Compressible Flow around an Aerial Structure, CFD Simulation
The present problem simulates compressible flow around an aerial structure using ANSYS Fluent software.
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The present problem simulates compressible flow around an aerial structure using ANSYS Fluent software. A density-based approach has been used to define the type of airflow solution around this aerial structure; Because the existing airflow is entirely compressible. Density-based solution perspectives are commonly used to simulate models such as acoustic waves, shock wave phenomena, airfoils in ultrasonic waves, and any model in which density changes are significant. In this model, a rectangular cube computational area around an aerial structure is designed; So that all its side walls have a pressure far-field boundary condition.
The airflow moves horizontally with a temperature equal to 300 K and Mach number equal to 5 and at a pressure equal to atmospheric pressure in this computational area. The Mach number is equivalent to the ratio of the velocity of an object in a fluid to the ratio of the velocity of sound in the same fluid in which that object moves. For example, the speed of sound in the air with a temperature of 25 ° C is 343 m.s-1. Also, the airflow in the model is defined as an ideal gas; That is, density changes are a function of changes in pressure, velocity, and temperature, according to the ideal gas relationship. (Compressible Flow)
Aerial Structure Geometry & Mesh
The present model is designed in three dimensions using Design Modeler software. The model includes an aerial structure located inside the air stream; So that the airflow as a computational area has the shape of a rectangular cube. Due to the perfectly symmetrical structure of the geometric model, only half of the geometric model is designed, and the symmetry condition is used for the symmetry plane of the model.
We carry out the model’s meshing using ANSYS Meshing software, and the mesh type is unstructured. The element number is 5515041. The following figure shows the mesh.
Compressible Flow CFD Simulation
We consider several assumptions to simulate the present model:
- We perform a density-based solver.
- The simulation is unsteady.
- The gravity effect on the fluid is ignored.
The following table represents a summary of the defining steps of the problem and its solution:
|Models (Compressible Flow)
|Viscous||Large Eddy Simulation (LES)|
|Boundary conditions (Compressible Flow)
|gauge pressure||0 Pascal|
|wall motion||stationary wall|
|heat flux||0 W.m-2|
|Methods (Compressible Flow)
|flow||second order upwind|
|Initialization (Compressible Flow)
|gauge pressure||0 Pascal|
|y-velocity & z-velocity||0 m.s-1|
Results & Discussions
At the end of the solution process, two-dimensional contours related to pressure, velocity, temperature, density, and Mach number are obtained. The results show the compressibility of the air flow around the aerial structure; the density of the airflow around the air body changes significantly. This is due to changes in pressure and velocity in the areas around the airspace.
There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.