A method based on the simple shear flow modified by the introduction of a deterministic non-conservative force and a stochastic process is proposed to measure the Navier–Stokes shear viscosity in a granular fluid described by the Enskog equation. The method is implemented in DSMC simulations for a wide range of values of dissipation and density. It is observed that, after a certain transient pe...

There are many flows fields that span a wide range of length scales where regions of both rarefied and continuum flow exist and neither direct simulation Monte Carlo (DSMC) nor computational fluid dynamics (CFD) provide the appropriate solution everywhere. Recently, a new viscous collision limited (VCL) DSMC technique was proposed to incorporate effects of physical diffusion into collision limi...

Abstract To overcome the defects of traditional rarefied numerical methods such as Direct Simulation Monte Carlo (DSMC) method and unified Boltzmann equation schemes extend covering range macroscopic equations in high Knudsen number flows, data-driven nonlinear constitutive relations (DNCR) are proposed first through machine learning method. Based on training data from both Navier-Stokes (NS) s...

Numerical simulations of hotwire anemometers in low-speed, high-altitude conditions have been carried out using the direct simulation Monte Carlo (DSMC) method. Hotwire instruments are commonly used for in-situ turbulence measurements because their ability to obtain high spatial and temporal resolution data. Fast time responses achieved by wires having small diameters (1–5 ?m). currently being ...

Abstract This paper is concerned with the Boltzmann equation based on a continuous internal energy variable to model polyatomic gases constant specific heats. We propose family of models for collision kernel and evaluate nonlinear operator get explicit expressions transport coefficients like shear bulk viscosities, thermal conductivity, depending parameters. shown contain as special case used i...

Cyber-physical systems (CPS) require model checking to guarantee the functional correctness of software models, providing counterexamples in case of violations. Domain-specific model checking (DSMC) allows to apply model checking to specific application domains. DSMC hides the complexity of using a model checker by translating from a domain-specific modeling language (DSML) to the model checker...

Freeze-drying is a low-pressure, low-temperature condensation pumping process widely used in the manufacture of pharmaceuticals for removal of solvents by sublimation. Key performance characteristics of a freezedryer condenser are largely dependent on the vapor and ice dynamics in the low-pressure environment. The main objective of this work is to develop a modeling and computational framework ...

The use of assistive devices to control the loss strength and range motion hemiplegic patients is becoming common. It difficult develop a precise approach for knee orthosis system because unpredictability dynamics unwanted subject’s spasm, jerk, vibration during gait assistance. In this study, an adaptive neuro-fuzzy inference (ANFIS) based on nonlinear disturbance observer (NDO) dynamic slidin...

This paper evaluates the suitability of a newly developed hybrid “Langmuir-Maxwell” and “LangmuirSmoluchowski” slip/jump boundary conditions in the Navier-Stokes-Fourier equations for nano/micro backward-facing step geometry flow which experiences separation and reattachment. Additionally, this paper investigates the effect of different parameters such as step pressure ratio, inflow temperature...