'HPAC webinar - Ventilation of a theater space' simulation project by sjesu_rajendra


#1

I created a new simulation project called 'HPAC webinar - Ventilation of a theater space':

Analyse the duct positioning to have effective ventilation system


More of my public projects can be found here.


#2

Description


 
Watching movies has always been a relaxing experience for the young and the old. To make the viewing experience as immersive as possible, it is paramount to ensure the physical comfort of the viewer at all points of time. The entire process of entering the theatre, easily finding one’s seat, comfortable seating, and thermal comfort should be borne in mind while designing a theatre.
 
In association with HPAC (Heating Plumbing and Air Conditioning) magazine, SimScale conducted a workshop enquiring into the thermal comfort of a radial fan. To gain a better perspective, we conducted a CFD analysis of the airflow inside the theatre. This analysis gives us a good insight into the ventilation in addition to the thermal comfort at different spots in the theatre.
 

Project Goals


 
With the ultimate aim of arriving onto a better design, the current project uses the SimScale platform to simulate the airflow inside a theatre space.
 
To draw a comparison, two different configurations of inlet ducts are studied.
 
a. Configuration 1 - Ducts directed to the sides
 
b. Configuration 2 - Ducts directed to the top
 
Based on factors such as the uniformity of temperature distribution, areas of recirculation etc., we shall decide the configuration that helps achieve greater thermal comfort.
 

Geometry


 
The geometry for this project was created on OnShape (Credits: Ali Arafat @Ali_Arafat). The geometry is constructed and imported onto the SimScale platform.
 
image
 
Imported Geometry of Theatre
 
The two configurations described in the Project Goals are accurately represented by the images shown below:
 




Configuration 1 and 2

Meshes


A Hex-dominant parametric (only CFD) mesh is mapped onto both the geometries with 16 computing cores and 5 mesh refinements.
 
image
 
Mesh on configuration 1
 
image
 
Mesh on Configuration 2
 

Simulations


 
A Steady State Convective Heat Transfer Analysis with a turbulence model of k-omega SST is employed for simulating both the configurations.
 
The entry of the duct is treated as the Inlet and the and the central exit is assigned to be the Outlet. All the other surfaces in the theatre are treated as walls.
 
Due to the large geometry and several heavy mesh refinements, each simulation run takes approximately 9 hours to run.
 

Results and Conclusions


 
The following image shows the velocity slices across the space of the theatre for configuration 1 and 2 respectively.
 


 
The images below gives the EDT (slice across the section and as threshold) values in the domain. The inputs for EDT and ADPI calculation can be found under this link.
 

 
Case 1 - EDT threshold between -3 and 2 [ADPI: 0.606]
 

 
Case 2 - EDT threshold between -3 and 2 [ADPI: 0.586]