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A Vortex Axis and Vortex Core Border Grid Adaptation Algorithm.

Rütten, Markus and Alrutz, Thomas and Wendland, Holger (2008) A Vortex Axis and Vortex Core Border Grid Adaptation Algorithm. International Journal for Numerical Methods in Fluids (58), pp. 1379-1405. DOI: 10.1002/fld.1792. ISSN 02712091-10970363.

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Abstract

In the design process of hydrodynamical and aerodynamical technical applications, the numerical simulation of massively separated vortical flow is crucial for predicting, for example, lift or drag. To obtain reliable numerical results, it is mandatory to accurately predict the physical behavior of vortices. Thus, the dominant vortical flow structures have to be resolved in detail, which requires a local grid refinement and certain adaptation techniques. In this paper, a vortex flow structure adaptation algorithm is presented, which is particularly designed for local grid refinement at vortex axes positions and associated vortex core border locations. To this end, a fast and efficient vortex axis detection scheme is introduced and the algorithm for the vortex core border determination is explained. As the interaction between vortices makes the assignment of grid points to a certain vortex axis difficult, a helicity-based vortex distinction approach in combination with a geometrical rotational sensor is developed. After describing the combined different techniques in detail, the vortex feature adaptation algorithm is applied to analytical and more realistic examples, which show that the described grid adaptation algorithm is able to enhance the grid cell resolution locally such that all significant vortical flow phenomena are resolved

Document Type:Article
Title:A Vortex Axis and Vortex Core Border Grid Adaptation Algorithm.
Authors:
AuthorsInstitution or Email of Authors
Rütten, MarkusUNSPECIFIED
Alrutz, ThomasUNSPECIFIED
Wendland, HolgerDepartment of Mathematics, University of Sussex, Brighton, England
Date:30 January 2008
Journal or Publication Title:International Journal for Numerical Methods in Fluids
Refereed publication:Yes
In ISI Web of Science:Yes
DOI:10.1002/fld.1792
Page Range:pp. 1379-1405
Editors:
EditorsEmail
John Wiley & Sons Inc., UNSPECIFIED
ISSN:02712091-10970363
Status:Published
Keywords:Grid Adaptation, CFD, Vortical Flow
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Dr.-Ing. Markus Rütten
Deposited On:23 Apr 2009
Last Modified:27 Apr 2009 15:58

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