Mesh refinement in a two-dimensional large eddy simulation of a forced shear layer



Publisher: National Aeronautics and Space Administration, Publisher: For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va

Written in English
Published: Downloads: 360
Share This

Subjects:

  • Turbulence.

Edition Notes

Other titlesMesh refinement in a two dimensional large eddy simulation of a forced shear layer.
StatementR.W. Claus, P.G. Luang and J.M. MacInnes.
SeriesNASA technical memorandum -- 102129.
ContributionsHuang, P. G., MacInnes, J. M., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL18030409M

Turbulent Shear Flows 8: Selected Papers from the Eighth International Symposium on Turbulent Shear Flows, Munich, Germany, September , Franz Durst, Rainer Friedrich, Brian E. Launder, Frank W. Schmidt, Ulrich Schumann, James H. Whitelaw. In our previous work () 19, we developed a disk relaxation based mesh deformation method for two-dimensional mesh deformation. In this paper, the idea of the disk relaxation is extended to the sphere relaxation for three-dimensional meshes with large by: 7. Isogeometric Analysis also simplifies mesh refinement because the geometry is fixed at the coarsest level of refinement and is unchanged throughout the refinement process. This eliminates geometrical errors and the necessity of linking the refinement procedure to a CAD representation of the geometry, as in classical by: A grain boundary conforming finite element mesh is constructed using a Delaunay triangulation algorithm [31], with a provision for local mesh refinement. Mesh refinement is based on a comparison between the actual local length scale l (e.g., element circum-radius) and the desired length scale specified by a scalar variable r called the length.

  The effects of steady fluid flow through multiple bell-shaped constrictions in tubes were investigated numerically with a boundary mesh refinement method for the Reynolds number range of 5 to The multiple constrictions studied were for constrictions of 1/3, 1/2 and 2/3 of various combinations. ADAPTIVE MESH REFINEMENT PROCEDURE OF ELEMENT METHOD FOR FRACTURE MECHANICS Liang and Y.M. Lin, Department of Mining Engineering, N ortheastem University, Shenyang, People's Republic of China Abstract This paper describes an adaptive mesh refinement procedure by element method for a two-dimensional fracture mechanics problem. An adaptive mesh refinement in the finite volume method Avdeev E.V., Fursov V.A., Samara State Aerospace University Ovchinnikov V.A. Laduga Automotive Engineering Ltd. Abstract. In this paper we describe the method of adaptive mesh refinement, based on the estimation of eigenvalues of discretization matrix. This estimation. tion mesh, whereby the calculation was performed in two steps, a de ection rst to 45 and then to The mesh close to the wing is almost unchanged; because of the relatively rapid grid coarsening with distance from the surface, the algorithm is able to put the weight of the deformation onto exclusively large cells. 6 Conclusions and Further Work.

Every four years, the mechanics community from around the world gathers at the Congresses organized under auspices of the International Union of Theoretical and Applied Mechanics (IUTAM) to discuss science, strengthen relationships, and marvel at the ever-growing applications of this discipline. Following the 23rd IUTAM Congress in Beijing in , Canada had the . This journal is specifically dedicated to the dissemination of the latest developments of new engineering analysis techniques using boundary elements and other mesh reduction methods.. Boundary element (BEM) and mesh reduction methods (MRM) are very active areas of research with the techniques being applied to solve increasingly complex problems. It has been shown in [1,2] that the anisotropy is obtained by increasing the dimensions: an isotropic mesh in a higher dimensional space will correspond to an anisotropic mesh in the lower dimensional space., see an example in Figure 1. Fig. 1. An isotropic mesh in R3 (left) and the corresponding anisotropic mesh in R2 (right). This is a very. In this paper, a meshfree-enriched finite element method (ME-FEM) is introduced for the large deformation analysis of nonlinear path-dependent problems involving contact. In linear ME-FEM, the element formulation is established by introducing a meshfree convex approximation into the linear triangular element in 2D and linear tetrahedron element.

