Research on the dynamic characteristics of control ball valve based on sliding mesh technique

Taking a control ball valve as the research object, a three-dimensional unsteady numerical simulation of its dynamic characteristics during closing process was carried out based on the sliding grid and RNG turbulence model. The calculation results show that: in the closing process of the control ball valve, the flow field distribution is relatively uniform at first, and with the decrease of the opening, the flow field begins to be disturbed violently, and eddy current appears, and the velocity distribution is more and more uneven. At the same time, the pressure loss, flow resistance coefficient valve opening decreases gradually increase, and the flow coefficient decreases gradually with the decrease of valve opening.