studying the flow past and equilateral triangle at low Reynolds number, the typical geometry is shown as in the picture, dimension b can be chosen where the a relation of the dimensions can be shown in the second picture . What practical example can this shape show according to the chosen dimension b

Figure 1:Case I AssignmentBriefing The case you are studying is flow past an equilateral triangle at low Reynolds number of 10-20, the typical geometry is shown in Figure 1 and 2. You need to choose one Reynolds number within the range of 10-20. You also need to choose the dimension of ' b ' in Fig. 1 by yourself, and the other dimensions can be calculated based on their relations. Xu=12b,Xd=20b,b/H=0.5. The Reynolds number is defined as Re=Ub/