Mesh refinement in a two-dimensional large eddy simulation of a forced shear layer Download PDF EPUB FB2

I MESH REFINEMENT IN A TWO-DIMENSIONAL LARGE EDDY SIMULATION OF A FORCED SHEAR LAYER R. Claus, NASA Lewis Research Center P. Huang, Stanford University and J. MacInnes, Princeton University ABSTRACT A series of Large Eddy Simulations are made of a forced shear layer and com- pared with experimental : R.

Claus, P. Huang, J. Macinnes. Get this from a library. Mesh refinement in a two-dimensional large eddy simulation of a forced shear layer. [Russell W Claus; P G Huang; J M MacInnes; United States. National Aeronautics and Space Administration.]. A method for performing nested-grid calculations with a Large-Eddy Simulation (LES) code is described.

The grid consists of a coarse mesh and a fine mesh which overlaps the coarse in. Large Eddy simulation (LES) of shock/homogeneous turbulence have been performed at two different Mach numbers ( and 2) with four different.

In this paper a parallel adaptive mesh refinement (AMR) strategy for large eddy simulations (LES) of turbulent flows is presented. The underlying discretization of the Navier–Stokes equations is based on a finite-volume symmetry-preserving formulation, with the aim of preserving the symmetry properties of the continuous differential operators and ensure Cited by: Large-eddy simulation of flow around an airfoil on a structured mesh This work describes our first attempt to apply the technique of large-eddy simulation to a flow of aeronautical interest.

The challenge for this simulation comes from the high and merging of Cited by: ELSEVIER Large-Eddy Simulations of Shear Layers M. Lesieur Equipe "'Mod~lisation et Simulation de la Turbulence," LEGI / IMG,* Grenoble Cedex, France The main characteristics of coherent vortices with some basic elementary vortex interactions are recalled and the formalism of large-eddy simulations of turbulence are then presented, with Smagorinsky's by: 2.

In order to meet the computing requirements of large eddy simulation, the distance from the cylinder surface to the nearest mesh points are fixed at y + less than 1. In order to better capture the vortex structure in the wake region of the cylinder, the mesh in the downstream direction is refined, and the size of the mesh in the boundary layer Cited by: 1.

To deal with the problem of low computational precision at the nodes near the source and satisfy the requirements for computational efficiency in inversion imaging and finite-element numerical simulations of the direct current method, we propose a new mesh refinement and recoarsement method for a two-dimensional point source.

We introduce the mesh Cited by: 1. After validating a high fidelity Large‐Eddy Simulation solver with a detailed magnetic resonance velocimetry experiment for flow through a coral, the simulations were expanded to assess the impact of hydrodynamics on mass transfer for different coral geometries and flow by: 7.

Adaptive mesh refinement for simulating fluid‐structure interaction using a sharp interface immersed boundary method 10 May, Large eddy simulation of non-Boussinesq gravity currents with a DG method 9 May, whereas excitation of coherent structures in the shear layer benefits separation angle control.

This paper presents an algorithm for refinement of three-dimensional finite element meshes that is general enough to refine a mesh composed of any combination of the standard three-dimensional element by: CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Mesh-free approximation is used in numerical simulations of strain localization under large deformation.

An explicit displacement based mesh-free formulation is used in both two-dimensional and three-dimensional computations. The spatial isotropy of mesh-free interpolant is demonstrated. Spark ignition and expansion of a turbulent non-premixed bluff-body methane flame using Large Eddy Simulations Antonios Triantafyllidis and Epaminondas Mastorakos.

This is a graduate text on turbulent flows, an important topic in fluid dynamics. It is up-to-date, comprehensive, designed for teaching, and is based on a course taught by the author at Cornell University for a number of : Stephen B. Pope. American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Advances in Turbulence XI: proceedings of the 11th EUROMECH European Turbulence Conference, June, Porto, Portugal.

A turbulent-energy based mesh refinement procedure for Large Eddy Simulation.- High Spatial Resolution MCCDPIV in a Zero Pressure Gradient Turbulent Boundary Layer.- Interaction of Quasi Two Dimensional Flow.

