Simulating the Flow and Soot Loading in Wall- Flow DPF Using a Two-Dimensional Mesoscopic Model

2018 ◽  
Author(s):  
Xiangjin Kong ◽  
Zhijun Li ◽  
Xingyu Liang ◽  
Boxi Shen ◽  
Li He ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Mesoscopic Model ◽  
Soot Loading ◽  
Wall Flow

Flows of thin streams with free boundaries

1973 ◽  
Vol 59 (3) ◽  
pp. 417-432 ◽  
Author(s):  
Joseph B. Keller ◽  
James Geer
Keyword(s):  
Channel Flow ◽  
Potential Flow ◽  
Slenderness Ratio ◽  
Asymptotic Series ◽  
Two Dimensional ◽  
Free Boundaries ◽  
Complex Flow ◽  
Flow Problems ◽  
Different Types ◽  
Wall Flow

A method is developed for determining any thin steady two-dimensional potential flow with free and/or rigid boundaries in the presence of gravity. The flow is divided into a number of parts and in each part the flow and its free boundaries are represented as asymptotic series in powers of the slenderness ratio of the stream. There are three basic flows, having two, one and no free boundaries and called jet flow, wall flow and channel flow, respectively. First the three expansions for these flows are found, extending results of Keller & Weitz (1952). They are called outer expansions to distinguish them from the inner expansions which apply near the ends of the stream or at the junction of two different types of flow. The inner and outer expansions must be matched at a junction to find how the emerging flow is related to the entering flow. This process can be continued to build up any complex flow involving thin streams. The method is illustrated in the case of a wall flow that leaves the wall to become a jet, which includes the case of a waterfall treated by Clarke (1965) in a similar way. In part 2 (to be published) other inner expansions are found and matched to outer expansions, providing the ingredients for the construction of the solutions of many flow problems.

The Thermal Boundary Layer Far Downstream of a Spanwise Line Source of Heat

1980 ◽  
Vol 102 (4) ◽  
pp. 755-760 ◽  
Author(s):  
J. Andreopoulos ◽  
P. Bradshaw
Keyword(s):  
Temperature Fluctuation ◽  
Outer Part ◽  
Heated Wall ◽  
Two Dimensional ◽  
Turbulent Prandtl Number ◽  
Dimensional Boundary ◽  
Wall Flow ◽  
The Mean ◽  
Thermal Layer ◽  
Point Source Of Heat

Measurements are presented of velocity and temperature fluctuation statistics in two-dimensional boundary layers over nominally adiabatic, smooth, and rough surfaces far downstream of spanwise line sources of heat. All quantities are found to scale satisfactorily on uτ, δ and ΔTmax. The generation term in the transport equation for the mean-square temperature fluctuation reaches a maximum at a distance of about 0.7δ above the surface and the turbulent Prandtl number is about 1.0 in the outer layer falling to zero near the surface. The outer part of the thermal layer behaves like a uniformly heated wall flow and the results are relevant to the central region of the plume from a point source of heat or pollutants, which will be approximately two-dimensional at large distances from the source.

MAGNETO-STRUCTURAL TRANSITIONS: MOLECULAR DYNAMICS SIMULATIONS OF A UNITED-ATOM, MESOSCOPIC MODEL

2013 ◽  
Vol 27 (07) ◽  
pp. 1350047
Author(s):  
JAYEE BHATTACHARYA ◽  
VIJAY SINGH ◽  
SURAJIT SENGUPTA ◽  
INDRA DASGUPTA
Keyword(s):  
Molecular Dynamics ◽  
Phase Diagram ◽  
Molecular Dynamics Simulations ◽  
Structural Transition ◽  
Spin Dynamics ◽  
Heusler Alloys ◽  
Exchange Interactions ◽  
Two Dimensional ◽  
Mesoscopic Model ◽  
Dynamics Simulations

In this paper, we perform hybrid Langevin and molecular dynamics simulations on a two-dimensional, united-atom, mesoscopic model to obtain the phase diagram for a solid undergoing a magneto-structural transition. The interatomic exchange interactions are inspired by ab initio calculations in the Ni 2 MnGa system. The spins are updated with the help of Langevin soft spin dynamics. The nature of the phase diagram obtained from our simulations is similar to that obtained experimentally in Ni 2+x Mn 1-x Ga Heusler alloys showing magnetic and martensitic transitions with excess Ni stoichiometry viz. x.

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