The Bi-model: Using CFD in simulations of slowly-inflating low-porosity hemispherical parachutes

摘要: The Bi-model aims at simulating the inflation of low-porosity, but apex-vented flat-circular canopies. most important feature model involves use CFD to obtain canopy drag data, internal flow data and apex vent in order inform parachute-payload’s trajectory equations canopy’s growth rates. As such this scheme goes half-way between high-order modeling FSI low-order modeling. But as further discussed here, is only applicable low-porosity hemispherical canopies that open slowly, i.e., where near-quasi steady state aerodynamics holds, during bubble stage USAF C-9 US Army T-10/G-12/G-11 families personnel cargo delivery parachutes used current military applications. also exploits unsteady character follows growth, namely Canopy Skirt Spreading stage, by using a full mass capture. latter has been shown work well for sequences which opening swift. Detailed comparisons are with collected on emergency parachute T-10 trooper parachute. . Nomenclature Abot = Bottom partition surface area Amouth mouth