Double Skin Façade CFD Simulation by ANSYS Fluent Training

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The present problem simulates the air flow inside the interior of the double skin facade of buildings using ANSYS Fluent software.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Project Description

The present problem simulates the air flow inside the interior of the double skin facade of buildings using ANSYS Fluent software. In double skin facades, the collected air uses heating received from sunlight and move upward due to the effect of buoyancy, causes heating and cooling inside the buildings. The purpose of this work is to investigate the effect of buoyancy on the behavior of heated air inside the interior of a double skin facade. The interior of this facade consists of a glass part as a source of receiving heat from the sun and a duct-shaped part for air flow. Therefore, it is assumed that the glass part of the model has a constant amount of heat generation equal to 6940 W.m-3.

The walls of the buildings are made of brick and have a thermal boundary condition of Convection; Thus, the air temperature inside the buildings is equal to 300 K and the heat transfer coefficient is equal to 23 W.m-2.K-1. The inlet air flow to this double skin facade has a temperature equal to 304.55 K and a pressure equal to atmospheric pressure. Also, to study the buoyancy effect, the air density is defined as ideal gas and the gravitational force equal to 9.81 m.s-1 is defined on the model.

double skin facade

Geometry & Mesh

The present model is designed in three dimensions using Design Modeler software. The geometry of the model is related to the double skin facade with dimensions of 0.6 m * 3.2 m * 5 m in the shape of a rectangular cube, which consists of a duct section for air flow and a glass section for receiving solar radiation heat. A rectangular inlet valve (0.2 m) is located at the bottom of the glass wall and a rectangular outlet valve (0.2 m) is located above the glass wall.

double skin facade

The meshing of the model has been done using ANSYS Meshing software, and the mesh type is unstructured. The element number is 490725. The following figure shows the mesh.

double skin facade

Double Skin Facade CFD Simulation

We consider several assumptions to simulate the present model:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is equal to -9.81 m.s-2 along the Z-axis.

The following table represents a summary of the defining steps of the problem and its solution:

Viscous k-epsilon
k-epsilon model realizable
near-wall treatment standard wall function
Boundary conditions
Inlet Pressure Inlet
gauge pressure 0 Pascal
temperature 304.55 K
Outlet Pressure Outlet
gauge pressure 0 Pascal
Walls of Duct Wall
wall motion stationary wall
thermal condition convection
free stream temperature 300 K
heat transfer coefficient 23 W.m-2.K-1
Pressure-velocity coupling Simple
pressure second order
density second order
momentum second order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
energy second order upwind
Initialization methods Standard
gauge pressure 0 Pascal
velocity 0 m.s-1
temperature 300 K


At the end of the solution process, two-dimensional and three-dimensional contours related to pressure, velocity and temperature, as well as two-dimensional and three-dimensional velocity vectors are obtained. As can be seen from the behavior of velocity vectors, the air flow inside the chamber moves upwards, which indicates the occurrence of the buoyancy effect for the ventilation system.

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, the Training File presents how to solve the problem and extract all desired results.


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