Fluid Structure Interaction of Non–Return Valve Using CFD Technique

Non return control valve are general used in industrial applications to control the internal fluid flow. In this work, dynamic and vibration are investigated to predict the dynamic behavior of valve disc in the response to self– excited fluid flow. The simulation is done in ANSYS program ver.17.2, when the valve disc starts from it fully opened position. Dynamic mesh and UDF (User Define Function) technique can be applied to describe the motion of the valve disc at any position in pipe. The sensibility of the disk movement can be predicted for various situations such as, inlet velocity, damping system, disc weight of valve, and the pressure drop across the valve during the simulation. The simulation results show that the variation of the oscillation amplitude decrease with increase damping, whereas the amplitude is higher for a smaller damping, as the damping coefficient increases, the closing time decreases exponentially. Furthermore, it is found that the valve disc reached equilibrium more rapid. While in the case of increasing the disc weight of the valve on the contrary. The pressure drop is dependent of velocity and increase as these parameters is increased. At small angles the pressure drop is relatively large. In order to demonstrate the effective of CFD model, the simulation results are validated with experimental ones. This research provides basic information for studying check valve under certain operating condition.