# Sloshing of a Tanker Truck CFD Simulation, Ansys Fluent Training

\$180.00 Student Discount

In this project, the sloshing of a tanker truck has been simulated, and the results have been investigated.

## Sloshing of a Tanker Project Description

In this project, Ansys Fluent software has been used to simulate the sloshing of a tanker truck. The Volume of  Fluid (VOF) model has been used to simulate and solve the two-phase flow field equations. The primary phase is air and, the secondary phase is water. The truck brakes at the speed of 15 m/s, and after 3 seconds, it stops. This means that in addition to gravity acceleration, the water inside the tanker feels the brake deceleration.

## Geometry & Mesh

The geometry of the present model is generated using SpaceClaim software. The tanker dimension is 12300* 1900.1867 mm.  The meshing of the present model has been done using Ansys Meshing software. The mesh type is structured in all of the computational domains, and the cell number is equal to 233,700.

## Sloshing of a Tanker CFD Simulation Settings:

We consider several assumptions to simulate the present model:

1. Due to the incompressibility of the flow, the pressure-based solver method has been selected.
2. The simulation is transient.
3. The gravity effect is considered equal to -9.81 m.s-2 on Y-axis
4. The brake deceleration is considered at the first 3 seconds equal to 5 m.s-2 on X-axis

The K-epsilon Realizable viscous model with Scalable wall function has been used to solve the turbulent flow equations. The pressure-velocity coupling scheme is SIMPLE. The second-order upwind discretization method has been used for Momentum, Turbulent kinetic energy, and Turbulent dissipation rate.

The following table represents a summary of the defining steps of the problem in this project and its solution:

 General Solver Type Pressure-based Time Transient Gravity X IF(t<=3[s],5[m/s^2],0[m/s^2]) Y -9.81 [m/s^2] Z 0 Models Multiphase Model Volume of Fluid Number of Eulerian phases 2(air & water) Interface modeling Sharp Formulation Explicit Primary phase air Secondary phase water Phase interaction Surface Tension coefficient[N/m] Constant = 0.072 Viscous k-epsilon Realizable Near wall treatment Scalable wall functions Material Properties Air Density 1.225 viscosity 1.7894e-05 water-liquid Density 998.2 viscosity 0.001003 Methods Pressure-Velocity Coupling SIMPLE Pressure PRESTO Momentum Second-order upwind Turbulent kinetic energy Second-order upwind Turbulent dissipation rate Second-order upwind Volume fraction Compressive Initialization Initialization methods Standard Patch Phase water Variable Volume Fraction Zones to patch Water_mesh_ Value 1 Run calculation Time step size 0.002 Max iterations/time step 20 Number of time steps 5000

## Sloshing of a Tanker Results

After the solution process is completed, contours of velocity, Pressure, Water volume fraction, Eddy viscosity, Streamline, and Turbulence intensity are extracted. As can be seen, under the influence of gravity and deceleration, the water inside the truck tanker moves and hits the front wall of the tanker. After 3 seconds, the truck stops, and, since that time, only gravity affects the water.

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