Turbulente Diffusion: Experimentelle Untersuchung, Modellierung und Direkte Numerische Simulation

• Antragsteller: Professor Dr.-Ing. Martin Oberlack; Professor Dr.-Ing. Cameron Tropea
• Fachliche Zuordnung: Strömungsmechanik
• Förderung: Förderung von 2005 bis 2010
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 5453979

• Erstellungsjahr: 2011

Zusammenfassung der Projektergebnisse

Results of direct numerical simulations (DNS) of vibrating grid turbulence are presented. Turbulence is generated at a grid in the plane which vibrates normally to itself. There is no mean velocity in the flow. Hence, in a statistical sense turbulence is generated in a plane and diffuses out while at the same time gets damped due to dissipation. Due to zero mean shear there is no production of turbulence apart from the region at grid. Numerical simulations for two different Reynolds numbers (based on an amplitude and frequency of the grid) Re = 500, 1000, 3000 were performed using a spectral code. Statistics of turbulence was accumulated. The evolution of a turbulent/non-turbulent interface (TNTI) was detected and compared to the theory and good agreement between DNS and theoretical results was found.

Projektbezogene Publikationen (Auswahl)

• Simultaneous Two Scale Experiments in a Turbulent Flow With System Rotation. Experiments in Fluids
  Kinzel M., Wolf M., Holzner M., Lüthi B., Tropea C. and Kinzelbach W.
  
• 3D-2D Transition in Inhomogeneous Rotating Turbulent Flow. ERCOFTAC Special Bulletin on Environmental Flows, 2008
  Lüthi B., Kinzel M., Liberzon A., Holzner M., Holzner M., Tropea C., Kinzelbach W. and Tsinober A.
  
• Scaling Laws of Turbulent Diffusion: an Experimental Validation. 14th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 2008
  Kinzel M., Holzner M., Lüthi B., Tropea C., Kinzelbach W. and Oberlack M.
  
• 3D-PTV Experiments in a Turbulent Flow With System Rotation. 8th International Symposium on Particle Image Velocimetry, Melbourne, Australia, 2009
  Kinzel M., Holzner M., Lüthi B., Liberzon A., Tropea C. and Kinzelbach W.
  
• Experimental and Modelling Study of Turbulence Under Zero-Mean-Flow Conditions. 6th Symposium of Turbulence and Shear Flow Phenomena, Seoul, South Korea, 2009
  Sirbubalo E., Kinzel M., Jakirlic S. and Tropea C.
  
• Experiments on the Spreading of Shear-Free Turbulence Under the Influence of Confinement and Rotation. Experiments in Fluids, 47:801-814, 2009
  Kinzel M., Holzner M., Lüthi B., Tropea C., Kinzelbach W., and Oberlack M.
  
• Particle Tracking Velocimetry in Transitional Plane Couette Flow. ETC12, Marburg, Germany, September, 2009
  Lüthi B., Holzner M., Kinzel M., Liberzon A. and Tsinober A.
  
• Simultaneous Two Scale Experiments via Particle Tracking Velocimetry: a Feasibility Study. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 106:103-111, 2009
  Kinzel M., Holzner M., Lüthi B., Liberzon A., Tropea C. and Kinzelbach W.
  
• “DNS of vibrating grid turbulence“. European Turbulence Conference 12 (ETC12), Marburg, Sept. 7 - 10, 2009
  Khujadze G., Oberlack M.
  
• “DNS of vibrating grid turbulence“. Turbulence and shear flow phenomena (TSFP6), 22.-24.6., Seul, Korea, 2009
  Khujadze G., Oberlack M.
  
• “DNS of vibrating grid turbulence“. ITI2010, Italy, 2010
  Khujadze G., Oberlack M.
  
• “Experimental Investigation of Turbulence under the Influence of Confinement and Rotation”. Ph.D. Thesis (Technische Universität Darmstadt), 2010
  Kinzel M.