Coupling of turbulence wall models and immersed boundaries on Cartesian grids
نویسندگان
چکیده
An improved coupling of immersed boundary method and turbulence wall models on Cartesian grids is proposed, for producing smooth surface pressure skin friction at high Reynolds numbers. Spurious oscillations are frequently observed these quantities with most modeling methods, especially the which found to be very sensitive solid surface's position orientation against grids. The problem originates from irregularity distance stair-step grid boundaries where conditions applied. To reduce this directional error, several modifications presented enhance near solution. First, commonly used interpolation flow velocity replaced by one velocity, has much less variation wall. concept using a fictitious point retrieve fields in normal direction abandoned performed parallel plane existing fluid points. Secondly, gradients approximated computed advanced schemes gradient tangential reconstructed laws. further protect solution, working viscosity Spalart-Allmaras model enforced their theoretical solutions interior close Additionally, various post-processing algorithms reconstructing force integrations investigated. Other related factors also discussed effects results. validity present been demonstrated through numerical benchmark tests flat plate zero gradient, both aligned inclined respect grid, as well aerodynamic cases NACA 23012 airfoil NASA trap wing.
منابع مشابه
Parallel large-eddy simulations of turbulent flows with complex moving boundaries on fixed Cartesian grids
A parallel embedded boundary approach for large-eddy simulations of turbulent flows with complex geometries and dynamically moving boundaries on fixed orthogonal grids is presented. The underlying solver is based on a second-order fractional step method on a staggered grid. The boundary conditions on an arbitrary immersed interface are satisfied via second-order local reconstructions. The paral...
متن کاملA Cartesian Grid Method for Viscous Incompressible Flows with Complex Immersed Boundaries
A CARTESIAN GRID METHOD FOR VISCOUS INCOMPRESSIBLE FLOWS WITH COMPLEX IMMERSED BOUNDARIES T. Ye1, R. Mittal2 Department of Mechanical Engineering University of Florida Gainesville, Florida, 32611 H. S. Udaykumar3 and W. Shyy4 Department of Aerospace Engineering, Mechanics and Engineering Science University of Florida Gainesville, Florida, 32611 ABSTRACT A Cartesian grid method has been develope...
متن کاملFlow Visualization on Hierarchical Cartesian Grids
Due to the limitations of the traditional finite volume CFD approach modern Lattice-Boltzmann methods are becoming more and more widespread. The results of developing an efficient visualization and exploration tool based on the Lattice-Boltzmann solver PowerFlow are summarized here to give the reader a basic insight into the pros and cons of such an approach. Also, the implementation of an auto...
متن کاملA second-order curvilinear to Cartesian transformation of immersed interfaces and boundaries. Application to fictitious domains and multiphase flows
متن کامل
A Domain-Decomposed Multilevel Method for Adaptively Refined Cartesian Grids with Embedded Boundaries
Preliminary verification and validation of an efficient Euler solver for adaptively refined Carte-sian meshes with embedded boundaries is presented. The parallel, multilevel method makes use of a new on-the-fly parallel domain decomposition strategy based upon the use of space-filling curves, and automatically generates a sequence of coarse meshes for processing by the multigrid smoother. The c...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Computational Physics
سال: 2021
ISSN: ['1090-2716', '0021-9991']
DOI: https://doi.org/10.1016/j.jcp.2020.109995