DNS study of the bending effect due to smoothing mechanism
(2019) In Fluids 4(1).- Abstract
Propagation of either an infinitely thin interface or a reaction wave of a nonzero thickness in forced, constant-density, statistically stationary, homogeneous, isotropic turbulence is simulated by solving unsteady 3D Navier-Stokes equations and either a level set (G) or a reaction-diffusion equation, respectively, with all other things being equal. In the case of the interface, the fully developed bulk consumption velocity normalized using the laminar-wave speed S
L
depends linearly on the normalized rms velocity u ... (More)
(Less)
Propagation of either an infinitely thin interface or a reaction wave of a nonzero thickness in forced, constant-density, statistically stationary, homogeneous, isotropic turbulence is simulated by solving unsteady 3D Navier-Stokes equations and either a level set (G) or a reaction-diffusion equation, respectively, with all other things being equal. In the case of the interface, the fully developed bulk consumption velocity normalized using the laminar-wave speed S
L
depends linearly on the normalized rms velocity u
0
/S
L
. In the case of the reaction wave of a nonzero thickness, dependencies of the normalized bulk consumption velocity on u
0
/S
L
show bending, with the effect being increased by a ratio of the laminar-wave thickness to the turbulence length scale. The obtained bending effect is controlled by a decrease in the rate of an increase δA
F
in the reaction-zone-surface area with increasing u
0
/S
L
. In its turn, the bending of the δA
F
(u
0
/S
L
)-curves stems from inefficiency of small-scale turbulent eddies in wrinkling the reaction-zone surface, because such small-scale wrinkles characterized by a high local curvature are smoothed out by molecular transport within the reaction wave.
- author
- Yu, Rixin LU and Lipatnikov, Andrei N.
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Bending effect, Direct numerical simulations, Molecular transport, Reaction surface area, Reaction waves, Turbulent consumption velocity, Turbulent reacting flows
- in
- Fluids
- volume
- 4
- issue
- 1
- article number
- 31
- publisher
- MDPI AG
- external identifiers
-
- scopus:85063375172
- ISSN
- 2311-5521
- DOI
- 10.3390/fluids4010031
- language
- English
- LU publication?
- yes
- id
- 6a7fe18a-ab49-411c-8189-728fae148341
- date added to LUP
- 2019-04-08 11:07:15
- date last changed
- 2022-04-25 22:19:30
@article{6a7fe18a-ab49-411c-8189-728fae148341, abstract = {{<p><br> Propagation of either an infinitely thin interface or a reaction wave of a nonzero thickness in forced, constant-density, statistically stationary, homogeneous, isotropic turbulence is simulated by solving unsteady 3D Navier-Stokes equations and either a level set (G) or a reaction-diffusion equation, respectively, with all other things being equal. In the case of the interface, the fully developed bulk consumption velocity normalized using the laminar-wave speed S <br> <sub>L</sub><br> depends linearly on the normalized rms velocity u <br> <sup>0</sup><br> /S <br> <sub>L</sub><br> . In the case of the reaction wave of a nonzero thickness, dependencies of the normalized bulk consumption velocity on u <br> <sup>0</sup><br> /S <br> <sub>L</sub><br> show bending, with the effect being increased by a ratio of the laminar-wave thickness to the turbulence length scale. The obtained bending effect is controlled by a decrease in the rate of an increase δA <br> <sub>F</sub><br> in the reaction-zone-surface area with increasing u <br> <sup>0</sup><br> /S <br> <sub>L</sub><br> . In its turn, the bending of the δA <br> <sub>F</sub><br> (u <br> <sup>0</sup><br> /S <br> <sub>L</sub><br> )-curves stems from inefficiency of small-scale turbulent eddies in wrinkling the reaction-zone surface, because such small-scale wrinkles characterized by a high local curvature are smoothed out by molecular transport within the reaction wave. <br> </p>}}, author = {{Yu, Rixin and Lipatnikov, Andrei N.}}, issn = {{2311-5521}}, keywords = {{Bending effect; Direct numerical simulations; Molecular transport; Reaction surface area; Reaction waves; Turbulent consumption velocity; Turbulent reacting flows}}, language = {{eng}}, number = {{1}}, publisher = {{MDPI AG}}, series = {{Fluids}}, title = {{DNS study of the bending effect due to smoothing mechanism}}, url = {{http://dx.doi.org/10.3390/fluids4010031}}, doi = {{10.3390/fluids4010031}}, volume = {{4}}, year = {{2019}}, }