H-Allegro - Revision history

Dangelo: /* Direct simulation of propagating flames: 3D expanding front (Eric Albin & Yves D'Angelo) */

2016-04-06T18:11:22Z

‎Direct simulation of propagating flames: 3D expanding front (Eric Albin & Yves D'Angelo)

Dangelo: /* No-slip wall acoustic boundary condition treatment in the incompressible limit : the NSWIL strategy (Marianne Cuif Sjöstrand & Yves D'Angelo) */

2016-04-06T18:10:19Z

‎No-slip wall acoustic boundary condition treatment in the incompressible limit : the NSWIL strategy (Marianne Cuif Sjöstrand & Yves D'Angelo)

Dangelo: /* DNS analysis of the non reactive & reactive flow inside a centimetric scale whirl flow combustor (M Cuif Sjöstrand, N Swaminathan & Y D'Angelo) */

2016-04-06T18:08:46Z

‎DNS analysis of the non reactive & reactive flow inside a centimetric scale whirl flow combustor (M Cuif Sjöstrand, N Swaminathan & Y D'Angelo)

Dangelo at 20:16, 5 April 2016

2016-04-05T20:16:24Z

Dangelo: /* DNS analysis of the non reactive & reactive flow inside a centimetric scale whirl flow combustor (Marianne Cuif Sjöstrand & Yves D'Angelo) */

2016-04-03T22:53:26Z

‎DNS analysis of the non reactive & reactive flow inside a centimetric scale whirl flow combustor (Marianne Cuif Sjöstrand & Yves D'Angelo)

Dangelo: /* External Links */

2016-04-03T20:50:17Z

‎External Links

Dangelo: /* External Links */

2016-04-03T20:49:20Z

‎External Links

Dangelo: /* Wet combustion analysis (Eric Albin, C O Pashereit & Yves D'Angelo) */

2016-04-03T14:47:01Z

‎Wet combustion analysis (Eric Albin, C O Pashereit & Yves D'Angelo)

Dangelo: /* Direct simulation of propagating flames: 3D expanding front (Eric Albin & Yves D'Angelo) */

2016-04-03T14:43:56Z

‎Direct simulation of propagating flames: 3D expanding front (Eric Albin & Yves D'Angelo)

Dangelo: /* External Links */

2016-04-02T14:38:47Z

‎External Links

@@ Line 29: / Line 29: @@
 We present a DNS of propane/air 3D expanding flame in a turbulent mixture, performed with the HALLEGRO solver.
-* Mesh 480 x480x480 (~110 million grid points) ; dx~60 <math>\mu</math>m; <math>\mu</math>, 3x3x3 cm<math>^3</math>
+* Mesh 480 x480x480 (~110 million grid points) ; dx~60 <math>\mu</math> m ;  3x3x3 cm<math>^3</math>
 * Initial Passot-Pouquet spectrum then cold flow DNS for obtaining decreasing turbulence
 * 512 proc, 70 000 CPU hours
@@ Line 53: / Line 53: @@
-* More details in E. Albin & Y. D’Angelo, Assessment of the Evolution Equation Modelling approach for three-dimensional expanding wrinkled premixed flames, Combustion & Flame, Vol. 159, Issue 5, pp 1932–1948, May 2012 http://dx.doi.org/10.1016/j.combustflame.2011.12.019
+* More details in E. Albin & Y. D’Angelo, Assessment of the Evolution Equation Modelling approach for three-dimensional expanding wrinkled premixed flames, Combustion & Flame, Vol. 159, Issue 5, pp 1932–1948, May 2012 [http://dx.doi.org/10.1016/j.combustflame.2011.12.019]
 ==  Wet combustion analysis (Eric Albin, C O Pashereit & [[User:Dangelo| Yves D'Angelo]])   ==

