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THE NONSTATIONARY DYNAMO PROJECT (water – Ga – Na experiments)

THE NONSTATIONARY DYNAMO PROJECT (water – Ga – Na experiments). Peter Frick Sergey Denisov Stanislav Khripchenko Vitaliy Noskov Dmitriy Sokoloff Rodion Stepanov Igor Shardakov Andrey Sukhanovskiy. Laboratory of Hydrodynamics, Institute of Continuous Media Mechanics, Perm, RUSSIA.

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THE NONSTATIONARY DYNAMO PROJECT (water – Ga – Na experiments)

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  1. THE NONSTATIONARY DYNAMO PROJECT(water – Ga – Na experiments) Peter Frick Sergey Denisov Stanislav Khripchenko Vitaliy Noskov Dmitriy Sokoloff Rodion Stepanov Igor Shardakov Andrey Sukhanovskiy Laboratory of Hydrodynamics, Institute of Continuous Media Mechanics, Perm, RUSSIA

  2. DYNAMO IN LABORATORY

  3. STATIONARY DYNAMO EXPERIMENTS • Riga - cylindrical crew dynamo (2000) • Karlsruhe – two-scale dynamo (2000) • Cadaraches – VKS2 (Von Karman flow in a cylinder) • Grenoble – spherical Couette-Taylor • Madison – S2T2 flow in a sphere • Mariland – Couette-Taylor flow in a 3m sphere

  4. SCREW DYNAMO IN A BRAKED TORUS • Energy accumulation • Pulse screw flow • Toroidal geometry

  5. EXPERIMENTAL SET-UPS

  6. WATER EXPERIMENT

  7. MHD channel: thickness of the wall - parameter of velocity profiles d - thickness of shell

  8. MHD channel: conductivity

  9. NONSTATIONARY SCREW DYNAMO numerical simulation upstream downstream

  10. NONSTATIONARY SCREW DYNAMO 2D-numerical simulation Channel cross-section downstream the diverter

  11. NONSTATIONARY SCREW DYNAMO 3D-numerical simulation together with W.Dobler • Cylinder under periodical • boundary conditions: • diverter at the top, • (red), • (blue), • magnetic field lines • (green) t=0.05s t=0.1s t=0.145s t=0.385s

  12. NONSTATIONARY SCREW DYNAMO 3D-numerical simulation Wolfgang Dobler and Rodion Stepanov Rm = 40

  13. GALLIUM EXPERIMENT

  14. Local transverse field in Ga flow 1 – channel 5 - box 2 – diverter 6 – motor 3 – magnet 7 - brake 4 – 3D probe

  15. Solid rotation Imposed field Induced field

  16. Induction mechanism Solid-like rotation Local rotation

  17. Time evolution no diverters right diverters \phi=90 degr.

  18. empty channel Ga without diverters Right diverters Left diverters

  19. t=0.08s t=0.15s t=0.3s no diverters right diverters left diverters

  20. Symmetries

  21. Decay Magnetic energy (gallium experiment) Kinetic energy (water experiment)

  22. Magnetic Field Pulsations Wavelet plan Pulsations energy in the band 10<f<40 Hz

  23. ALPHA-EFFECT (Ga-experiment)

  24. WELCOME ! Contact persons: Peter Frick frick@icmm.ru Rodion Stepanov rodion@icmm.ru Workshop website: http://pdd2005.icmm.ru

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