Internal Airflow Inside an Atrium Building CFD Simulation
This problem simulates the internal airflow inside an atrium located in a complex.
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This problem simulates the internal airflow inside an atrium located in a complex. 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.
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 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:
|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|
|turbulent kinetic energy||first-order upwind|
|turbulent dissipation rate||first-order upwind|
|gauge pressure||0 pascal|
|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.
There is a mesh file in this product. By the way, the Training File presents how to solve the problem and extract all desired results.