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Temperature and velocity gradients in turbulent convection

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High-resolution direct numerical simulations based on the finite difference and spectral element methods are used to study the fine-structure of convective turbulence in different regions of the convection cell. Similar to previous studies in homogeneous box turbulence and simple shear flows, it turns out that the resolution requirements are then much more demanding in comparison to the standard grids used to study large-scale features of turbulence. We investigate the distributions of the locally varying dissipation and diffusion scales which are connected with high-amplitude events of the dissipation rate fields.

Author(s):

Joerg Schumacher    
TU Ilmenau
Germany

Janet Scheel    
Occidental College Los Angeles
United States

Mohammad Emran    
TU Ilmenau
Germany