulos@unspecified.net2A. E. Filiosa.e.filios@unspecified.net3D. P. Margarisd.p.margaris@unspecified.net4Laboratory of Fluid Mechanics and Turbomachinery, School of Pedagogical and Technological Education (ASPETE), Heraklion, Athens, GR-14121, GreeceFluid Mechanics Laboratory and Applications, Department of Mechanical Engineering and Aeronautics, University of Patras, Patras, GR-26500, GreeceLaboratory of Fluid Mechanics and Turbomachinery, School of Pedagogical and Technological Education (ASPETE), Heraklion, Athens, GR-14121, GreeceLaboratory of Fluid Mechanics and Turbomachinery, School of Pedagogical and Technological Education (ASPETE), Heraklion, Athens, GR-14121, GreeceFluid Mechanics Laboratory and Applications, Department of Mechanical Engineering and Aeronautics, University of Patras, Patras, GR-26500, GreeceThe flow of the axisymmetric jet constitutes a subject of research from the origins of fluid dynamics; however it remains a subject of interest due to the recent findings that denote the influence of flow and geometry conditions in configurations that diverge from the theoretical “free-jet” case. In the present study, the effect of a wall boundary produced by a circular disk of twice the jet diameter, which is imposed on the exit of the jet is investigated experimentally and numerically. Computational simulations are performed to predict the flow characteristics incorporating different turbulence models (k-ε and Reynolds Stress) and solvers (Simplec and Coupled). Supportive pressure measurements are used to evaluate the predictions within the initial region of a circular jet at two Reynolds numbers (50,000 and 65,000). The results indicate that the presence of the exit wall boundary results to the formation of recirculation zone behind the exit, which prevents the entrainment of ambient fluid. Comparing with the flow field of the free from confinement jet, it is shown that the imposition of the wall has a minor effect on the mean velocity field; it is however capable of altering the turbulent flow properties, including the normal and the Reynolds shear stresses, in the region before the establishment of the self-similarity zone.http://jafmonline.net/JournalArchive/download?file_ID=30120&issue_ID=214Axisymmetric jet flow Turbulence Computational fluid dynamics Measurements