Question

What is CFD and how can it be used in the study of thermal comfort ?

”Not very long answers, and don’t write for hand Plz”

Answer 1

Computational Fluid dynamics (CFD) is a analysis of various phenomena involving fluid flow,heat transfer using computer based simulation. This technique is very widely used nowadays.  

Thermal comfort :- Here CFD is a very good tool for analysing the design of a building before building it.  The Computational Fluid Dynamics represents the combination of the modern fluid dynamics, numerical mathematics and computer science. By employing CFD wind environment simulation technology, the architects are able to accurately project and intuitively describe the building wind environment of a design proposal, conduct analysis in combination with knowledge in building technology science and the simulation results, and analyze the strength and weakness of various design options and accordingly revise the architectural design. Natural ventilation is crucial for conserving the energy, reducing carbon emission, and improving the comfort level of the built
environment and the indoor air quality. CFD simulations are developed to analyze the wind environment of a project site, including prevailing wind directions and strengths in winter and summer, wind field changes resulting from surrounding buildings or structures, orographic lifts generated in certain terrains, so as to find out if unmoving air mass or excessively high wind speed will occur in a certain terrain or surrounding.In site planning, buildings can then be reasonably positioned based on the analysis result of the wind environment,while other factors such as daylighting, noise, building coverage, height, orientation, spacing and configuration are addressed as well.
Modern wind towers can be retrofitted into the designs of new buildings to provide natural ventilation and thermal comfort without the use of electrical energy.