IJIRST –International Journal for Innovative Research in Science & Technology| Volume 4 | Issue 2 | July 2017 ISSN (online): 2349-6010
Study of Sloshing Impact on the Tanker Wall for Different Fluids with Varying Accelerations Ratna Kumar Gotru PG Student Department of Mechanical Engineering Gudlavalleru Engineering College, AP
Dr. P. Ravindra Babu Professor Department of Mechanical Engineering Gudlavalleru Engineering College, AP
Abstract In this Thesis three types of fluids are used to study the effect of sloshing in a tanker. Sloshing is the phenomena that occur in a partially filled tanker. Sloshing is the periodical oscillations in a tanker due to the external disturbances. In some stable conditions sloshing generally leads to cyclic stress and fatigue in thin walled tank structures. If that effect is nearer to the natural frequency of the tanker then beating phenomenon takes place which leads to severe collapse. Earlier various studies were made experimentally and numerically to analyze the effect of sloshing on the fuel tank. In this work transient analysis is performed using ANSYS 14.5. A Sequence of numerical experiments has been carried out to estimate the pressure developed over the tanker wall and the free surface displacement of the fluids from its mean static level. Simulations are compared for the three different fluids to validate the effect of sloshing on the tanker. This is performed for variable accelerations and the results are compared. It was found from CFD transient simulation of fluids interface with tanker periphery. Keywords: Sloshing, ANSYS, VOF, Elliptical fuel storage tanker _______________________________________________________________________________________________________ I.
INTRODUCTION
The tankers that are transporting undergo motion in the liquid due to its nature. When the tank is semi-filled or partially filled the fluid inside will slosh. Sloshing takes in different ways and there few mechanism that the liquid experience when it was subjected to external disturbances or excitations. This kind of slosh creates huge impact over the tanker body. Then the liquid will move to and fro. Such phenomenon is called as sloshing. If this sloshing frequency is equal to the natural frequency of the tanker body then beating phenomenon takes place. That leads to a blast or complete collapse of the tanker. Especially in aerospace applications these slosh loads will result the instability of the vehicle. These slosh loads will be experienced due to two main reasons, namely type of disturbance and due to the shape of the tanker. Due to sloshing hydro dynamic forces and moments will be posed on the tanker body that will cause cyclic loading on the tanker periphery. II. MODELLING AND ANALYSIS The tanker we consider for analysis follows Indian standard notation. The dimensions of the tanker are considered from IS 13187. Based on these dimensions we modeled the tanker in CREO PARAMETRIC 3.0 and analysis was carried in ANSYS Fluent 14.5. The dimensions are tabulated below in table-1 S. No 1 2 3 4 5
Table - 1 Specifications of the tanker Designation of tanker Dimensions in mm Length (L) 4780 Width (W) 2236 Height (H) 1270 Thickness of the sheet metal 3.3 (t) (VOF< 25 liters) Total Trailer Length (Lt) 4980
The model of the tanker is elliptical in shape which we can observe in fig 1.
Fig. 1: The shape of the tanker in CREO 3.0
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