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Comparison of Simulation Methods of Ion-Atomic Collisions in PIC-MC
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作者 Valeriy Sysun alexander Sysun +2 位作者 Vladimir Ignakhin Viktor Titov alexander tikhomirov 《Journal of Applied Mathematics and Physics》 2014年第13期1233-1241,共9页
The main ion-atomic collision treatment methods based on Monte-Carlo simulation are considered and discussed. We have proposed an efficient scheme for simulation of time between collisions taking into account cross-se... The main ion-atomic collision treatment methods based on Monte-Carlo simulation are considered and discussed. We have proposed an efficient scheme for simulation of time between collisions taking into account cross-section dependence on ion velocity and random generation of ion velocities and scattering angles after collisions. The developed algorithm of simulation of interval between collisions takes into account the change of relative velocity of ion-atom pair as well as the change of cross-section of collision and atomic concentration. At the same time, unlike the widely used “null-collision” method, both the probability of collision and change of particles’ state which determines this probability are taken into consideration for each particle independently in time. The simulation results according to the techniques proposed are found to be close to the theoretical values of ion drift velocities. It is revealed that the “null-collision” method results in exceeding of drift velocity in strong and intermediate fields. At the same time the proposed method of accumulation of probability under the same conditions gives values close to theoretical ones. In weak fields calculated values of drift velocity in both methods exceed theoretical values to some small extent. 展开更多
关键词 PIC-MC Simulation Ion-Atomic COLLISIONS DISCHARGE Plasma
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Production and characterization of bioaerosols for model validation in spacecraft environment
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作者 Anniina Salmela Eero Kokkonen +9 位作者 Ilpo Kulmala Anna-Maria Veijalainen Rob van Houdt Natalie Leys Audrey Berthier Ilyin Viacheslav Sergey Kharin Julia Morozova alexander tikhomirov Pertti Pasanen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第7期227-238,共12页
This study aimed to evaluate the suitability of two bioaerosol generation systems(dry and wet generation) for the aerosolization of microorganisms isolated from the International Space Station, and to calibrate the ... This study aimed to evaluate the suitability of two bioaerosol generation systems(dry and wet generation) for the aerosolization of microorganisms isolated from the International Space Station, and to calibrate the produced bioaerosols to fulfill the requirements of computational fluid dynamics model(CFD) validation. Concentration, stability, size distribution, agglomeration of generated bioaerosol and deposition of bioaerosols were analyzed. In addition, the dispersion of non-viable particles in the air was studied.Experiments proved that wet generation from microbial suspensions could be used for the production of well-calibrated and stabile bioaerosols for model validation. For the simulation of the natural release of fungal spores, a dry generation method should be used. This study showed that the used CFD model simulated the spread of non-viable particles fairly well. The mathematical deposition model by Lai and Nazaroff could be used to estimate the deposition velocities of bioaerosols on surfaces, although it somewhat underestimated the measured deposition velocities. 展开更多
关键词 BIOAEROSOL Modeling CFD SPACECRAFT FUNGI BACTERIA
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