Download or read book Towards Optimal Large eddy Simulation of Wall bounded Flows written by Amitabh Bhattacharya and published by ProQuest. This book was released on 2007 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: The issue of modeling the instantaneous viscous and pressure stresses at the wall is addressed via a review of the OLES simulation of turbulent channel flow performed by Das (2004). In this approach, a buffer region with zero velocity is attached adjacent to the wall, and the extended velocity field is filtered using a Fourier-cutoff filter in all directions. The instantaneous wall stresses are then obtained using a "no leakage" condition, where the energy in the buffer-region is minimized at every time-step. Some changes are introduced to the previous formulation---the nonlinear and subgrid terms in the LES equation are obtained using a nonlocal re-filtering approach and a "matched buffer" condition is used to obtain the wall stresses. Simulations performed using both the "no leakage" and "matched buffer" conditions yield statistics which compare well with DNS data. Some numerical experiments involving the linear OLES kernel are also performed, where it is shown that the positive eigenvalues in the kernel and the skew-symmetric part of the kernel are important.

Download or read book Large Eddy Simulation of Wall Bounded Flows written by and published by . This book was released on 2004 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On Large eddy Simulation of High Reynolds Number Wall bounded Flows written by Christer Fureby and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Large eddy Simulation of Wall bounded Flows Subjected to Curvature and Rotation written by Kursad Melih Guleren and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Large Eddy Simulation of Wall Bounded Turbulent Flows with Heat Transfer written by Yang Liu and published by . This book was released on 2002 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis work, large eddy simulation was used to study a variety of wall-bounded turbulent flows using a compressible finite volume formulation. Subgrid scale terms in both momentum and energy equations were modeled dynamically. Furthermore, due to the inhomogeniety of wall-bounded flows, the model was further localized to better represent the physics of the problem. The model was first applied to study the incompressible turbulent flow through a duct with square cross-section. Mean flow, law of the wall, and turbulence statistics were compared with the benchmark results of direct numerical simulation and excellent agreement was achieved. The secondary flow in the cross-section was captured. It is composed of four pairs of counter-rotating cells. The interaction between mean and secondary flow fields creates some important features and they were studied in this work. Based on incompressible duct flow, system rotation was applied to investigate the effects of rotation on the turbulent flow field. The system rotation was found to reduce turbulence level on the leading side, while increase turbulence level on the trailing side. Because of the rotation, the secondary flow field in non-rotating duct was found to be diminished at weaker rotation and even eliminated at stronger rotation. Instead, a pair of counter rotating cells called Taylor-Görtler vortices, as well as the Taylor-Proudman regime, was found to exist in the cross-section, which is consistent with the results of the literature. Large eddy simulation was also applied to investigate the effects of ribs and system rotation on heat transfer in a channel. It was found that a rib creates recirculation zones near the rib. The turbulence level is at its maximum near the ribs. The existence of ribs enhances heat transfer significantly over the plane channel, as well as creates low-heat-transfer-coefficient region in the recirculation zones. This means a balance is needed between global enhancement and local suppression. With system rotation, heat transfer is greatly enhanced on the trailing side, while significantly reduced on the leading side.

