LIET

Images: 3D printed model and surroundings. Close-up of building modelwith view of tubingStereo PIV measurement planes and 1:350 scale simulated flow field streamlines around a cubic building exposed to an atmospheric boundary layer in a Wind tunnel

Building geometry and surroundings' topography was provided by the designing engineers (DENCO) and a 1:350 model of the new building design was constructed using 3D printing technology, along with the main buildings within a 350 m radius around it (CNC cutting). The atmospheric boundary layer was simulated via passive elements and over 350 pressure tap routes were printed through the model to be connected via tubing with pressure recording equipment. Measurements provided mean, variance and maximum values of pressure on the outer building surfaces, in order to design cladding
Special thanks to our collaborators on the model construction: GET3D and BELLOS

Images: Initial architectural design, wind flow paths in final design and improved wind comfort zones (blue - comfortable, red - uncomfortable) from CFD calculations

An in-house CFD methodology was implemented to study wind flow through and around the SantAnna beach bar facility in Mykonos. The CFD studied geometry was built from the original architectural design files and awnings, vegetation and walls were optimally positioned for wind comfort, unobtrusiveness and design. Close collaboration with the architectural team (ASPA) lead to a successful final design.

Images: Stereo PIV measurement planes and 1:350 scale simulated flow field streamlines around a cubic building exposed to an atmospheric boundary layer in a Wind tunnel

Simulation of atmospheric boundary layer mean flow and turbulence is performed in the NTUA wind tunnel in order to study building specific information related to air quality, energy applications etc

To access the wind tunnel data please click here

Images: 3D reconstruction of urban area in Kozani Greece and CFD study using meso-scale generated boundary conditions

Development and evaluation of a high resolution atmospheric urban canopy model for energy applications in structured areas (2013-2015). Ministry of Education and E.U., “Archimides III”

Numerical Weather Forecasting is coupled with urban scale CFD modelling in order to provide detailed, building specific information for energy applications such as building energy consumption calculations, wind and solar energy etc.

Images: Vorticity contours and particle positions in two heat exchanger arrangements - conventional and different tube diameter (CFD study)

Project: “Study of heat exchanger fouling for fouling reduction and heat transfer optimisation” (2005-2006). Funded by the Region of Western Macedonia, Greece.

A novel heat exchanger configuration was developed and tested through laboratory experiments and CFD modelling. Heat exchanger fouling was reduced by ~30% with a ~30% enhancement of heating power density (q/V) and a negligible pressure drop penalty.

Image: Visualisation of flow and temperature field for heat transfer study of 10 ppi metal foam (left) and flow field in PEM GDL with carbon cloth (right)  (CFD studies)

Numerical Investigation of Flow Field and Heat Transfer at the Microscale of Porous Materials. (2005-2008). PENED 2003. Funded by GSRT, EU and Fluid Research Co. 

A 3D numerical simulation methodology for the flow and heat transfer at the pore scale level of high porosity open cell metal foam was performed and the conjugate flow and temperature fields were obtained for two different foam pore densities. Furthermore, the same methodology was applied to a 3D reconstruction of the pore scale geometry of a portion of the PEM cathode channel and carbon cloth GDL. Local heat and fluid flow at the GDL’s pore scale was calculated and their effects on condensation of water vapour that leads to flooding was studied.

Images (from left): CFD calculations of diurnal flow and temperature field around building surfaces in Piraeus, Greece; large eddy simulation of oblique flow past a cuboid building; flow and heat transfer through an urban area (Piraeus)

Project:  “Flow and Heat Transfer Simulation in the Unified Indoor and Outdoor Environment of Buildings” (2005-2006). Funded by the Greek Ministry of Education and the E.U. 

A number of studies have been performed during the development of a multi-local refinement CFD methodology for prediction of flow and heat transfer in urban areas. Urban geometry is reconstructed from GIS information, a simplified solar radiation model is implemented and numerical weather forecast models are used for boundary conditions at the specified location.