Structure functions in rotating Rayleigh–Bénard convection


Kunnen, R.P.J. and Clercx, H.J.H. and Geurts, B.J. (2011) Structure functions in rotating Rayleigh–Bénard convection. Journal of Physics: Conference Series, 318 (8). 082006. ISSN 1742-6588

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Abstract:A combined numerical–experimental investigation on the scaling of velocity structure functions in turbulent rotating Rayleigh–B´enard convection is carried out. Direct numerical simulations in a cylindrical domain and a horizontally periodic domain are compared with experiments using a cylindrical tank in which stereoscopic particle image velocimetry is employed. The turbulent length scales that govern the scaling of the structure functions are evaluated directly in the numerical simulations. They provide a framework for the interpretation of the structure functions. The composition of the domain (cylinder/periodic) has a quantitative effect on the length scales even in the fluid bulk. At lower rotation rates an additional scaling range due to rotation is found. At higher rotation rates a direct transition is observed from dissipation-range scaling at small separations to an uncorrelated state at larger separations.
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Copyright: © 2011 IOP Publishing
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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