Roshko number

In fluid mechanics, the Roshko number is a dimensionless number describing oscillating flow mechanisms. It is named after the American Professor of Aeronautics Anatol Roshko. It is defined as

where Ro is the dimensionless Roshko number, St is the dimensionless Strouhal number, Re is the Reynolds number, f is the frequency of vortex shedding, L is the characteristic length (for example hydraulic diameter) and ν is the kinematic viscosity of the fluid.

References

• Olim, A. M.; Riethmuller, M. L.; Gameiro da Silva, M. C. (2002). "Flowfield characterisation in the wake of a low-velocity heated sphere anemometer". Exp. Fluids 32 (6): 645–651. Bibcode 2002ExFl...32..645O. doi:10.1007/s00348-001-0403-6. 
• Ormieres, D.; Provansal, M. (1999). "Transition to turbulence in the wake of a sphere". Phys. Rev. Lett. 83 (1): 80–83. Bibcode 1999PhRvL..83...80O. doi:10.1103/PhysRevLett.83.80. 

External links

• On the Development of Turbulent Wakes From Vortex Streets PhD. Thesis by Anatol Roshko (hosted on Caltech Site).