نتایج جستجو برای: dsmc

تعداد نتایج: 520  

2018
Amir-Mehran Mahdavi Ehsan Roohi Craig White

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...

2006
Ye.A. Bondar M. S. Ivanov

Abstract. A new class of schemes of the DSMC type for computing near-continuum flows has been recently suggested: the time-relaxed Monte Carlo (TRMC) methods. An important step preceding the wide use of these schemes is their validation by classical homogeneous and one-dimensional problems of gas dynamics. For this purpose, a plane Couette flow is considered in the present paper. A comparison o...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده مکانیک 1392

در این مطالعه، میدان جریان مربوط به ایمپاکتور متقارن محوری در شرایط رقیق و در نسبت فشارهای مختلف مورد مطالعه قرار گرفته است. از روش شبیه سازی مستقیم مونت کارلو برای مدل کردن میدان جریان در اعداد نادسن 1/0، 01/0 و 0002/0 استفاده شده است. اعداد نادسن با استفاده از مقادیر فشار سکون در بالادست محاسبه شده اند. برای هر عدد نادسن، تاثیر مقادیر مختلف فاصله بین خروجی نازل و صفحه ایمپاکتور (l) و مقادیر م...

Journal: :Energies 2021

Sliding mode control strategies are well known for ensuring robustness of the system with respect to disturbance and model uncertainties. For continuous-time plants, they achieve this property by confining state a particular hyperplane in space. Contrary this, discrete-time sliding (DSMC) only drive representative point certain vicinity that hyperplane. In established literature on DSMC, width ...

2007
Wen-Lan Wang Quanhua Sun Iain D. Boyd

A preliminary hybrid particle-continuum computational framework for simulating hypersonic interacting flows is proposed. The framework consists of the direct simulation Monte Carlo-Information Preservation (DSMC-IP) method coupled with a Navier-Stokes solver. Since the DSMC-IP method provides the macroscopic information in each time step, determination of the continuum fluxes across the interfa...

Journal: :Journal of the Atomic Energy Society of Japan / Atomic Energy Society of Japan 1994

Journal: :Journal of the Korean Society of Propulsion Engineers 2014

2016
William B. Stein Alina A. Alexeenko

The Direct Simulation Monte Carlo (DSMC) method is used to numerically simulate and design a micronozzle with improved performance. Thrust calculations using the DSMC method demonstrate that the coaxial micronozzles can achieve milli-Newton thrust levels with specific impulses on the order of 45 s using argon in a cold gas expansion. Improved micronozzle designs of coaxial microthrusters are al...

2011
Jafar Keighobadi Mohammad Shahidi Sadeghi K. Alioghli Fazeli

In this paper, a Dynamic Sliding Mode Controller (DSMC) is proposed for trajectory tracking control of a nonholonomic Wheeled Mobile Robot (WMR) in which the centroid doesn't coincide to the connection center of driving wheels. This robust controller is designed based on the developed dynamical model of WMR in Cartesian coordinates, therefore, the application limits in polar coordinates is remo...

2006
S. K. Stefanov R. W. Barber M. Ota D. R. Emerson

In the present investigation, slip-continuum and molecular (DSMC) flow models have been used to compare the drag coefficient on a confined microsphere over a range of Knudsen numbers between 0.01 and 0.4. The simulations consider a fixed Reynolds number (Re=0.125) and a range of blockage ratios from 2.0 up to 13.0. Two separate problem formulations have been studied; the first considers flow pa...

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