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Sloshing of a Tanker Truck Simulation, Ansys Fluent Training

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

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Description

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.

SloshingSloshing

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.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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