Download or read book Modeling Turbulence Using Optimal Large Eddy Simulation written by Henry Chang and published by . This book was released on 2012 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most flows in nature and engineering are turbulent, and many are wall-bounded. Further, in turbulent flows, the turbulence generally has a large impact on the behavior of the flow. It is therefore important to be able to predict the effects of turbulence in such flows. The Navier-Stokes equations are known to be an excellent model of the turbulence phenomenon. In simple geometries and low Reynolds numbers, very accurate numerical solutions of the Navier-Stokes equations (direct numerical simulation, or DNS) have been used to study the details of turbulent flows. However, DNS of high Reynolds number turbulent flows in complex geometries is impractical because of the escalation of computational cost with Reynolds number, due to the increasing range of spatial and temporal scales. In Large Eddy Simulation (LES), only the large-scale turbulence is simulated, while the effects of the small scales are modeled (subgrid models). LES therefore reduces computational expense, allowing flows of higher Reynolds number and more complexity to be simulated. However, this is at the cost of the subgrid modeling problem. The goal of the current research is then to develop new subgrid models consistent with the statistical properties of turbulence. The modeling approach pursued here is that of "Optimal LES". Optimal LES is a framework for constructing models with minimum error relative to an ideal LES model. The multi-point statistics used as input to the optimal LES procedure can be gathered from DNS of the same flow. However, for an optimal LES to be truly predictive, we must free ourselves from dependence on existing DNS data. We have done this by obtaining the required statistics from theoretical models which we have developed. We derived a theoretical model for the three-point third-order velocity correlation for homogeneous, isotropic turbulence in the inertial range. This model is shown be a good representation of DNS data, and it is used to construct optimal quadratic subgrid models for LES of forced isotropic turbulence with results which agree well with theory and DNS. The model can also be filtered to determine the filtered two-point third-order correlation, which describes energy transfer among filtered (large) scales in LES. LES of wall-bounded flows with unresolved wall layers commonly exhibit good prediction of mean velocities and significant over-prediction of streamwise component energies in the near-wall region. We developed improved models for the nonlinear term in the filtered Navier-Stokes equation which result in better predicted streamwise component energies. These models involve (1) Reynolds decomposition of the nonlinear term and (2) evaluation of the pressure term, which removes the divergent part of the nonlinear models. These considerations significantly improved the performance of our optimal models, and we expect them to apply to other subgrid models as well.

Download or read book On the Large eddy Simulation of Transitional Wall bounded Flows written by Ugo Piomelli and published by . This book was released on 1989 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Large Eddy Simulation of High Reynolds Number Free and Wall bounded Flows written by C. Fureby and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Large Eddy Simulation for Incompressible Flows written by P. Sagaut and published by Springer Science & Business Media. This book was released on 2006 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: First concise textbook on Large-Eddy Simulation, a very important method in scientific computing and engineering From the foreword to the third edition written by Charles Meneveau: "... this meticulously assembled and significantly enlarged description of the many aspects of LES will be a most welcome addition to the bookshelves of scientists and engineers in fluid mechanics, LES practitioners, and students of turbulence in general."

Download or read book Wall Modeling Techniques for Large Eddy Simulation written by and published by . This book was released on 2002 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the LEE of high Reynolds number wall-bounded flows, wall modeling is needed to alleviate the severe near-wall resolution requirement. Simple algebraic models such as the instantaneous log-law are inadequate for predicting complex flows with strong pressure gradients and separation. We have explored two classes of wall models: those based on the turbulent boundary-layer (TBL) equations and those based on control theory. Recent application of the TBL equation model to LEE of the flow over a cylinder at super-critical Reynolds number is discussed. The emphasis of the report is on control based wall modeling, in which sub-optimal control strategy is used to find the wall stresses that will force the outer LEE toward a target profile. Results from channel-flow simulation indicate that in order to obtain the correct mean velocity profile (the log law), the wall stresses must not only model the physics but also compensate for numerical and SGS modeling errors. The data generated by this sub-optimal control strategy are then used to derive a linear stochastic estimate model. The mathematical formulation and issues of key importance in control-based wall modeling are detailed. Efforts towards a predictive and inexpensive wall model in the control framework are detailed.

