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A numerical investigation of wind environment around a walking human body
AbstractHuman-induced wake flow characteristics and its interaction with thermal conditions was investigated by performing CFD simulations with dynamic-meshing of a moving manikin model. The manikin motion with and without swinging limbs was achieved by the re-meshing method to update the grid with each time step. The results focused on determining what discrepancies are produced in the flow field by a simplified geometry in the form of a cylinder, swinging limbs and thermal conditions; and whether such assumptions can be made for larger multi-body analysis. Using a cylinder showed differences in the velocity field behind the head and leg gap. The flow field between the rigid motion and swinging limb motion, showed significant discrepancies which corresponded to the gait phase. There were increased airflow disturbances at the hands and ankles (furthest body parts from the pivot point). The influence of thermal plume on the wake flow was minor during walking motion because of the walking speed of 1.2 m/s which dominated the buoyant thermal plume velocity. However, after the manikin stopped moving the thermal plume velocity became comparable to the residual wake.
HighlightsCFD with dynamic meshing was used to model rigid and swinging walking motion.The residual wake motion was visualised after walking finished.Energy modelling was included to investigate thermal plumes during walking.Airborne particle exposure can be affected by flow induced wake flows.
A numerical investigation of wind environment around a walking human body
AbstractHuman-induced wake flow characteristics and its interaction with thermal conditions was investigated by performing CFD simulations with dynamic-meshing of a moving manikin model. The manikin motion with and without swinging limbs was achieved by the re-meshing method to update the grid with each time step. The results focused on determining what discrepancies are produced in the flow field by a simplified geometry in the form of a cylinder, swinging limbs and thermal conditions; and whether such assumptions can be made for larger multi-body analysis. Using a cylinder showed differences in the velocity field behind the head and leg gap. The flow field between the rigid motion and swinging limb motion, showed significant discrepancies which corresponded to the gait phase. There were increased airflow disturbances at the hands and ankles (furthest body parts from the pivot point). The influence of thermal plume on the wake flow was minor during walking motion because of the walking speed of 1.2 m/s which dominated the buoyant thermal plume velocity. However, after the manikin stopped moving the thermal plume velocity became comparable to the residual wake.
HighlightsCFD with dynamic meshing was used to model rigid and swinging walking motion.The residual wake motion was visualised after walking finished.Energy modelling was included to investigate thermal plumes during walking.Airborne particle exposure can be affected by flow induced wake flows.
A numerical investigation of wind environment around a walking human body
Tao, Yao (author) / Inthavong, Kiao (author) / Tu, Jiyuan (author)
2017-05-05
11 pages
Article (Journal)
Electronic Resource
English
CFD analysis of wind environment around a human body
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