Conventional CFD analysis
WWTF staff have applied CFD to a number of wind engineering projects
for both consulting and research. This work has been conducted
in collaboration with government and private organizations
and other research institutions in Hong Kong. Typical examples
of these applications include the following:
Advanced CFD analysis
With a dedicated and ongoing mission to conduct wind engineering
research, WWTF’s CFD capabilities are used to transfer
and implement the latest research and development results directly
to practical wind engineering problems. This is achieved through
the use of the following software.
FLUENT
FLUENT is a standard CFD package that has been used by many research
and consulting companies for analyzing environmental fluid
flows. FLUENT software allows the use of a wide range of turbulence
models including large eddy simulations (LES), detached eddy
simulations (DES), Reynolds averaged Navier-Stokes (RANS) and
Reynolds Stress Turbulence models (RSTM).
OpenFOAM
OpenFOAM is an open source software that allows implementation
of the latest research results from scientific literature.
These include the latest turbulence models that may be unavailable
in traditional CFD packages. An example of this saw the development
of a new method to calculate pressure fluctuations based on
RANS model simulations. This has the advantage of requiring
lower computational resources than LES while still providing
the necessary time varying information to determine the unsteady
pressure fluctuations.
High Quality Results
WWTF recognizes the importance of proper verification and validation
of all model studies, be it physical modeling or computational
modeling, to ensure the accuracy and applicability of the study
results. For CFD studies, all simulations are conducted according
to the following guidelines and references:
-
AIJ guide for numerical prediction of the
wind loads on buildings (2008), Tamura et al., Journal of Wind
Engineering and Industrial Aerodynamics, Volume 96, page 1974-1984.
-
COST (European Cooperation in the field
of Scientific and Technical Research) group: Action C14 “Impact of Wind and
Storms on City Life and Built Environment” Working Group
2-CFD techniques (2004).
-
COST (European Cooperation in the field
of Scientific and Technical Research) group: Action C732 “Best practice guideline
for the CFD simulation of flows in the urban environment” Working
Group 2-CFD techniques (2007).
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