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.

PDF
Restricted to UT campus only: Request a copy
139Kb

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.
Item Type:	Conference or Workshop Item
Copyright:	© 2006 Springer
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Mathematics of Computational Science (MaCS)
Link to this item:	http://purl.utwente.nl/publications/66890
Official URL:	http://dx.doi.org/10.1007/978-1-4020-5152-2_27
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Show download statistics for this publication

Repository Staff Only: item control page

Metis ID: 238769