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Computational Fluid Dynamics is a very relevant root from Fluid Mechanics where most of the real analysis and simulation takes place for a large variety of applications, from automotive industry in normal and racing cars to aircrafts and rockets.
CFD allows the analysis of a fluid problem and helps understand the main forces around a body in order to determine the most efficient solution and design to reduce drag coefficient or structural stresses.
The goal of this project is to have a basic understanding by a on overview of CFD in Ansys Fluent
Incompressible Case Study
Incompressible Case Study
A case study was performed to have a guidance along the software and understand the basic problem structure and the data needed to solve it.
An ogive was considered for the study, moving at 30 m/s in the x direction and has a total surface like the one shown in the picture.
Mesh Module
Mesh Module
As it has been discussed in many projects, when it comes to simulation, one of the most important steps in the process is the meshing. A good mesh will determine the accuracy and precision of the simulation and the data extracted so it's very important to stablish a proper cell size when it comes to meshing.
To mesh in fluent the module Mesh is the one that applies it all. It's interesting that in order to gain computational efficiency, the critical points must be well meshed but the zones where not much is going to happen can remain with a bigger cell sizing.
This is exactly what happens in the figure, the y and x axis are going to be the relevant areas in the simulation, the rest will consider a bigger mesh since the aerodynamic perturbations won't reach these areas.
Graphic Results
Graphic Results
The software allows the analysis of the different parameters involved in the simulation through the Fluent module. The graphs below show the drag coefficient for different number of iterations, the pressure coefficient along the body and the residuals from the simulation
Other Simulations
Other Simulations
Besides the graphical results, another type of simulation can be performed through the software to visualize the stresses and different parameter interactions along the body.
The pressure and velocity profiles are shown below along with the streamlines around the body.
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