Providing airplane passengers with an adequate comfort level is a critical design objective for airplane manufacturers of all sizes. Cabin cool-down and warm-up times are not only key design requirements, but are often regulated and part of the certification process. Thermal comfort of passengers should be assured in a wide range of climatic and operating conditions, evenly throughout the entire aircraft cabin.
Cabin comfort assessment traditionally depends heavily on testing physical prototypes. Physical testing is very expensive, time-consuming, and inflexible. Solar radiation is a critical component that can be reproduced only to a limited degree in climatic wind tunnels. Measuring surface and fluid temperatures is not sufficient. Passenger comfort is a complex physiological function of temperature, heat transfer rates, air velocity, clothing, body type, body mass, and other factors. With physical testing, such evaluations are very subjective.
Exa's solutions are ideally suited to address cabin comfort issues. PowerFLOW's unique, inherently transient Lattice Boltzmann-based physics enables it to perform simulations that accurately predict real-world transient conditions on the most complex geometry. The resolution of large scale turbulence provides an accurate prediction of the heat transfer coefficients. PowerTHERM is a fully coupled, highly accurate, transient, conduction and radiation solver. PowerTHERM has sophisticated capabilities for modeling solar radiation and a best-in-class, proprietary, human comfort physiological model. The combination of PowerFLOW and PowerTHERM enables you to accurately predict cabin air temperature over long time periods, calculate heat-up and cool-down times, and visualize the flow and temperature fields for the entire cabin. This enables you to not only identify problem areas, but provide design recommendations that eliminate problems early in the design cycle. Rapid turnaround times for model setup, simulation, visualization, and design modification enable you to quickly make design changes to the baseline and evaluate the improvements in cabin comfort.
EXA SOFTWARE USED FOR THIS APPLICATION