Development of cartesian based mesh generator with body fitted boundary layers

Özkan, Merve
In this thesis, the development of a Cartesian based mesh generator with body-fitted boundary layer is presented. The base of the developed mesh generator consists of Cartesian mesh. However, the boundary layer handling is a challenge with Cartesian mesh. Therefore, a body-fitted boundary layer is introduced to the mesh generator by putting a customized open source mesh generator into the main Cartesian based mesh generation. The boundary layer mesh generation part comes from the customized SUMO code, which is an open source code for body-fitted boundary layer mesh. By using the customized open source code, the boundary layer mesh is generated as wedge volume elements which inflate from the triangular surface elements of the geometry. After generating the boundary layer, there is gap between the Cartesian mesh and the boundary layer wedge volume elements. Since there must be a transition to triangular surface to square surface, this transition is supplied with pyramid and tetrahedral volume mesh. Pyramid volume elements are generated at the inner boundary of the Cartesian mesh as a part of the code. Tetrahedral mesh is generated by using an open source code TetGen, which uses Delaunay tetrahedralization. The Cartesian based mesh generator with body-fitted boundary layer is developed in this thesis for less time-consuming and more efficient meshing process.


Least-squares finite element solution of Euler equations with H-type mesh refinement and coarsening on triangular elements
AKARGUN, Hayri Yigit; Sert, Cüneyt (2014-01-01)
Purpose - The purpose of this paper is to demonstrate successful use of least-squares finite element method (LSFEM) with h-type mesh refinement and coarsening for the solution of two-dimensional, inviscid, compressible flows.
Improvement in the spring analogy mesh deformation method through the cell-center concept
Yang, Yosheph; Özgen, Serkan; Kim, Haedong (2021-08-01)
The mesh deformation method is an important topic in studies involving moving boundary problems. As one of the main approaches, this method has been applied in various related studies. To address the cell inversion problem encountered in the spring analogy mesh deformation method, the present study proposes an improvement in it by cell-center concept. In addition to the linear spring between two nodal points on the mesh, the cell-center concept introduces additional fictitious springs between the cell-cente...
Implementation of physical boundary conditions into computational domain in modelling of oscillatory bottom boundary layers
Tiğrek, Şahnaz; Yılmaz, Bilgi (Wiley, 2010-11-30)
This paper discusses the importance of realistic implementation of the physical boundary conditions into computational domain for the simulation of the oscillatory turbulent boundary layer flow over smooth and rough flat beds. A mathematical model composed of the Reynolds averaged Navier-Stokes equation, turbulent kinetic energy (k) and dissipation rate of the turbulent kinetic energy (epsilon) has been developed. Control-volume approach is used to discretize the governing equations to facilitate the numeri...
Kundes, Necmettin Anil; Aksel, Mehmet Haluk; Baran, Özgür Uğraş (2019-01-01)
This paper presents a new design and analysis tool that is developed to be employed during the design process of axial flow compressors. The tool chain implemented by this design tool consists of five parts: a mean-line design tool, followed by a blade geometry parametrization tool. Then 3D blade geometry is created, next a high quality structured mesh is generated and completed by Computational Fluid Dynamics (CFD) solution. All components employed in the new tool are either new developments, or achieved b...
Bici, M. Oguz; Akar, Gözde (2010-09-29)
In this paper, we deal with layered predictive compression of animated meshes represented by series of 3D static meshes with same connectivity. We propose two schemes to improve the prediction. First improvement is using weighted spatial prediction rather than averaging neighbor vertices. The second improvement is a novel predictor based on rotation angle of incident triangles in current and previous frames. The experimental results show that around 6- 10 % bitrate reduction can be achieved by replacing the...
Citation Formats
M. Özkan, “Development of cartesian based mesh generator with body fitted boundary layers,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Mechanical Engineering., Middle East Technical University, 2019.