Download or read book Efficient Wall Modeling for Large Eddy Simulations of General Non equilibrium Wall bounded Flows written by Joan Calafell Sandiumenge and published by . This book was released on 2019 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main purpose of this thesis has been to contribute to the development of methodologies for wall modeling Large Eddy Simulations (LES) of wall-bounded flows, especially those at high Reynolds numbers. This flow configuration is widely found in a vast range of industrial applications. Unfortunately, given the physical nature of boundary layers, their accurate numerical resolution can be computationally unaffordable. Wall modeling aims at reproducing the inner layer effects on the flow without resolving it explicitly. This allows performing accurate numerical simulations of high Reynolds number wall-bounded flows at a fraction of the cost that would be incurred if the inner layer was temporally and spatially resolved. This work comprises six chapters. The first one is an introduction to the existing Computational Fluid Dynamics (CFD) approaches, from the most accurate and general methodologies to the most simplified and specific techniques. The second chapter introduces relevant physical magnitudes to be analyzed to ensure the reliability of a given high fidelity CFD simulation. Spatial and temporal aspects, both crucial for a correct and accurate resolution of a turbulent flow, are considered. In the third chapter, a Two-Layer wall shear stress model (TLM) for LES and suitable for non-equilibrium flows and complex geometries is presented. Wall shear stress models in general, and RANS-based wall models (WM) in particular, are affected by the "log-layer mismatch" (LLM) and the resolved Reynolds stresses (RRS) inflow problems which undermine the quality of the WM numerical predictions. The model presented in this work features a temporal filter in the WM/LES interface which allows solving both problems at once with a single and low-computational-cost step. Until now, these two problems have been dealt with separately with different techniques, which in some cases were complex and computationally expensive. On the other hand, a methodology intended to determine the optimal temporal filter length is proposed and validated in equilibrium and non-equilibrium conditions. This new technique is based on the velocity power spectrum which reveals the flow characteristic time-scales in the near-wall region. According to the results obtained in the validation tests, it is concluded that for RANS-based TLM methods, time-resolved frequencies higher than the energy-containing/inertial range limit must be filtered. In chapter four, the mathematical model of the TLM, based on the URANS equations, is presented. Moreover, its numerical resolution through the finite volume method is developed and finally summarized in a flow-chart. Then, in chapter five, the algorithmic implementation of the numerical model described in chapter four is presented. The TLM is a fully operational and independent CFD solver based on the URANS equations, which has been developed from scratch. Given that the primary objective of wall modeling is reducing the computational costs, an efficient algorithmic and parallel implementation is a key aspect of the global modeling strategy. Thus, the parallel efficiency is evaluated through a strong scalability test. Good results are obtained although some aspects to be improved are identified. Finally, in the last chapter, general conclusions concerning the whole work are given together with future research proposals aimed at going further in the methodologies studied in this thesis.

Download or read book A New Two scale Model for Large Eddy Simulation of Wall bounded Flows written by Ayse Gul Gungor and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new hybrid approach to model high Reynolds number wall-bounded turbulent flows is developed based on coupling the two-level simulation (TLS) approach in the inner region with conventional large eddy simulation (LES) away from the wall. This new approach is significantly different from previous near-wall approaches for LES. In this hybrid TLS-LES approach, a very fine small-scale (SS) mesh is embedded inside the coarse LES mesh in the near-wall region. The SS equations capture fine-scale temporal and spatial variations in all three cartesian directions for all three velocity components near the wall. The TLS-LES equations are derived based on defining a new scale separation operator. The TLS-LES equations in the transition region are obtained by blending the TLS large-scale and LES equations. A new incompressible parallel flow solver is developed that accurately and reliably predicts turbulent flows using TLS-LES. The solver uses a primitive variable formulation based on an artificial compressibility approach and a dual time stepping method. The advective terms are discretized using fourth-order energy conservative finite differences. The SS equations are also integrated in parallel, which reduces the overall cost of the TLS-LES approach. The TLS-LES approach is validated and investigated for canonical channel flows, channel flow with adverse pressure gradient and asymmetric plane diffuser flow. The results suggest that the TLS-LES approach yields very reasonable predictions of most of the crucial flow features in spite of using relatively coarse grids.

Download or read book A New Eddy Based Model for Wall Bounded Turbulent Flows written by and published by . This book was released on 2010 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental studies of wall-bounded turbulent flows were conducted with the aim of developing models that capture its correct spectral behavior and that allow prediction of Reynolds stress distributions in wall-bounded flows across a large range of Reynolds numbers. The model accounts for the recent new findings in wall turbulence concerning large-scale motions and the interaction with the wall and drag producing mechanisms. The experimental results shed light on the important differences between pipe, channel and boundary layer flows, which to date have been regarded as equivalent. The model forms the basis of a new approach to the near-wall model problem in LES (large-eddy simulation), and preliminary results show it to work effectively as a correction scheme for spatial resolution effects in hot-wire anemometry measurements in wall-turbulence.

Download or read book On the Large eddy Simulation of Transitional Wall bounded Flows written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1989 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Large eddy Simulation of Wall bounded Turbulent Flows written by Luca di Mare and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Potential of Large Eddy Simulation for the Modelling of Wall Bounded Flows written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling Techniques for Large Eddy Simulation of Wall Bounded Turbulent Flows written by Timofey Mukha and published by . This book was released on 2018 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: