Computational Fluid Dynamics - CFD

Airflow behaviour is difficult and complicated to predict. Accurate calculation is paramount in order to create an effective car park ventilation system. Fläkt Woods modelling is backed up with both lab test research and smoke tests in real car parks to insure accuracy.   Manual calculation methods, used by many, are extremely limited in their ability. Manual calculation is usually inaccurate and imprecise, which is why Fläkt Woods offers full CFD analysis to customers on all projects.
	Fläkt Woods CFD Engineers are highly trained and experienced, using their knowledge and expertise to design number and positioning of Jet Thrust Fans. Design is verified by using industry recognised, highly accurate, CFD modelling software, and adjusted and recalculated if required.
How it Works: The CFD program comprises of a solver, which integrates the relevant differential conservation equations (Mass, Linear Momentum and Energy). The software program solves these algebraic equations for a finite number of iterations until an acceptable level of accuracy has been obtained, allowing accurate car park design.   CFD software allows the creation of visualisation planes, which intersect points of interest in the model, where contours and vectors of any stored variable, such as air speed, pressure, velocity etc., can be displayed.   Particle sources can be attached to surfaces within the model or positioned within free space if desired. Particles are then released allowing a visualisation of general airflow movement through the car park.   A range of parameters is considered in the analysis, including air speed and velocity, air quality and overall distribution of the airflow.

Process Stages:

1. A computer model of the layout of the car park is created. 3-D plots are sent to the customer for approval.

2. Once approved, the design layout of the car park and model geometry will be frozen, and detailed analysis undertaken.

3. The model is run with only the main extract fans operating. This identifies the main bulk airflow paths from the supply to the extract points and any areas of re-circulation within the car park.