In this case, advanced methods to treat turbulence, such as large eddy simulation (LES), are more appropriate, but they are also very expensive from the computational point of view, requiring fine spatial and temporal discretizations, three-dimensional meshes also for two-dimensional problems (slender prismatic elements) and long simulated time Cited by: 4.

A mesh-free Galerkin simulation of dynamic shear band propagation in an impact-loaded pre-notched plate is carried out in both two and three related experimental work was initially reported by Kalthoff and Winkler (), and. () Large-eddy simulation of shear flows and high-speed vaporizing liquid fuel sprays.

Computers & Fluids() Finite amplitude electroconvection induced by strong unipolar injection between two coaxial by: Studies of the relationship between environmental forcing and the structure and dynamics of tornado-like vortices.

Irving et al. / Invertible Finite Elements For Robust Simulation of Large Deformation 3. Measuring deformation A deformable object is characterized by a time dependent map φfrom material coordinates X to world coordinates x. The stress at a given point X in the material depends only on the deformation gradient F(X)=∂x/∂X of this mapping.

The seventh ERCOFTAC Workshop on "Direct and Large-Eddy Simulation" (DLES-7) was held at the University of Treste from SeptemberFollowing the tradition of previous workshops in the DLES-series this edition reflects the state of the art of numerical simulation of traditional and turbulent flows and provided an active forum for discussion of recent developments in.

Gianluca Iaccarino is part of Stanford Profiles, official site for faculty, postdocs, students and staff information (Expertise, Bio, Research, Publications, and more). The site facilitates research and collaboration in academic endeavors.

The method is applicable to arbitrarily shaped mesh cells and offers a framework to unify many mesh topologies into a single formulation. A finite-volume discretization is applied to the two-dimensional depth-averaged equations such that mass.

In this paper, a new algorithm for the solution of large-scale systems of differential-algebraic equations is described. It is based on the integration methods in the solver DASSL, but instead of a direct method for the associated linear systems which arise at each time step, we apply the preconditioned GMRES iteration in combination with an Inexact Newton by: Two-Dimensional Depth-Averaged Flow Modeling.

with an Unstructured Hybrid Mesh. Yong G. Lai. ABSTRACT. An unstructured hybrid mesh numerical method is developed to simulate open channel flows. The method is applicable to arbitrarily-shaped mesh cells and offers a framework to unify many mesh topologies into a single formulation.

Four levels of local mesh refinement (LMR) are used to achieve a very fine mesh resolution close to the airfoil while coarser grids are employed far away from the airfoil, as shown in Fig. The simulations run on 76 central processing units (CPUs), using Supercomputing Wales facilities, and each simulation using the finest mesh resolution Cited by: 8.

Effects of Atwood number on Kelvin-Helmholtz Instabilities Formed from Oblique Shock Interaction with a Heavy Gas Column. United States: N. Author: Jason Hoon Yoo. Professor Neil D Sandham BSc, MS, PhD, CEng, FRAeS, MAIAA In Direct and Large-Eddy Simulation X (Vol. 24, pp.

(ERCOFTAC Series; Vol. 24). Cham: Springer. Prediction of boundary layer sound radiation from wall shear stresses using DNS data.

Paper presented at 12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics. 1 An efficient adaptive polygonal finite element method for plastic collapse analysis of solids H.

Nguyen-Xuan1,2 *, Son H. Nguyen1,3, Hyun-Gyu Kim3, Klaus Hackl1 1Institute of Mechanics, Ruhr-University of Bochum, Bochum, Germany 2Center for Interdisciplinary Research in Technology, HUTECH University, Vietnam 3Department of Mechanical & Automotive .The utilization of unstructured mesh generation techniques for the simulation of boundary layer problems (Hassan,Marcum, and Thompson et al., ), (e.g.

viscous flow) and for anisotropic adaptation is of great importance (Peraire et al.,George,Borouchaki and Frey,Thompson et al., and Almeida et al., The effects of axial shear. Investigating accumulation for a different type of deformation, Figure 4 shows the accumulated variance for displacements under axial shear strain.

For axial shear, the lateral kernel size is the more important kernel dimension, so results are displayed for different lateral kernel sizes rather than different axial by: 5.