Comparison of one-dimensional turbulence and direct numerical simulations of soot formation and transport in a nonpremixed ethylene jet flame

2015 ◽  
Vol 35 (2) ◽  
pp. 1199-1206 ◽  
Author(s):  
David O. Lignell ◽  
Garrison C. Fredline ◽  
Adam D. Lewis
Keyword(s):  
Numerical Simulations ◽  
Soot Formation ◽  
Direct Numerical Simulations ◽  
Jet Flame ◽  
One Dimensional

STATIONARY LOCALIZED SOLUTIONS IN THE SUBCRITICAL COMPLEX GINZBURG–LANDAU EQUATION

2002 ◽  
Vol 12 (11) ◽  
pp. 2459-2465 ◽  
Author(s):  
O. DESCALZI ◽  
M. ARGENTINA ◽  
E. TIRAPEGUI
Keyword(s):  
Numerical Simulations ◽  
Landau Equation ◽  
Direct Numerical Simulations ◽  
Ginzburg Landau ◽  
Saddle Node Bifurcation ◽  
One Dimensional ◽  
Localized Solutions ◽  
Ginzburg Landau Equation ◽  
Complex Coefficients ◽  
Suitable Approximation

It is shown that pulses in the complete quintic one-dimensional Ginzburg–Landau equation with complex coefficients appear through a saddle-node bifurcation which is determined analytically through a suitable approximation of the explicit form of the pulses. The results are in excellent agreement with direct numerical simulations.

scholarly journals Magnetic helicity fluxes and their effect on stellar dynamos

2011 ◽  
Vol 7 (S286) ◽  
pp. 49-53
Author(s):  
Simon Candelaresi ◽  
Axel Brandenburg
Keyword(s):  
Numerical Simulations ◽  
Mean Field ◽  
Reynolds Numbers ◽  
Direct Numerical Simulations ◽  
Critical Values ◽  
Magnetic Helicity ◽  
Dynamic Quenching ◽  
Dynamo Action ◽  
One Dimensional ◽  
Field Formalism

AbstractMagnetic helicity fluxes in turbulently driven α2 dynamos are studied to demonstrate their ability to alleviate catastrophic quenching. A one-dimensional mean-field formalism is used to achieve magnetic Reynolds numbers of the order of 105. We study both diffusive magnetic helicity fluxes through the mid-plane as well as those resulting from the recently proposed alternate dynamic quenching formalism. By adding shear we make a parameter scan for the critical values of the shear and forcing parameters for which dynamo action occurs. For this αΩ dynamo we find that the preferred mode is antisymmetric about the mid-plane. This is also verified in 3-D direct numerical simulations.

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