Interaction between fixed dual particles at moderate Reynolds numbers
Författare
Redaktör
- Martin Sommerfeld
Summary, in English
Numerical simulations of 3D flow past two identical
spheres which are held fixed relative to each other at different
separation distances and angles (which describe the deviation from the centre
line of the trailing particle) are carried out. Particle Re = 300 is used
to investigate the dependency of drag and lift coefficients on the separation
distances and the angles. The simulations are performed on a Cartesian grid using the
Volume of Solid (VOS) method to represent the spherical particles. Comparison with
experimental and numerical data shows that method can accurately resolve the
flow field around the spheres and the forces they are subjected to.
Results are focused on the behaviour of forces (drag and lift) affected by the presence
of another particle. The drag of the reference and secondary sphere is greatly
affected when they are placed in tandem arrangement at a gap of 2.5 - 3d and 1.5d respectively. Similarly the
lift of the reference sphere is greatly affected in the arrangement when
the spheres are placed in the symmetry plane at gap of 1.5d and angle of
45 degrees. The effect of both forces decrease as the gap is increased in all
arrangements. The flow becomes unsteady and periodic at a separation distance of
3d for the tandem case. Irregular vortex shedding is observed at large
separation distances 6 - 9d. The results for forces coefficients and the vortex shedding show great
resemblance for the cases when the spheres are placed in symmetry plane and
plane perpendicular to it at same gaps and angles. The characteristics of the flow, wake and the vortical structures are investigated in detail in the present study.
spheres which are held fixed relative to each other at different
separation distances and angles (which describe the deviation from the centre
line of the trailing particle) are carried out. Particle Re = 300 is used
to investigate the dependency of drag and lift coefficients on the separation
distances and the angles. The simulations are performed on a Cartesian grid using the
Volume of Solid (VOS) method to represent the spherical particles. Comparison with
experimental and numerical data shows that method can accurately resolve the
flow field around the spheres and the forces they are subjected to.
Results are focused on the behaviour of forces (drag and lift) affected by the presence
of another particle. The drag of the reference and secondary sphere is greatly
affected when they are placed in tandem arrangement at a gap of 2.5 - 3d and 1.5d respectively. Similarly the
lift of the reference sphere is greatly affected in the arrangement when
the spheres are placed in the symmetry plane at gap of 1.5d and angle of
45 degrees. The effect of both forces decrease as the gap is increased in all
arrangements. The flow becomes unsteady and periodic at a separation distance of
3d for the tandem case. Irregular vortex shedding is observed at large
separation distances 6 - 9d. The results for forces coefficients and the vortex shedding show great
resemblance for the cases when the spheres are placed in symmetry plane and
plane perpendicular to it at same gaps and angles. The characteristics of the flow, wake and the vortical structures are investigated in detail in the present study.
Avdelning/ar
Publiceringsår
2007
Språk
Engelska
Publikation/Tidskrift/Serie
Proceedings of the 6th International Conference on Multiphase Flow
Dokumenttyp
Konferensbidrag
Ämne
- Fluid Mechanics and Acoustics
Conference name
6th International Conference on Multiphase Flow, 2007
Conference date
2007-07-08 - 2007-07-13
Conference place
Leipzig, Germany
Status
Published
ISBN/ISSN/Övrigt
- ISBN: 978-3-86010-913-7