Development of numerical and experimental methods for resolving of concentrated vortex structures

• Applicants: Professor Dr.-Ing. Moustafa Abdel-Maksoud; Professor Dr.-Ing. Nikolai Kornev
• Subject Area: Fluid Mechanics
• Term: from 2015 to 2018
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 263936466

• Final Report Year: 2018

Final Report Abstract

Insufficient resolution of vortex structures is one of the key problems in Computational Fluid Dynamics (CFD). The overall objective of this project is the development and validation of numerical technologies that capture a wide range of vortical scales and improve the resolution of concentrated vortices in CFD. Two strategies are pursued in the project. One is based on the further development of the vorticity confinement method in combination with the grid free vortex method (CVM), while the other is a novel hybrid approach based on combination of the grid-based finite volume method (FVM) and the grid-free vortex method (CVM). Both of these developments are strongly interlinked through jointly developed algorithm of vortex structure identification, the implementation of both methods in FVM OpenFOAM and the validation by means of comparison with experimental result of Devenport et al. (NACA0012 at 5◦ angle of attack and Re = 530000) and Birch test case (NACA0015 oscillated at small angles of attack, Re = 186000). Advantages and limitations of the finite volume and grid free CVM methods as well as a crucial influence of the turbulence models are documented for the tip vortex flows. The methods, developed in the project, can be used for a wide spectrum of the fundamental and applied problems in fluid mechanics.

Publications

• (2016), Tracking a Tip Vortex with Adaptive Vorticity Confinement and Hybrid RANS-LES. Open Journal of Fluid Dynamics, Vol. 6 No. 4
  Feder, D.-F. & Abdel-Maksoud, M.
  (See online at https://doi.org/10.4236/ojfd.2016.64030)
• (2016). Hybrid Method Based on Embedded Coupled Simulation of Vortex Particles in Grid Solution. Proc. Int. Conf. Vortex Flows and Vortex Models 2016, Rostock, Germany, pp. 85-86
  Samarbakhsh, S., & Kornev, N.
  
• (2016). Potential of the Adaptive Vorticity Confinement Method for RANS Simulations and Hybrid RANS-LES. Proc. Int. Conf. Vortex Flows and Vortex Models 2016, Rostock, Germany, pp. 40
  Feder, D.-F., & Abdel-Maksoud, M.
  
• 2016). Resolution of Tip Vortices by Coupling Vortex Method with Grid Based Simulation. Proc. Int. Conf. Vortex Flows and Vortex Models 2016, Rostock, Germany, pp. 53-55
  Dhone, M., Kornev, N., & Abbas, N.
  
• (2017). Hybrid method based on embedded coupled simulation of vortex particles in grid based solution. Computational Particle Mechanics
  Kornev, N.
  (See online at https://doi.org/10.1007/s40571-017-0167-2)
• (2017). Numerical simulation of the tip vortex behind a wing oscillated with a small amplitude. Journal of Aircraft. Vol. 54, No. 2, pp. 831–837
  Kornev, N., & Abbas, N.
  (See online at https://doi.org/10.2514/1.C033945)
• (2017). Vorticity Structures and Turbulence in the Wake of Full Block Ships. Journal of Marine Science and Technology
  Kornev N. & Abbas N.
  (See online at https://doi.org/10.1007/s00773-017-0493-3)
• (2018). Comparison of different approaches tracking a wing-tip vortex. Ocean Engineering, 147, 659-675
  Feder, D. F., Dhone, M., Kornev, N., & Abdel-Maksoud, M.
  (See online at https://doi.org/10.1016/j.oceaneng.2017.09.036)