The turbulent flow in thermal convection is expected to be strongly anisotropic. However, new numerical results show that the flow is nearly isotropic. The ring spectrum E(k,θ), which is essentially energy of a Fourier mode at a wavenumber k and polar angle θ, is almost independent of θ. The energy flux and shell-to-shell transfers in turbulent convection are also quite similar to isotropic hydrodynamic turbulence.
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