Browsing by Author "Lo, Ming-Chung"

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Modelling Rarefied Hypersonic Reactive Flows Using the Direct Simulation Monte Carlo Method
(2015-10-01)
Lo, Ming-Chung
;
Su, Cheng-Chin
;
Wu, Jong-Shinn
;
Tseng, Kun-Chang
;
機械工程學系
This paper presents the implementation, validation and application of TCE (total collision energy) model for simulating hypersonic reactive flows in a parallel direct simulation Monte Carlo code, named PDSC++, using an unstructured grid. A series of benchmarking test cases, which include reproduction of theoretical rate constants in a single cell, 2D hypersonic flow past a cylinder and 2D-axisymmetric hypersonic flow past a sphere, were performed to validate the implementation. Finally, detailed aerothermodynamics of the flown reentry Apollo 6 Command Module at 105 km is simulated to demonstrate the powerful capability of the PDSC++ in treating realistic hypersonic reactive flow at high altitude.
Transport and Distribution of Hydroxyl Radicals and Oxygen Atoms from H2O Photodissociation in the Inner Coma of Comet 67P/Churyumov-Gerasimenko
(2016-03)
Lai, Ian-Lin
;
Su, Cheng-Chin
;
Ip, Wing-Huen
;
Wei, Chen-En
;
Wu, Jong-Shinn
With a combination of the Direct Simulation Monte Carlo (DSMC) calculation and test particle computation, the ballistic transport process of the hydroxyl radicals and oxygen atoms produced by photodissociation of water molecules in the coma of comet 67P/Churyumov-Gerasimenko is modelled. We discuss the key elements and essential features of such simulations which results can be compared with the remote-sensing and in situ measurements of cometary gas coma from the Rosetta mission at different orbital phases of this comet.