A 2-D unsteady Navier-Stokes solution method with overlapping/overset moving grids

Date

1996-01-01

Author

Tuncer, İsmail Hakkı

Metadata

Show full item record

Item Usage Stats

239
views

0
downloads

A simple, robust numerical algorithm to localize intergrid boundary points and to interpolate unsteady solution variables across 2-D, overset/overlapping, structured computational grids is presented. Overset/ overlapping grids are allowed to move in time relative to each other. The intergrid boundary points are localized in terms of three grid points on the donor grid by a directional search algorithm. The final parameters of the search algorithm give the interpolation weights at the interpolation point. The method is independent of numerical solution algorithms and it may easily be implemented on any 2-D, single block flow solver to make it a multi-block, zonal solver with arbitrarily overset/ overlapping computational grids. In the present study, numerical results are presented for steady and unsteady, viscous flow solutions over a flapping/stationary airfoil combination in tandem and over a single airfoil undergoing a sinusoidal flapping motion. The computational domains are discretized with overlapping and/or overset subgrids, which move in time relative to each other. The intergrid boundary point localization on the donor grid and the interpolation of flow variables are found to be accurate and robust. Computed flow variables are continuous across the grid boundaries and an excellent agreement is obtained against the single grid solutions.

Subject Keywords

Aerospace Engineering , Airfoils , Grid Computing , Interpolation, Learning Algorithms , Navier Stokes Equations , Numerical Methods

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84962140662&origin=inward
https://hdl.handle.net/11511/84753

Conference Name

34th Aerospace Sciences Meeting and Exhibit, 1996 (15 - 18 Ocak 1996)

Collections

Department of Aerospace Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

A 2-0 navier-stokes solution method with overset moving grids Tuncer, İsmail Hakkı (1996-01-01) A simple, robust numerical algorithm to localize moving boundary points and to interpolate uniteady solution variables across 2-D, arbitrarily overset computational grids is presented. Overset grids are allowed to move in time relative to each other. The intergrid boundary points are localized in terms of three grid points on the donor grid by a directional search algorithm. The parameters of the search algorithm give the interpolation weights at the localized boundary point. The method is independent of nu...
Two-dimensional unsteady Navier-Stokes solution method with moving overset grids Tuncer, İsmail Hakkı (American Institute of Aeronautics and Astronautics (AIAA), 1997-03-01) A simple numerical algorithm to localize intergrid boundary points and to interpolate unsteady solution variables across two-dimensional, structured overset grids is presented. Overset grids are allowed to move in time relative to each other. Intergrid boundary points are localized in a triangular stencil on the donor grid by a directional search algorithm. The final parameters of the search algorithm give the interpolation weights at the intergrid boundary point. Numerical results are presented for steady ...
A linear approximation for training Recurrent Random Neural Networks Halıcı, Uğur (1998-01-01) In this paper, a linear approximation for Gelenbe's Learning Algorithm developed for training Recurrent Random Neural Networks (RRNN) is proposed. Gelenbe's learning algorithm uses gradient descent of a quadratic error function in which the main computational effort is for obtaining the inverse of an n-by-n matrix. In this paper, the inverse of this matrix is approximated with a linear term and the efficiency of the approximated algorithm is examined when RRNN is trained as autoassociative memory.
2-D Navier-Stokes solution method with overset moving grids Tuncer, İsmail Hakkı (1996-01-01) A simple, robust numerical algorithm to localize moving boundary points and to interpolate unsteady solution variables across 2-D, arbitrarily overset computational grids is presented. Overset grids are allowed to move in time relative to each other. The intergrid boundary points are localized in terms of three grid points on the donor grid by a directional search algorithm. The parameters of the search algorithm give the interpolation weights at the localized boundary point. The method is independent of nu...
Analysis of a projection-based variational multiscale method for a linearly extrapolated BDF2 time discretization of the Navier-Stokes equations Vargün, Duygu; Kaya Merdan, Songül; Department of Mathematics (2018) This thesis studies a projection-based variational multiscale (VMS) method based on a linearly extrapolated second order backward difference formula (BDF2) to simulate the incompressible time-dependent Navier-Stokes equations (NSE). The method concerns adding stabilization based on projection acting only on the small scales. To give a basic notion of the projection-based VMS method, a three-scale VMS method is explained. Also, the principles of the projection-based VMS stabilization are provided. By using t...

Citation Formats

İ. H. Tuncer, “A 2-D unsteady Navier-Stokes solution method with overlapping/overset moving grids,” presented at the 34th Aerospace Sciences Meeting and Exhibit, 1996 (15 - 18 Ocak 1996), Nevada, Amerika Birleşik Devletleri, 1996, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84962140662&origin=inward.