@@ Line 121: / Line 121: @@
 As an extension of the 3DNSCBC popular approach, this NSWIL strategy relaxes smoothly towards a 3DNSCBC strategy for a slipping wall – the Euler equations natural wall boundary condition – when the viscosity goes to zero.
 Using our in-house 6th order FD solver, some comparative tests were performed.
-In particular, we computed a pressure wave train in a 2D periodic channel, leading to standing acoustic waves. Long time runs using NSWIL strategy and involving 2.5 􏰈 10^5 temporal iterations and more than 2000 acoustic reflections at the walls show no numerical instability while popular NSCBC strategy turns out to be unstable after less than 100 reflections. In that case, global mass conservation was very precisely ensured using NSWIL (relative loss < 6.10^-5 after 2000 acoustic reflections) while NSCBC induced a global variation above 1% before code crashed.
+In particular, we computed a pressure wave train in a 2D periodic channel, leading to standing acoustic waves. Long time runs using NSWIL strategy and involving <math>2.5 \;10^5</math> temporal iterations and more than 2000 acoustic reflections at the walls show no numerical instability while popular NSCBC strategy turns out to be unstable after less than 100 reflections. In that case, global mass conservation was very precisely ensured using NSWIL (relative loss  <math>6.10^{-5}</math> after 2000 acoustic reflections) while NSCBC induced a global variation above 1% before code crashed.
 {| class="wikitable"
@@ Line 131: / Line 131: @@
 Right : Same computation at later acoustic times, for NSWIL and NSCBC strategies. Notice the oscillations close to the lower wall (figure (f), bottom right) for the NSCBC approach, at acoustic time t = 4L/c.
-*   More details on M. Sjostrand-Cuif, Y. D'Angelo & E. Albin, No-slip Wall Acoustic Boundary Condition treatment in the Incompressible Limit, Computers & Fluids, Volume 86, Pages 92–102, November 2013. http://dx.doi.org/10.1016/j.compfluid.2013.07.015
+*   More details on M. Sjostrand-Cuif, Y. D'Angelo & E. Albin, No-slip Wall Acoustic Boundary Condition treatment in the Incompressible Limit, Computers & Fluids, Volume 86, Pages 92–102, November 2013. [http://dx.doi.org/10.1016/j.compfluid.2013.07.015]
 ==  DNS analysis of the non reactive & reactive flow inside a centimetric scale whirl flow combustor (M Cuif Sjöstrand, N Swaminathan  & [[User:Dangelo| Y D'Angelo]])  ==

@@ Line 138: / Line 138: @@
-* A quasi–cubic 8×10×8 mm^3 air/methane non-premixed asymmetric combustion chamber is analyzed by means of direct numerical simulation. Three different cases with Reynolds numbers of 3380 and 4480 and global equivalence ratios of 0.77 and 1.027 were considered. Time-averaged and instantaneous flow dynamics are analyzed. A flame/turbulence interaction scenario can be proposed for this intermittently confined, low-turbulence combustive flow. In addition to the general turbulent flame features, unsteady or specific phenomena (such as interacting flames, ignition and extinction events, pockets of fresh gas burning into the hot core, and flame-relative thickening due to the small scale) were also observed. Available DNS data may be further exploited for RANS/LES SGS model benchmarking in this partially premixed small-scale combustion regime.
+* A quasi–cubic 8×10×8 <math>mm^3</math> air/methane non-premixed asymmetric combustion chamber is analyzed by means of direct numerical simulation. Three different cases with Reynolds numbers of 3380 and 4480 and global equivalence ratios of 0.77 and 1.027 were considered. Time-averaged and instantaneous flow dynamics are analyzed. A flame/turbulence interaction scenario can be proposed for this intermittently confined, low-turbulence combustive flow. In addition to the general turbulent flame features, unsteady or specific phenomena (such as interacting flames, ignition and extinction events, pockets of fresh gas burning into the hot core, and flame-relative thickening due to the small scale) were also observed. Available DNS data may be further exploited for RANS/LES SGS model benchmarking in this partially premixed small-scale combustion regime.
 * In addition to the expected result that increasing Reynolds numbers intensify turbulent structures, fuel/air mixing, and subsequent combustion, DNS results showed the following :
@@ Line 169: / Line 169: @@
 i) Turbulent area at the impact and along the air jet  ii) Ring shaped structures at the impact iii) Turbulent structures drop along the main jet of air.
 Right: Burning Case N°3, another view and another iso-reaction rate.
 ==  External Links ==
 See also the [http://www.dyco.fr DYCO Team] Main Page, [http://www.dyco.fr/index.php/User:Yd  Yves D'Angelo's] page at DYCO/LIED, the [http://www.dyco.fr/index.php/The_DYCO_Solver DYCO Solvers] and the  [http://www.dyco.fr/index.php/The_FLAMEX_Solver FLAMEX solver] web pages.

← Older revision		Revision as of 20:16, 5 April 2016
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	Right: Burning Case N°3, another view and another iso-reaction rate.		Right: Burning Case N°3, another view and another iso-reaction rate.

