Ventilation CFD

Ventilation CFD (Computational Fluid Dynamics)

Ventilation CFD is one of the core services that we perform at our Singapore offices in BroadTech Engineering.

Types of Ventilation CFD Simulation We Do

1. Tunnel ventilation CFD analysis

2. Carpark ventilation CFD analysis

3. Basement ventilation CFD analysis

4. Smoke ventilation CFD analysis

5. Building Natural ventilation CFD analysis

Featured Ventilation CFD Case Studies

Natural Airflow Ventilation CFD Modeling & Simulation over Metropolitan City

The objective was to model and visualize the natural ventilation on specific parts and regions of the city.
For the computational fluid dynamic modeling, we carefully considered whole city CAD, meshed with snappyhex mesher and solved in OpenFOAM using realizable K-epsilon turbulence model.
The simulation results of the fluid flow distributions were in close agreement with the commercial code results.

Analyze Air Pressure Distribution in Clean room

As clean room in electronic plant needs to have 5Pa of Gage pressure to preserve the sensitive product, I simulated the airflow in the building interior with CFD. I model a building according to exact dimension and layout, open all the section door, and project air flow from the blower. The outlet was the air ventilation holes. The simulation was run for 300 iterations until the convergence was achieved.
The results were the outlet speed of air, the minimum gauge pressure, and the average gage pressure.

Natural Airflow Ventilation Modeling & Simulation

Smoke extraction CFD study for the underground of the HL-LHC premises
The premises is 343 m long tunnel underground at a depth of 60 m from the ground level. The tunnel is divided into separate compartment supported by AHU units. It also equipped with Fire resistance doors, smoke curtains, smoke dampers along with other equipment for the experiment. The tunnel also has the horizontal corridors of 50 m in length at 3 different locations. The tunnel is not ventilated. It has a smoke extraction duct which flows through the vertical column till the horizontal corridor.

Objective: The objective is to design a fan at the inlet of the smoke extraction duct so that it can extract smoke at the farthest location in the tunnel.

Methodology: Geometry Cleanup and Approximation: Approximation is made the represents the real blockage of the tunnel with cubical shape box placed at the various location.

Meshing: SnappyHexMesh is used to generate the mesh with a proper interface of the smoke duct and other solid materials.

CFD Modeling: Fire Source in the corridor to generate smoke (solid fuel)

Solid fuel pyrolysis model is considered.

Fan boundary condition is used to predict the pressure drop across the corridor and the smoke extraction duct. Design optimization iteration was performed to finalize the design.

Ceiling Fan Simulation (Industrial project)

Ceiling fans are frequently used in tropical areas of the world for low-cost indoor comfort. An incremental work in improving the energy efficiency of ceiling fans can directly reflect in substantial energy conservation across buildings in Singapore.

In this simulation project, computational modeling and simulation of the ceiling fan rotating inside the room is performed. The computational model is validated by the experimental data collected from an actual physical test performed.

A parametric study of ceiling fans is carried out with the objective to improve flow field variables and fan efficiency. The performance indicators such as velocity profile, mass flow rate, torque, rated air delivery and service value are calculated. Different cases of rake angles are considered and compared to the baseline geometry.

The study concluded that six-degree rake angle to show enhanced performance.

Natural Airflow Ventilation Modeling & Simulation

Objective: Simulate free jet flow and check effects of Reynolds number and Grashof number

Methodology:

– A Matlab program has been written to solve continuity, momentum and energy equations simultaneously due buoyancy term present into momentum equation

– Crank-Nicolson implicit scheme used for marching in X direction

– Free jet flow condition: T = 285 K, U = 2 m/s

– Ambient conditions: T=283 K, U = 0 m/s

– Jet width = 1 mm

Case1: Gr=0.0441, Re=88

Case2: Gr=0.1515, Re=220

Case3: Gr=0.1515, Re=132

Case4: Gr=0.0441, Re=220

Outcome & Conclusion:

– Visualised temperature and velocity distribution

– Downstream variation of dimensionless centerline velocity and temperature plotted

– It has been validated that for same Grashof number, natural flow stream height increases with Reynolds number

– It has been validated that for same Reynold number, natural flow stream height increases with Grashof number.

Overview

1. FEA Consulting

2. CFD Consulting

3. LS-DYNA Consulting

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Customers will be provided with fully tailored CFD reports which detail the Methodology, in-depth analysis, and recommendations.
This insight allows our clients to optimize performance and make informed engineering decisions in a scientific, proven manner.

If you are still interested in learning more about ventilation CFD and to see what it can do for you, simply call to contact us now at +6581822236 for a no obligation discussion of your needs.
Our knowledgeable and friendly consultants will be happy to answer any of your queries and explain to you in details the benefits & features of doing a ventilation CFD on your building layout design.

Alternatively, for quote request, simply email us your technical specifications & requirements to info@broadtechengineering.com