This project simulates a centrifugal water pump using the Steady State, Multi-Reference-Frame method (MRF) and K-Omega SST turbulence model .
The geometry includes a standard backward type pump impeller and volute casing. The initial source of the geometry was a CAD model by GrabCAD user Reza Maleki . The overall dimensions of the geometry are provided in the figure below. The flow is intake axially from the inlet pipe and exited from the shown outlet. A separate region was created to specify the MRF zone in the vicinity of the impeller.
The domain is the geometry itself and was meshed using the ‘Snappy-Hex-Mesh’ on the SimScale platform. The resulting mesh consists of approximately 3.4 million cells and is shown in the figures below.
Depending upon the requirements different boundary conditions may be chosen. Therefore, for this case a mass flow inlet condition with a static pressure outlet was used. For a given pump the flow parameters should be known to attain the accurate pressure rise. Here arbitrary values were used to demonstrate an operation example. Therefore for the inlet, a mass flow of 3 kg/s, while a static pressure value of 0 at the outlet was taken. The MRF zone was assigned a rotational velocity of 157 rad/s (1500 rpm). The simulation analysis the mean velocity and pressure field in the pump.
The results below (processed on ParaView) show the velocity vectors and pressure rise at the outlet for a cut section of the pump. The simulation provides insight as to how much pressure rise the pump creates for a given mass-flow and rotational speeds.
The pressure contours are shown by the figure below
The figures below show the velocity vectors
The figure below shows the streamlines