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Wind Tunnel CFD Simulation, Compressible Flow

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In this project, a compressible airflow in a wind tunnel is simulated.

 

This ANSYS Fluent project includes CFD simulation files and a training movie.

There are some free products to check the service quality.

To order your ANSYS Fluent project (CFD simulation and training), contact our experts via info@mr-cfd.com, online support, and WhatsApp.

Description

Introduction

The wind tunnel is one of the most widely used aerodynamic testing devices today. Among the many experiments that can be performed in wind tunnels, we can mention the testing of various structures, including various types of airfoils, planes, static structures, etc. The purpose of these experiments is usually to investigate the aerodynamic conditions and visibility of the flow lines.

The free fall test can also be performed in a tunnel to examine the effects of airflow on a falling object. Due to the importance of the effects of the forces, including drag, on the body, the calculation of these forces is important, which can be calculated with the help of CFD.

Project Description

In this project, a wind tunnel and a specific body that is placed inside it, are modeled. The effect of drag force on this body is investigated. The energy model and standard k-epsilon model with the use of standard wall functions are activated.

Geometry and Mesh

Geometry is designed in ANSYS design modeler® and is meshed in ANSYS meshing®. The mesh type is unstructured and the total element number is 179542.

wind tunnel wind tunnel

Wind tunnel CFD simulation settings

The assumptions considered in this project are:

  • Simulation is done using a density-based solver due to changes in Mach number.
  • The present simulation and its results are considered to be steady and do not change as a function time.
  • The effect of gravity has not been taken into account.

The applied settings are recapitulated in the following table.

 
(wind tunnel) Models
Viscous model k-epsilon
k-epsilon model standard
near-wall treatment standard wall function
Energy On
(wind tunnel) Boundary conditions
Inlets Pressure far field
Mach number 0.15, 0.186, 0.2
Turbulent intensity 5%
Turb. Vic. ratio 10
Outlets (wind tunnel) Pressure far field
Mach number 0.15, 0.186, 0.2
Turbulent intensity 5%
Turb. Vic. ratio 10
Walls
wall motion stationary wall
Heat flux 0 W/m2
(wind tunnel) Solution Methods
Formulation Implicit
Flux type Roe-FDS
 

Spatial discretization

Flow second-order upwind
turbulent kinetic energy first-order upwind
turbulent dissipation rate first-order upwind
(wind tunnel) Initialization
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y,z) (0, 52.06315,0) m/s-1
Turbulent kinetic energy 10.16464 m2/s2
Turbulent dissipation rate 61147.06 m2/s3
Temperature 300 K

Wind Tunnel Results

We obtain the contours of velocity, pressure, temperature, etc. for different inlet Mach numbers at the end of the solution.

 

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

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