Hareketli Ve Sabit Cisimler İçin Ağ Yama Yöntemi

Year 2017, , 592 - 603, 01.08.2017

Erdal Yılmaz

https://doi.org/10.16984/saufenbilder.309643

Abstract

Bu çalışmada  hareketli nesneler etrafında birbiri ile
örtüşen çözüm ağlarını içeren problemler için az çaba ile üretilebilen ve
yaygın olabilecek bir yöntem önerilmiş ve uygulanmıştır. Örtüşen çözüm ağ
blokları dikiş atma yöntemi kullanılarak, ağ hücre büyüklerini dikkate almak
suretiyle yumuşak yama bandı oluşturularak birleştirilmiştir. Çözüm
değerlerini aktarırken interpolasyon yapmaya ihtiyaç duyulmamaktadır. Bu
sebeple, mevcut yöntem benzer chimera yöntemine göreceli bir avantaj
sağlamaktadır. Yunuslama hareketi yapan bir kanat profile etrafındaki akış, bu
yöntemi göstermek için kullanılmıştır. Diğer test problemleri ise bu çalışmaya
özel olarak deneme amacıyla oluşturulmuş birbirine göre hareket eden çoklu
kanat profile ile uçaktan ayrılan bir nesneye benzetim yapmaktadır.

Keywords

yapısal olmayan çözüm ağı, ağ dikme, ağ uyumlandırma, hareketli ağlar, ağ adaptasyonu

Mesh Stitching Method For Moving And Stationary Bodies

Abstract

An efficient and versatile mesh method
is suggested and implemented for problems involving individual overlapping mesh
blocks around moving objects. The overlapped mesh blocks are combined using a
stitching stripe, which considers smooth transition of the mesh element size
between the blocks. Interpolation of the flow values between the mesh blocks is
not needed. This is considered as a relative advantage of this method compared
to the overset mesh method. Unsteady flow around an oscillating body test case
is used to demonstrate applicability of this method. Other test cases include
hypothetical multiple flapping airfoils in relative motion and store separation
from a store bay.

Keywords

unstructured mesh, mesh stitching, moving mesh, grid adaptation, grid stitching

References

• L. Ding, L. Zhiliang ve G. Tongqing, «An efficient dynamic mesh generation method for complex multi-block structured grid.,» Advances in Applied Mathematics and Mechanics, cilt 6, no. 01, pp. 120-134, 2014. J. Batina, "Unsteady Euler airfoil solutions using unstructured dynamic meshes," AIAA Journal 28 (8), p. 1381–1388, 1990. A. Johnson ve T. Tezduyar, «Mesh Update Strategies in Parallel Finite Element Computations of Flow Probblems with Moving Boundaries and Interfaces,» Comput. Methods Appl. Mech. Engrg.,, cilt 119, pp. 73-94, 1994. A. Montorfano, F. Piscaglia ve A. Onorati, «An extension of the dynamic mesh handling with topological changes for LES of ICE in OpenFOAM,» 2015. S. T. Miller, R. L. Campbell, C. W. Elsworth, J. S. Pitt ve D. A. Boger, «An Overset Grid Method for Fluid-Structure Interaction,» World Journal of Mechanics, no. 4, pp. 217-237, 2014. J. Benek, P. Buning ve a. S. J.L., «A 3D Chimera Grid Embedding Technique,» 1986. M. Rai, «A conservative treatment of zonal boundaries for Euler equation calculations,» Journal of Comp. Physics, cilt 62, pp. 472-503, 1986. N. Suhs ve R. Tramel, «PEGSUS 4.0 User’s Manual,» Arnold AFB TN, 1991. M. Liou ve Y. Zheng, «A Flow Solver for Three-dimensional DRAGON Grids,» 2002. P. G. Bunning, 23 February 2016. [Çevrimiçi]. Available: https://overflow.larc.nasa.gov/. N. Frink, «Recent Progress Toward a Three-Dimensional Unstructured Navier-Stokes Flow Solver,» %1 içinde AIAA Paper, 1994, pp. 94-0061. R. Noack ve D. A. Boger, «Improvements to Suggar and Dirtlib for Overset Store Separation Simulations.,» %1 içinde Proceedings of the 47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, Orlando, 2009. S. T. Miller, R. L. Campbell, C. W. Elsworth, J. S. Pitt ve D. A. Boger, «An Overset Grid Method for Fluid-Structure Interaction,» World Journal of Mechanics, cilt 4, no. 7, p. 21, 2014. E. Fadlun, R. Verzicco, P. Orlandi ve J. Mohd-Yusof, «Combined Immersed-Boundary Finite- Difference Methods for Three-Dimensional Complex Flows Simulations,» Journal of Computational Physics , cilt 161, 2000. C. Zhou ve J. Ai, «Mesh adaptation for simulation of unsteady flow with moving immersed boundaries.,» Int. J. Numer. Meth. Fluids, no. 72, p. 453–477, 2013. J. Mohd-Yusof, «Combined Immersed-Boundary/B-Spline Methods for Simulations of Flow in Complex Geometries,» Stanford, CA, 1997. R. Verzicco, J. Mohd-Yusof, P. Orlandi ve D. Haworth, «Large Eddy Simulation in Complex Geometric Configurations Using Boundary Body Forces,» AIAA Journal, cilt 38, no. 3, 2000. C. Peskin, «Flow Patterns Around Heart Valves: A Numerical Method,» Journal of Computational Physics, cilt 10, 1972. I. Borazjani, «Fluid–structure interaction, immersed boundary-finite element method simulations of bio-prosthetic heart valves,» Computer Methods in Applied Mechanics and Engineering, cilt 257, pp. 103-116, 15 April 2013. Y. Tseng ve J. Ferziger, «A ghost-cell immersed boundary method for flow in complex geometry,» Journal of Computational Physics, cilt 192, no. 2, pp. 593-623, 2003. A. Landsberg ve J. Boris, «The Virtual Cell Embedding Gridding Method: A Simple Approach for Complex Geometries,» %1 içinde Proceedings of 13th AIAA CFD Conference, paper 97-1982, 1997. F. Lazarus ve A. Verroust, «Three-dimensional Metamorphosis: A survey,» The Visual Computer, cilt 14, no. 8/9, p. 373–389, 1998. M. Ahn ve S. Lee, «Mesh Metamorphosis with Topological Transformations,» %1 içinde Proceedings of Pacific Graphics 2002: IEEE Computer Society Press; p. 481–482., 2002. G. Weber, O. Kreylos, T. Ligocki, J. Shalf, H. Hagen, B. Hamann ve K. Joy, «Extraction Of Crack-Free Isosurfaces From Adaptive Mesh Refinement Data,» %1 içinde Data Visualization 2001 (Proceedings of VisSym ’01); p 25–34, 2001. C. T. D. JR, «An Adaptive Hybrid Mesh Generation Method For Complex Geometries,» Chattanooga, 2011. B. Joe, «GEOMPACK--a software package for the generation of meshes using geometric algorithms,» Advanced Engineering Software, cilt 13, pp. 325-331, 1991. E. Yilmaz ve M. Kavsaoglu, «Euler Solution of Axisymmetric Jets in Supersonic Flow,» Journal of Spacecraft and Rockets, cilt 35, no. 1, 1998. R. Landon, «Compendium of Unsteady Aerodynamic Measurements,» AGARD Report 702, 1982.