Direct numerical simulation of turbulent rotating Rayleigh-Benard convection


Kunnen, R.P.J. and Geurts, B.J. and Clercx, H.J.H. (2006) Direct numerical simulation of turbulent rotating Rayleigh-Benard convection. In: Sixth International ERCOFTAC Workshop on Direct and Large-Eddy Simulation VI, 12-14 September 2005, Poitiers, France (pp. pp. 233-240).

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Abstract:The influence of rotation on turbulent convection is investigated with direct numerical simulation. The classical Rayleigh-Benard con guration is augmented with steady rotation about the vertical axis. Correspondingly, characterisation of the dynamics requires both the dimensionless Rayleigh number $Ra$ and the Taylor number $Ta$. With increasing $Ta$ the root-mean-square (rms) velocity variations are found to decrease, while the rms temperature variations increase. Under rotation a mean vertical temperature gradient develops in the bulk. Compared to the non-rotating case, at constant $Ra = 2.5\,10^6$ the Nusselt number increases up to approximately 5% at relatively low rotation rates, $Ta < Ta_m \approx 10^6$, and decreases strongly when $Ta$ is further increased. A striking change in the boundary layer structure arises when $Ta$ traverses an interval about $Ta_m$, as is expressed by the near-wall vertical-velocity skewness.
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Copyright:© 2006 Springer
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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