Acomparision of conforming and non-conforming mesh methods for flow around a circular cylinder in non-inertial frame of references
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Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/191979
Tipus de documentText en actes de congrés
Data publicació2015
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
For applications with large physical domains and large body displacements it is
of vital importance to use an accurate and computationally affordable numerical method. The
objective of the present study is to compare the accuracy and computational expenses of an
immersed boundary method (using IB interpolation) with those of a boundary-conforming
numerical method. For the latter, the Navier-Stokes equations were solved using cylindrical
coordinates [1]. The same boundary conditions for inlet and outlet were applied in both
simulations. In both cases a non-inertial frame of reference was applied to be able to model
moving boundaries [2]. The vortical structures that appear behind the cylinder, as well as the
drag and lift coefficients and the Strouhal number for forced and vortex-Induced-Vibrations
(VIV) are compared under various conditions. Although in cylindrical coordinates the
definition of the boundary condition at the cylindrical wall is more accurate, the definition of
the outflow condition was found to be problematic due to the usage of the moving frame of
reference. The simulation results show that both approaches produce acceptable results.
When using a similar number of mesh points, the simulation using cylindrical coordinates is
less expensive, though the need for a larger computational domain when using cylindrical
coordinates (to overcome difficulties in the definition of the outflow boundary conditions)
again increases the computational costs of this method.
ISBN978-84-943928-3-2
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Coupled-2015_94-A comparision of conforming.pdf | 751,9Kb | Visualitza/Obre |