DSMC method on aerodynamic heating and temperature characteristic of hypersonic rarefied flows

2016 ◽  
Author(s):  
Jing Ma ◽  
Xingdong Bao ◽  
Hongxia Mao ◽  
Yanbing Dong
Keyword(s):  
Temperature Characteristic ◽  
Aerodynamic Heating ◽  
Dsmc Method ◽  
Rarefied Flows

DSMC Simulation of Low Knudsen Micro/Nanoflows Using Small Number of Particles per Cells

2013 ◽  
Vol 135 (10) ◽  
Author(s):  
Ali Amiri-Jaghargh ◽  
Ehsan Roohi ◽  
Hamid Niazmand ◽  
Stefan Stefanov
Keyword(s):  
Direct Simulation Monte Carlo ◽  
Velocity Slip ◽  
Heat Fluxes ◽  
Dsmc Method ◽  
Suitable Alternative ◽  
Low Speed ◽  
Rarefied Flows ◽  
Dsmc Simulation ◽  
Grid Scheme ◽  
Number Of Particles

Direct simulation Monte Carlo (DSMC) method in low Knudsen rarefied flows at micro/nanoscales remains a big challenge for researchers due to large computational requirements. In this article, the application of the simplified Bernoulli-trials (SBT)/dual grid collision scheme is extended for solving low Knudsen/low speed and low Knudsen/high gradient rarefied micro/nanoflows. The main advantage of the SBT algorithm is to provide accurate calculations using much smaller number of particles per cell, i.e., 〈N〉 ≈ 2, which is quite beneficial for near continuum DSMC simulations where the requirement of fine meshes faces the simulation with serious memory restrictions. Comparing the results of the SBT/dual grid scheme with the no time counter (NTC) scheme and majorant frequency scheme (MFS), it is shown that the SBT/dual grid scheme could successfully predict the thermal pattern and hydrodynamics field as well as surface parameters such as velocity slip, temperature jump and wall heat fluxes. Therefore, we present SBT/dual grid algorithm as a suitable alternative of the standard collision schemes in the DSMC method for typical micro/nanoflows solution. Nonlinear flux-corrected transport (FCT) algorithm is also employed as a filter to extract the smooth solution from the noisy DSMC calculation for low speed/low Knudsen number DSMC calculations.

Analysis on High Temperature Characteristic of High Power Semiconductor Laser Array

2020 ◽  
Vol 41 (9) ◽  
pp. 1158-1164
Author(s):  
Bo LI ◽  
◽  
Zhen-fu WANG ◽  
Bo-cang QIU ◽  
Guo-wen YANG ◽  
...  
Keyword(s):  
High Temperature ◽  
Semiconductor Laser ◽  
High Power ◽  
Temperature Characteristic ◽  
Laser Array ◽  
Power Semiconductor
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