Internal Airflow of Atrium CFD Simulation, ANSYS Fluent Training

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This problem simulates the internal airflow inside an atrium located in a complex.

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

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Project Description

This problem simulates the internal airflow inside an atrium located in a complex by ANSYS Fluent software. The history of the atrium originates from the architecture of ancient Roman houses, and its modern models in recent centuries are multi-story and have a glass roof and a set of windows that usually are located immediately after the main entrances of the buildings. This part of the building is used to provide the necessary light for the interior of the building as well as building ventilation.

Atrium works with two natural phenomena, including the greenhouse effect and the chimney effect. In the present case, the cylindrical area called the atrium in the central part of a complex is considered; So that the airflow at the velocity of 2 m.s-1 and the pressure of 101325 Pa enters the complex from the lower entrance, and enters the interior space of the atrium from the upper entrance.

The purpose of this project is to investigate the behavior of airflow inside the atrium, and also study the pressure and velocity distribution of the internal flow inside the atrium.

Geometry & Mesh

The present model is drawn in three dimensions using the ِ Design Modeler software. The present model consists of a building area of a large complex with a cylindrical space called atrium inside the complex. The figure below shows a view of the geometry.

internal flow

The meshing of this model has been done using ANSYS Meshing software. The mesh type is unstructured and the number is 2496105. The cells adjacent to the internal boundaries are smaller and more accurate. The figure below shows a view of the mesh.

internal flow

Internal Flow CFD Simulation

To simulate the present model, several assumptions are considered:

  • The solver is Pressure-based.
  • The simulation is steady-state.
  • The effect of gravity on the fluid is not considered.

A summary of the steps for defining a problem and defining its solution is given in the following table:

(internal flow) Models
Viscous model k-epsilon
k-epsilon model realizable
near-wall treatment standard wall function
(internal flow) Boundary conditions
Inlet & atrium inlet Velocity inlet
velocity magnitude 2 m.s-1
Outlet & atrium outlet Pressure outlet
gauge pressure 0 Pascal
Sidewalls and building Wall
wall motion stationary wall
(internal flow) Solution Methods
Pressure-velocity coupling   SIMPLE
Spatial discretization pressure second-order
momentum second-order upwind
turbulent kinetic energy first-order upwind
turbulent dissipation rate first-order upwind
(internal flow) Initialization
Initialization method   Standard
gauge pressure 0 pascal
z-velocity 2 m.s-1
x-velocity, y-velocity 0 m.s-1

Results of Internal Airflow in an Atrium

After the solution process is complete, two-dimensional, and three-dimensional contours related to pressure, velocity, as well as pathlines and velocity vectors are obtained.

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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