نتایج جستجو برای: k w turbulence model
تعداد نتایج: 2592371 فیلتر نتایج به سال:
this paper presents a k- turbulence model for simulation of steady current and itsinduced vortex shedding caused by the presence of an offshore pipeline. performance of the modelaround a circular cylinder above a wall with gap to diameter ratios of 0.1, 0.35 and 0.5 underdifferent flow regimes with reynolds numbers of 1500, 2500 and 7000 is studied. the flow field iscomputed with solving the re...
چکیده: a?b(h) کنید فرض ،در این صورت برد عددی و aشعاع عددی a به ترتیب به صورت زیر تعریف می شوند. w(a)={ : v?h , ??v??=1 } w (a)=sup{?? ? : ? ?w(a)} که درآن <.,.> و?? .?? به ترتیب حاصلضرب داخلی و نرم روی فضای هیلبرت h می باشند . هورن وجانسون نشان دادند کهw?(a)?^(k ) ? (w(a^k. فرض کنید a?b(h) نرمال باشد .در این صورت رابطه ی زیر را داریم conv?(a^k )=(w(a^k ) ?)?conv(w(a)) ?^k اما...
Flow separation at water intake is the main cause of head loss and flow discharge reduction. As a result, study of shape and size of separation is very essential when designing an optimum water intake. Water intake is normally built with a 90 degree angle to the main channel flow direction. However, the flow structure in this type of water intake consists of large separation size along with ...
The assessment of turbulence model performance in predicting ow elds that are directly relevant to industrial needs has become increasingly important. In aerodynamics , many problems exist for which the performance of some turbulence models is ambiguous at best and incorrect at worst. The application of many diierent turbulence models to a particular problem is a lengthy process that can lead t...
The assessment of turbulence model performance in predicting ow elds that are directly relevant to industrial needs has become increasingly important. In aerodynamics, many problems exist for which the performance of some turbulence models is ambiguous at best and incorrect at worst. The application of many di erent turbulence models to a particular problem is a lengthy process that can lead to...
The paper shows the results of the convective heat transfer prediction in turbulent axisymmetric jets impinging onto a flat plate using the newest version (2006) of the k-ω turbulence model of Wilcox [1]. Improvements to the heat transfer predictions are obtained in the strongly strained flow regions with the impingement invariant proposed by Manceau [2] together with the F1 function proposed b...
Resistive drift-wave turbulence is studied by high-resolution numerical simulation in the limit of small viscosity (high Reynolds numbers), such that the adiabaticity parameter V is the only relevant parameter. Energy spectra exhibit a maximum at some wave-number kc, and a power law behavior for k> k+ Statistics in this range are non-Gaussian indicating strong intermittency, but are perfectly G...
Occurrence of laminar separation bubbles on solid walls of an elliptic cylinder has been simulated using a recently developed transitional model for boundary layer flows. Computational method is based on the solution of the Reynolds averaged Navier-Stokes (RANS) equations and the eddy-viscosity concept. Transitional model tries to simulate streamwise fluctuations, induced by freestream turbulen...
Influence of insertion of holes in the middle of obstacles on the flow around a surface-mounted cube
The aim of our study is to analyze the impact of insertion holes in the middle of obstacles on the flow around a surface-mounted cube, In order to do this; we studied four configurations of obstacles in a channel with a Reynods number based on obstacle height ReH = 40000. The hexahedral structured meshes were used to solve the fluid dynamics equations .The finite volume method are employed to s...
Impurity-induced turbulence suppression and reduced transport in the DIII-D tokamak* G. R. McKee, M. Murakami, J. A. Boedo, N. H. Brooks, K. H. Burrell, D. R. Ernst, R. J. Fonck, G. L. Jackson, M. Jakubowski, R. J. La Haye, A. M. Messiaen, J. Ongena, C. L. Rettig, B. W. Rice, C. Rost, G. M. Staebler, R. D. Sydora, D. M. Thomas, B. Unterberg, M. R. Wade, and W. P. West General Atomics, P.O. Box ...
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