Piv Measurement Of Violent Sloshing Flows And Comparison With Cfd Computations

In this study, a sloshing model test was conducted using particle image velocimetry (PIV) equipment, and the sloshing impact characteristics were compared to those found using computational fluid dynamics (CFD). A 2-D rectangular tank filled with water and air was used, with the specified excitations inducing impact without an air pocket at the top corner of the tank. In the model test, a high-speed camera and pressure measurement system were triggered at the same time using a synchronizer system in order to obtain the velocity of the fluid and pressure simultaneously. In numerical computations, two different codes, an in-house code and commercial software, were applied. The present in-house code was based on a finite difference discretization and constraint-interpolation-profile method using an interface-capturing method to treat the interface between the air and water. In the commercial software, a volume-of-fluid approach and Eulerian multiphase model were applied for simulating the violent flows, and an adaptive mesh model was used to reduce the computation time. The sensitivity of numerical parameters such as type of mesh model, grid spacing, and time segment to the impact pressure was observed. In addition, the calculated results of the pressure at the center of the sensor and the spatially averaged pressure over the sensor were compared. Based on the sensitivity studies of computational parameters and repeatability tests in the sloshing model test, a comparison of the impact pressure, pressure impulse, and velocity fields of the numerical computations and experiment was made. Finally, the relationship between the fluid velocity and impact pressure was investigated.