Mountain External Airflow CFD Simulation, ANSYS Fluent Training

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The purpose of this project is to study the airflow and heat transfer on the surface of the mountain.

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

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Project Description

The study of natural phenomena has always been of interest to researchers. The purpose of this project is to study the airflow and its heat transfer on the surface of the mountain that it encounters in the passage, which is also effective in determining the air passage for the aircraft.

In this project, the air enters the computational domain with the velocity and temperature of 8 m/s and 297.5 K, respectively. The energy model is activated. Due to the nature of the flow, which is of the external flow type, and considering the airflow velocity, which has consequences such as flow separation, and vortexes behind the mountain, the K-epsilon Standard model has been used to analyze the turbulent flow.

Mountain Geometry and Mesh

The geometry of this model is designed in ANSYS design modeler® and is meshed in ANSYS meshing®. The computational domain consists of an airflow inlet, the mountain itself and 3 different pressure-outlets (including top and side walls), and the main outlet. The mesh type used for this geometry is unstructured and the element number is 1250044.

mountain mountain

External Airflow around a Mountain CFD Simulation

The key assumptions considered in this project are:

  • Simulation is done using pressure-based solver.
  • The present simulation and its results are transient. 16 time steps with a step size of 7 seconds are exploited for this simulation.
  • The effect of gravity has not been taken into account.

The applied settings are summarized in the following table.

(mountain) Models
Viscous model k-epsilon
k-epsilon model standard
near wall treatment standard wall function
Energy On
(mountain) Boundary conditions
Inlets Velocity inlet
Velocity 8 m/s
temperature 297.5 K
turbulent Intensity 5 %
Turbulent Viscosity Ratio 10
Outlets Pressure outlet
Gauge pressure 0 Pa
Backflow temperature 297.5 K
Backflow turb. Intensity 5 %
Backflow turb. Visc. Ratio 10
Walls wall motion stationary wall
Mountain surface Temperature 300 K
Bottom surface Heat flux 0 W/m2
(mountain) Solution Methods
Pressure-velocity coupling Simple
Spatial discretization pressure Second order
momentum second order upwind
energy second order upwind
Turbulent kinetic energy First order upwind
Turbulent dissipation rate First order upwind
(mountain) Initialization
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y,z) (0,8,0) m/s
Turbulent kinetic energy 0.24 m2/s2
Turbulent dissipation rate 35.48899 m2/s3
Temperature 300 K


Contours of pressure, velocity, temperature, streamlines and velocity vectors are presented.

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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