In a occupied enclosure space formed by multiple opposed jet outlets

understanding the vortex structures plays a crucial role in controlling the spread of viruses and pollutants. This study constructed a scaled model of a occupied enclosure space with opposing jet flows

incorporating a heated floor as a heat source to create thermal plumes under cooling conditions. Particle Image Velocimetry (PIV) system was employed to measure the flow field under isothermal and cooling conditions. Studying the Turbulent Characteristics of the Flow Field from the Vortex Perspective

comparing the identification performance of different vortex identification algorithms. The Liutex vortex identification method was applied to analyze the vortex motion within one oscillation period

revealing distinct strengths in counterclockwise and clockwise directions

with maximum intensities of 50 and 110 s?1

respectively. The study concluded that the motion

merging

and annihilation of vortices influence the flow field structure

with a jet oscillation period of approximately 3.67 seconds. Due to the trapping effect of vortexes on pol-lutants

areas of pollutant accumulation can be represented through the vortex core relative frequency distribution maps. It is observed that

despite the flow field being unsteady

the distribution of vortexes remains relatively stable. Specifically

on the left side of the CS4 cross-section

the vortex core appeared at the same point up to 21 times. Under cooling con-ditions

pollutants are confined to smaller regions

which aids in containing the spread of pollutants.