This project simulates a transient analysis of a centrifugal pump with a rotating mesh using Arbitrary Mesh Interface (AMI) approach and K-Omega SST turbulence model .
The geometry has a backward type pump impeller with a volute casing around it. The initial source of the geometry was a CAD model by GrabCAD user Reza Maleki . The dimensional extents of the geometry can be viewed by the the figure below. The flow enters the domain from the inlet and exited from the outlet shown. To define the rotating mesh region an AMI zone was created around the impeller.
The geometry domain was meshed using the ‘Snappy-Hex-Mesh’ on the SimScale platform. The rotating mesh AMI zone is highlighted by blue region in the mesh clip with the same meshing process as that for a Multi-Reference Frame (MRF) approach. Therefore, the mesh used for this analysis is same as the steady state case of ‘Centrifugal Pump’ and consists of approximately 3.4 million cells.
The boundary conditions chosen for this case are a mass flow inlet condition with a static pressure outlet. For the purpose of comparison the boundary condition values used are kept as a mass flow inlet of 3 kg/s and a static pressure outlet with value 0. The rotating AMI zone was also assigned a similar rotational velocity of 157 rad/s (1500 rpm). For the Time differentiation the first order Euler implicit scheme was used with a time step value of 2.5e-4. Total simulation time of 1 second was simulated using 16 compute cores and the run took less than 40 hours.
The simulation analysis the instantaneous flow in the pump. The computed results (processed on ParaView) show the instantaneous velocity field and instantaneous pressure profile for a section plane. The simulation provides insight into the time dependent changes in the flow.
The pressure contours are shown by the figure below
The figures below show the velocity vectors and streamline.