We present and validate a variance reduced deviational particle method for simulating the Boltzmann transport equation for the variable hard sphere (VHS) collision operator. In comparison with the direct simulation Monte Carlo (DSMC) method, the proposed method is more suitable for simulating transport in regimes where the departure from equilibrium is small, such as dilute gas flows in small-s...

The ability to compute rarefied, ionized hypersonic flows is becoming more important as missions such as Earth reentry, landing high mass payloads on Mars, and the exploration of the outer planets and their satellites are being considered. These flows may also contain significant radiative heating. To prepare for these missions, NASA is developing the capability to simulate rarefied, ionized fl...

The computational cost of the direct simulation Monte Carlo solutions of rarefied flows increases with decreasing average flow velocity due to larger noise-to-signal ratio and a longer time to reach the steady state. For such low-speed flows, the discrete-ordinate solution of kinetic model equations can provide accurate and computationally efficient numerical modeling. In this work, analysis of...

A new variable exponential discrete-time sliding mode control (DSMC) reaching law is proposed to suppress the chattering phenomenon and accelerate speed for switching function. The consists of two-phase different term. main effect first phase reduce steps. second can decrease magnitude quasi-sliding-mode domain (QSMD). Otherwise, disturbance term restrained by order difference function which al...

A non-destructive, fast 2D profile monitor for an ion beam accelerator can be achieved by creating a high-density gas-sheet target in vacuum. It is known that gas flow through long rectangular channel with very small gap-to-width ratio effectual forming sheet. To obtain sheet the desired performance, spatial distribution of emitted molecules candidate should examined more detail. As part develo...

Simulating hypersonic flow around a space vehicle is challenging because of the multiscale and nonequilibrium nature inherent in these flows. To effectively deal with such flows, hybrid scheme combining stochastic particle Bhatnagar-Gross-Krook (BGK) method direct simulation Monte Carlo (DSMC) was developed recently, but only for monatomic gases (Fei et al. (2021) [29]). In this paper, particle...

Video super-resolution (VSR) aims at restoring a video in low-resolution (LR) and improving it to higher-resolution (HR). Due the characteristics of tasks, is very important that motion information among frames should be well concerned, summarized utilized for guidance VSR algorithm. Especially, when contains large motion, conventional methods easily bring incoherent results or artifacts. In th...

Linear stability analysis is performed using a combination of two-dimensional Direct Simulation Monte Carlo (DSMC) method for the computation basic state and solution pertinent eigenvalue problem, as applied to canonical boundary layer on semi-infinite flat plate. Three different gases are monitored, namely nitrogen, argon air, latter mixture 79\% Nitrogen 21\% Oxygen at range free-stream Mach ...

The direct simulation Monte Carlo (DSMC) method is used in a time-dependent manner to simulate threedimensional micro Couette flows. An artificial forcing that mimics the centrifugal force in the Taylor problem has been applied to the flow. The sampled behaviors of the resulting flow, including the averaged properties and disturbances, are studied. The computations have been performed using a p...