The flow helicity in quasi-orderedcellular convection

A. V. Getling
2012 Proceedings of the International Astronomical Union  
The helicity of cellular convective flows in a horizontal layer of compressible fluid (gas) heated from below and rotating about a vertical axis is studied using finite-difference numerical simulations. The medium is assumed to be polytropically stratified. An initial thermal perturbation is introduced so as to produce a system of Bénard-type hexagonal convection cells. The flow gradually becomes less ordered, and the mean helicity grows initially and decreases sharply after the substantial
more » ... tisation of the flow. Given the Rayleigh and Prandtl numbers, the maximum value reached by the mean helicity increases with the decrease of the polytrope index and has a maximum at a certain rotational velocity of the layer.
doi:10.1017/s1743921313002755 fatcat:q2mxatk5ynhfpgkkjp4isli6vm