ACTA AERONAUTICAET ASTRONAUTICA SINICA >
A New Predefined Method of Particle Weight in DSMC Molecular Simulation
Received date: 2013-11-04
Revised date: 2014-02-10
Online published: 2014-03-05
For improving computation efficiency of the direct simulation Monte Carlo (DSMC) method and overcoming the difficulty of prior knowledge about particle weight before the starting of DSMC simulation, a new predefined solution method of the particle weight is introduced, which can be obtained by analyzing its definition and solution method in DSMC. Validity about this method is investigated by analyzing both flat plate and blunt cone flow fields. The results show that present method can solve the particle weight distribution characteristics before the starting of simulation. The number of simulated particles is distributed more uniformly in the whole flow field with this method when comparing it with the constant particle weight. The number of simulated molecules can also be reduced effectively without causing any accuracy loss. The method also can save internal storage and improve computation efficiency.
Key words： DSMC; unstructured grid; particle weight; rarefied gas; computation efficiency
HUANG Fei , SHEN Qing , CHENG Xiaoli , ZHAO Bo . A New Predefined Method of Particle Weight in DSMC Molecular Simulation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(8) : 2174 -2181 . DOI: 10.7527/S1000-6893.2013.0536
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