Structure of Turbulent Motion in Thermal Convection

本研究的目的是继续开发和使用高分辨率粒子图像测速仪来测量水中从下面加热时的瞬时速度场。此外，温度将被测量，并与动量相结合，以研究选定的大尺度结构作为瑞利数的函数。这些结果，连同描绘速度场演变的合适的照片序列，将用于研究大尺度和小尺度运动之间的关系，特别是在制定改进的亚网格尺度应力关系方面（大涡流）湍流数值模拟。//

The objective of this research is the continued development and use of a high resolution particle image velocimeter to measure instantaneous velocity fields in water when the latter is heated from below. In addition, temperature will be measured and combined with momentum to investigate selected large-scale structures as a function of the Rayleigh number. These results, together with a suitable sequence of photographs depicting the evolution of the velocity field, will be used to investigate the relationship between large and small scales of motion, especially with respect to formulating improved relationships for sub-grid scale stresses in (large eddy) numerical simulations of turbulence.//