**2. Geometric Model and Computational Grid**

A low specific speed pump was designed with the following parameters: flow rate Q = 13 m3/h, head H = 26 m, rotational speed n = 2880 r/min, impeller inlet diameter D1 = 44 mm, outlet diameter D2 = 146 mm, outlet width b2 = 6 mm, blade outlet angle β<sup>2</sup> = 40◦, blade wrap angle φ = 120◦, blade thickness from inlet to outlet was 2 mm to 5 mm, blade number z = 5. The width of the volute was B3 = 18 mm and the diameter of the volute outlet is D4 = 40 mm. The geometric model is shown in Figure 1.

**Figure 1.** Geometric model.
