Radiation Effect on a Dome-Shaped building, ANSYS Fluent CFD Training
The present problem simulates the heat transfer inside the interior of a mosque considering radiation.
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Radiation Project Description
The present problem simulates the heat transfer inside a mosque by ANSYS Fluent software. In the present case, it is assumed that heat transfer takes place in two modes of convection and radiation. In fact, the building’s indoor heating source is powered by solar energy and a heat source used on the ground floor of the mosque. The heat transfer between the sidewalls of the mosque, the roof of the mosque and its dome is done with the free airflow of the surrounding environment with a temperature of 309 K and the heat transfer coefficient of 10 W.m-2.K-1.
Radiant heat transfer is also carried out on the sidewalls, roof, and dome of the mosque due to the radiation of sunlight and assuming an absorption coefficient of 0.8 for the surfaces. Therefore, the radiation model is used to simulate the present problem. Since it is assumed that the material of the mosque building and the glass used on it has a high absorption coefficient, the Rosseland method is suitable. The solar load model has also been used to apply the effect of solar radiation. Also, the heat source used in the floor of the mosque, in the amount of 30 W.m-2, applies a thermal heat flux to the floor of the mosque, assuming a thickness of 20 cm for the floor.
Since the main purpose of the issue is to investigate the heat transfer within the mosque, there is no need for inlet and outlet boundary conditions.
Geometry & Mesh
The geometry of the present model is three-dimensional and has been designed using Design Modeler software. Model geometry has a simple structure. The mosque building consists of a dome, sidewalls, floor, roof, and several interior columns. Here is the geometry of the building.
We do the meshing of the present model by ANSYS Meshing software. The mesh type is unstructured and the element number is 674066. The following figure shows a view of the meshing.
We assume several assumptions for the present simulation:
- The solver is Pressure-Based.
- Simulation has investigated both fluid behavior and heat transfer.
- The simulation is Steady-State.
- The effect of the gravity on the model is equal to -9.81 m.s-2 along the Z-axis.
Radiation CFD Simulation
The following is a summary of the steps for defining a problem and its solution:
|standard wall function||near wall treatment|
|solar ray tracing||solar load model|
|Boundary conditions (Radiation)|
|30 W.m-2||heat flux|
|Wall||Roof, dome and side walls|
|309 K||free stream temperature||convection|
|10 W.m-2.K-1||heat transfer coefficient|
|Solution Methods (Radiation)|
|second order||pressure||Spatial discretization|
|second order upwind||momentum|
|second order upwind||energy|
|first order upwind||turbulent kinetic energy|
|first order upwind||turbulent dissipation rate|
|second order upwind||density|
After the solution process, two-dimensional and three-dimensional contours related to temperature, pressure, velocity, as well as two-dimensional and three-dimensional velocity vectors were obtained. The two-dimensional contours are drawn in two sections, YZ, and XZ, passing through the center of the mosque building.
You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.