Accepted Papers

  • The effectiveness of shape tank geometric parameters on liquid sloshing phenomenon in trapezoidal storage tanks
    Hassan Saghi and Gholam Reza Askarzadeh Garmroud, Hakim Sabzevar University, Sabzevar, Iran
    ABSTRACT
    Sloshing of liquid can increase the dynamic pressure on the storage sidewalls and bottom in tanker ships and LNG careers. In this paper, a numerical model is developed based on coupled boundary element-finite element methods to liquid sloshing modeling in trapezoidal tank with different sidewall angles, widths and water depths. Different geometric shapes such as rectangular, cylindrical, elliptical, spherical and circular conical have already been studied for ship storage tanks by other researchers. In this research, a new arrangement, i.e., trapezoidal containers is suggested for liquid storage tanks and the effectiveness of shape tank geometric parameters on liquid sloshing phenomenon in trapezoidal storage tanks were studied. Fluid is considered to be incompressible and inviscid. Therefore, Laplace equation and nonlinear free surface boundary conditions are used to model the sloshing phenomenon. The code performance for sloshing modeling is validated against available data. The results show that, with increasing sidewalls angle, the pressure on the tank perimeter decrease as it increases by 100%, maximum pressure on the tank perimeter decreases by 160%. Moreover, the results show that with increasing storage tank width, the pressure on the tank perimeter increases as it increases by 100%, maximum pressure on the tank perimeter decreases by 400-125%. Finally, the results show that with increasing water depth, the pressure on the tank perimeter decreases as it increases by 100%, maximum pressure on the tank perimeter decreases by 120-90%.
  • The Pressure distribution on the rectangular and trapezoidal storage tanks' perimeters due to liquid sloshing impact
    Hassan Saghi, Gholam Reza Askarzadeh Garmroud and Seyyed Ali Reza Emamian,Hakim Sabzevar University, Sabzevar, Iran
    ABSTRACT
    Sloshing phenomenon is a complicated free surface flow problem that increases the dynamic pressure on the sidewalls and the bottom of the storage tanks. When the storage tanks are partially filled, it is essential to be able to evaluate the fluid dynamic loads on the tank's perimeter. In this paper, a numerical code was developed to determine the pressure distribution on the rectangular and trapezoidal storage tanks' perimeters due to liquid sloshing impact. Assuming the fluid to be inviscid, the Laplace equation and the nonlinear free surface boundary conditions are solved using coupled BEM-FEM. The code performance for sloshing modeling is validated against available data. Finally, this code is used for partially filled rectangular and trapezoidal storage tanks and the pressure distribution on the tanks' perimeters due to liquid sloshing impact is estimated. The results show that the maximum pressure on the perimeter of the rectangular and trapezoidal storage tanks was decreased along the sidewalls from the top to the bottom. Furthermore, the period of the pressure distribution is different for different points on the tank's perimeter and it is bigger in the trapezoidal tanks compared to the rectangular ones.