# Airplane Washing Using Water Jet, CFD Simulation ANSYS Fluent Training

\$210.00 Student Discount

This project was performed to simulate aircraft washing using a water jet by ANSYS Fluent software.

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## Airplane washing Introduction

Airplane fuselages become contaminated over time due to high-velocity motion, including insect carcasses and bird droppings that combine with engine exhaust to create a carcinogenic layer of contaminant on the fuselage. ThisÂ  Airplane washing is done several times during the year. Airplane windows are also sensitive parts that can be easily scratched, and it is best to cover these parts before starting the washing process.

## Â Problem Description

This project was performed to simulate aircraft washing using ANSYS Fluent software. The computational domain of a cube with dimensions of 46 x 8.5 x 17, in which a separate part is provided to move the sub-domain of the aircraft using the sliding mesh model. Water enters the computational domain through holes in the bottom of the slope at a speed of 15 meters per second and air in the opposite direction of the plane at a speed of 2 meters per second from the opposite side to model more realistic conditions.

## Geometry & Mesh

The computational domain was designed using Design Modeler software. The computational domain includes a 46 x 8.5 x 17 m cube. The domain in which the plane was located and moving a cube with a cross-section of 13.5 x 3 meters.

ANSYS Meshing software was used for grid generation, and the type of problem elements was unstructured. Also, the total number of elements was about 4560000.

## Solver Setting

In this simulation, the following hypotheses are established:

• A pressure solver was used.
• The problem was solved transient.
• The gravitational effect was considered.

Also, the table below shows the characteristics and values of boundary conditions, along with the models and hypotheses.

 Material Properties Water Amount Fluid properties 998.2 Density (kg/m3) Air Amount Fluid properties 1.225 Density (kg/m3) Multiphase Homogeneous model VOF (volume of fluid) Number of Eulerian phases 2 (water-air) Interface modeling sharp Formulation Explicit Air-water surface tension coefficient 0.072 N/m Boundary Condition Type Velocity inlet Water inlet 15 m/s Air inlet 2 m/s Type Outlet Outlet Â Gauge pressure zero Cell zone condition Fluid mixture Mesh motion Moving zone Translational velocity = 1 m/s Turbulence models K-e Â viscous model Realizable K-e model Standard wall function Wall function Solution methods Simple pressure velocity coupling Spatial discretization PRESTO pressure Second-order upwind momentum Modified HRIC Volume fraction First-order upwind turbulent kinetic energy First-order upwind Â Â Â Â  turbulent dissipation rate Initialization (Hybrid)

## Results

In this section, volume fraction and velocity counters are placed in a longitudinal section of the computational range. Observing these images, it is clear that the amount of air injection into the domain increases over time, and when the aircraft reaches that part, the washing process is performed.

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