Based on GPU Computing, samadii/sciv (Statistical Contact in Vacuum) analyzes fluid behavior, deposition, and chemical reactions on rarefied gas flow regime, by using DSMC (Direct Simulation Monte Carlo) methods. In general continuum regime, solving Navier-Stokes equation is regarded as to analyze fluid behavior; but this assumption cannot be applied in rarefied gas regime. Because continuum fluid dynamics does not agree that liquid and gaseous substances are composed of molecules, but it regards its motion as a continuous fluid. Under continuum condition, viscosity coefficient represents momentum exchange with collision in a flow, because mean free path of the gas molecules is very short. On the other hand, in rarefied gas, the mean free path of the gas molecules is getting longer relatively. Thus, Navier-Stokes equations are meaningless without the characteristic of continuum. By replacing a large number of real molecules with representative particles (FN, 1011~1015), the DSMC method models physical phenomena that Boltzmann equation represents, with a probabilistic simulation. With these representative particles, physical phenomena such as Evaporation, deposition, and chemical reactions can be analyzed effectively with flow of the rarefied gas. Samadii/sciv can implement a variety of inlet and outlet conditions; and also it can be applied to the collisions on the wall surface, the deposition, the temperature conditions and various chemical reactions.
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