Direct numerical simulations of autoignition in turbulent two-phase flows

2009 ◽  
Vol 32 (2) ◽  
pp. 2275-2282 ◽  
Author(s):  
P. Schroll ◽  
A.P. Wandel ◽  
R.S. Cant ◽  
E. Mastorakos
Keyword(s):  
Numerical Simulations ◽  
Direct Numerical Simulations ◽  
Two Phase Flows ◽  
Two Phase

Towards direct numerical simulations of low-Mach number turbulent reacting and two-phase flows using immersed boundaries

2016 ◽  
Vol 131 ◽  
pp. 123-141 ◽  
Author(s):  
Abouelmagd Abdelsamie ◽  
Gordon Fru ◽  
Timo Oster ◽  
Felix Dietzsch ◽  
Gábor Janiga ◽  
...  
Keyword(s):  
Mach Number ◽  
Numerical Simulations ◽  
Direct Numerical Simulations ◽  
Two Phase Flows ◽  
Two Phase ◽  
Low Mach Number ◽  
Immersed Boundaries

Modeling Wall Film Formation and Breakup Using an Integrated Interface-Tracking/Discrete-Phase Approach

2010 ◽  
Vol 133 (3) ◽  
Author(s):  
M. Arienti ◽  
L. Wang ◽  
M. Corn ◽  
X. Li ◽  
M. C. Soteriou ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Level Set ◽  
Film Formation ◽  
Rectangular Channel ◽  
Grid Method ◽  
Direct Numerical Simulations ◽  
Liquid Jet ◽  
Two Phase ◽  
Local Flow ◽  
Air Jet

We propose a computationally tractable model for film formation and breakup based on data from experiments and direct numerical simulations. This work is a natural continuation of previous studies where primary atomization was modeled based on local flow information from a relatively low-resolution tracking of the liquid interface [Arienti and Soteriou, 2007, “Dynamics of Pulsed Jet in Crossflow,” ASME Paper No. GT2007-27816]. The submodels for film formation proposed here are supported by direct numerical simulations obtained with the refined level set grid method [Herrmann, 2008, “A Balanced Force Refined Level Set Grid Method for Two-Phase Flows on Unstructured Flow Solver Grids,” J. Comput. Phys., 227, pp. 2674–2706]. The overall approach is validated by a carefully designed experiment [Shedd et. al., 2009, “Liquid Jet Breakup by an Impinging Air Jet,” Forty-Seventh AIAA Aerospace Sciences Meeting. Paper No. AIAA-2009-0998], where the liquid jet is crossflow-atomized in a rectangular channel so that a film forms on the wall opposite to the injection orifice. The film eventually breaks up at the downstream exit of the channel. Comparisons with phase Doppler particle analyzer data and with nonintrusive film thickness point measurements complete this study.

429 Numerical Simulations of Gas-Solid and Solid-Liquid Two Phase Flows by Using DEM

2008 ◽  
Vol 2008.21 (0) ◽  
pp. 500-501
Author(s):  
Mikio SAKAI ◽  
Yoshinori YAMADA ◽  
Yoshinori YAMADA ◽  
Seiichi KOSHIZUKA
Keyword(s):  
Numerical Simulations ◽  
Two Phase Flows ◽  
Two Phase ◽  
Solid Liquid

Numerical Simulation for Two-Phase Flows in Fuel Cell Minichannels

2011 ◽  
Vol 8 (4) ◽  
Author(s):  
Jean-Baptiste Dupont ◽  
Dominique Legendre ◽  
Anna Maria Morgante
Keyword(s):  
Fuel Cell ◽  
Numerical Simulations ◽  
Two Phase Flow ◽  
Numerical Code ◽  
Experimental Investigations ◽  
Pressure Jump ◽  
Phase Flow ◽  
Two Phase Flows ◽  
Two Phase ◽  
Flow Configurations

This work presents direct numerical simulations of two-phase flows in fuel cell minichannels. Different two-phase flow configurations can be observed in such minichannels, which depend on gas-flow rate, liquid holdup, and wettability of each wall. These flows are known to have a significant impact on the fuel cell’s performance. The different two-phase flow configurations must be studied specially concerning the prediction of the transition among them. In the fuel cell minichannels, experimental investigations are difficult to perform because of the small size of the device and the difficult control of the wettability properties of the walls. In such systems, numerical approach can provide useful information with a perfect control of the flow characteristics, particularly for the wettability aspect. The numerical code used in this study is the JADIM code developed at IMFT, which is based on a “volume of fluid” method for interface capturing without any interface reconstruction. The numerical description of the surface tension is one of the crucial points in studying such systems where capillary effects control the phase distribution. The static and the dynamics of the triple line between the liquid, the gas, and the wall is also an essential physical mechanism to consider. The numerical implementation of this model is validated in simple situations where analytical solutions are available for the shape and the pressure jump at the interface. In this paper we present the characteristics of the JADIM code and its potential for the studies of the fuel cell internal flows. Numerical simulations on the two-phase flows on walls, in corners, and inside channels are shown.

scholarly journals Direct numerical simulations of two-phase immiscible wakes

2014 ◽  
Vol 46 (4) ◽  
pp. 041409 ◽  
Author(s):  
Luca Biancofiore ◽  
François Gallaire ◽  
Patrice Laure ◽  
Elie Hachem
Keyword(s):  
Numerical Simulations ◽  
Direct Numerical Simulations ◽  
Two Phase

Detached direct numerical simulations of turbulent two-phase bubbly channel flow

2011 ◽  
Vol 37 (6) ◽  
pp. 647-659 ◽  
Author(s):  
Igor A. Bolotnov ◽  
Kenneth E. Jansen ◽  
Donald A. Drew ◽  
Assad A. Oberai ◽  
Richard T. Lahey ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Channel Flow ◽  
Direct Numerical Simulations ◽  
Two Phase
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