The DNS method is to be applied to a straight duct of rectangular cross section. The internal width of the duct is 0.3m and you may assume a Reynolds number of 106 . You may choose the height and length of the duct. Calculate, the typical size of a grid cell and the number of cells required to compute the flow in the domain for the duct. You must specify the domain size and calculate the value of the Kolmogorov scale.