This paper presents a dynamic sliding mode control (DSMC) for open-loop unstable chemical or biochemical processes with time delay. The controller is based on the and internal model concepts. proposed DSMC has an P/PD to provide systems disturbance rejection. An identification method approximates nonlinear process first-order delayed (FODUP). reduced-order model(FODUP) used synthesize new contr...

Simulations of nonequilibrium gas flows have garnered significant interest in modern engineering problems involving rarefied flow characteristics. Despite the popularity direct simulation Monte Carlo (DSMC) method simulating such flows, its use low-speed is limited by statistical noises. The information preservation (IP) a promising alternative known for low noise properties. In this study, new...

These lecture notes present the basic theory and methods for the Direct Simulation Monte Carlo (DSMC) algorithm. Some of the open challenges in the treatment of complex, multi-scale flows are also discussed.

Molecular dynamics and DSMC models for energy transfer in argon dimer argon monomer collisions are compared. The inelastic collision number for these collisions is evaluated, and found to decrease significantly when gas temperature increases.

Abstract The unified stochastic particle method based on the Bhatnagar-Gross-Krook model (USP-BGK) has been proposed recently to overcome low accuracy and efficiency of traditional methods, such as direct simulation Monte Carlo (DSMC) method, for multi-scale gas flows. However, running with extra virtual particles space interpolation, previous USP-BGK cannot be directly transplanted into existi...

In highly adaptive irregular problems such as many Particle-In-Cell (PIC) codes and Direct Simulation Monte Carlo (DSMC) codes, data access patterns may vary from time step to time step. This uctuation may hinder eecient utilization of distributed memory parallel computers because of the resulting overhead for data redistribution and dynamic load balancing. To eeciently parallelize such adap-ti...

Multiscale computational approach that combines different methods to study laser ablation phenomenon is presented. The methods include the molecular dynamics (MD) breathing sphere model for simulation of the initial stage of laser ablation, a combined MD finite element method (FEM) approach for simulation of propagation of the laser-induced pressure waves out from the MD computational cell, and...

A new Cartesian implementation of the direct simulation Monte Carlo (DSMC) method, named the hypersonic aerothermodynamics particle (HAP) code, is presented. This code is intended for rapid setup and simulation of rarefied flow problems, and as a framework for evaluating new physical models and numerical techniques. Unique features include the use of nonuniform Cartesian adaptive subcells, a co...

We present and discuss a particle simulation method for solving the Boltzmann equation which incorporates the variance reduction ideas presented in L. L. Baker and N. G. Hadjiconstantinou Physics of Fluids 17, 051703 2005 . The variance reduction, achieved by simulating only the deviation from equilibrium, results in a significant computational efficiency advantage for low speed flows compared ...