−	~~== External Links ==~~

		+
		+	== External Links ==
	See also the [http://www.dyco.fr DYCO Team] Main Page, [http://www.dyco.fr/index.php/User:Yd Yves D'Angelo's] page at DYCO/LIED, the [http://www.dyco.fr/index.php/The_DYCO_Solver DYCO Solvers] and the [http://www.dyco.fr/index.php/The_FLAMEX_Solver FLAMEX solver] web pages.		See also the [http://www.dyco.fr DYCO Team] Main Page, [http://www.dyco.fr/index.php/User:Yd Yves D'Angelo's] page at DYCO/LIED, the [http://www.dyco.fr/index.php/The_DYCO_Solver DYCO Solvers] and the [http://www.dyco.fr/index.php/The_FLAMEX_Solver FLAMEX solver] web pages.

@@ Line 133: / Line 133: @@
 *   More details on M. Sjostrand-Cuif, Y. D'Angelo & E. Albin, No-slip Wall Acoustic Boundary Condition treatment in the Incompressible Limit, Computers & Fluids, Volume 86, Pages 92–102, November 2013. http://dx.doi.org/10.1016/j.compfluid.2013.07.015
-==  DNS analysis of the non reactive & reactive flow inside a centimetric scale whirl flow combustor (Marianne Cuif Sjöstrand & [[User:Dangelo| Yves D'Angelo]])  ==
+==  DNS analysis of the non reactive & reactive flow inside a centimetric scale whirl flow combustor (M Cuif Sjöstrand, N Swaminathan  & [[User:Dangelo| Y D'Angelo]])  ==
@@ Line 169: / Line 169: @@
 i) Turbulent area at the impact and along the air jet  ii) Ring shaped structures at the impact iii) Turbulent structures drop along the main jet of air.
 Right: Burning Case N°3, another view and another iso-reaction rate.
 ==  External Links ==
 See also the [http://www.dyco.fr DYCO Team] Main Page, [http://www.dyco.fr/index.php/User:Yd  Yves D'Angelo's] page at DYCO/LIED, the [http://www.dyco.fr/index.php/The_DYCO_Solver DYCO Solvers] and the  [http://www.dyco.fr/index.php/The_FLAMEX_Solver FLAMEX solver] web pages.

← Older revision		Revision as of 20:50, 3 April 2016
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	== External Links ==		== External Links ==

−	See also the [http://www.dyco.fr DYCO Team], [http://www.dyco.fr/index.php/User:Yd Yves D'Angelo's] page at DYCO/LIED the [http://www.dyco.fr/index.php/The_DYCO_Solver DYCO Solvers] and the [http://www.dyco.fr/index.php/The_FLAMEX_Solver FLAMEX solver] web pages.	+	See also the [http://www.dyco.fr DYCO Team] Main Page, [http://www.dyco.fr/index.php/User:Yd Yves D'Angelo's] page at DYCO/LIED, the [http://www.dyco.fr/index.php/The_DYCO_Solver DYCO Solvers] and the [http://www.dyco.fr/index.php/The_FLAMEX_Solver FLAMEX solver] web pages.

← Older revision		Revision as of 20:49, 3 April 2016
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	== External Links ==		== External Links ==

−	See also the [http://www.dyco.fr DYCO Team], the [http://www.dyco.fr/index.php/The_DYCO_Solver DYCO Solvers] and the [http://www.dyco.fr/index.php/The_FLAMEX_Solver FLAMEX solver] web pages.	+	See also the [http://www.dyco.fr DYCO Team], [http://www.dyco.fr/index.php/User:Yd Yves D'Angelo's] page at DYCO/LIED the [http://www.dyco.fr/index.php/The_DYCO_Solver DYCO Solvers] and the [http://www.dyco.fr/index.php/The_FLAMEX_Solver FLAMEX solver] web pages.

@@ Line 61: / Line 61: @@
 Four different mixtures are used :<br />
-CH4/air φCH4 = 1 <br />
+Methane/air <math>\phi_{CH_4}</math> = 1 <br />
-CH4/air/steam  φCH4 = 1 <br />
+Metahne/air/steam <math>\phi_{CH_4}</math>= 1 <br />
-H2/air φH2 = 0.4 <br />
+H2/air <math>\phi_{H_3}</math>=  0.4 <br />
-H2/air/steam φH2 = 0.4 Ω = 0.0 Ω = 0.2 Ω = 0.0 Ω = 0.2<br />
+H2/air/steam <math>\phi_{H_2}</math>= 0,  Ω = 0.0 Ω = 0.2 Ω = 0.0 Ω = 0.2<br />
 • different flame configurations :
-laminar expansions (1.5cm)^3 <br />
+laminar expansions 1.5x1.5x1.5<math>cm^3</math> <br />
-laminar implosions (1.5cm)^3<br />
+laminar implosions 1.5x1.5x1.5<math>cm^3</math><br />
-turbulent expansions (1.8cm)^3<br />
+turbulent expansions 1.8x1.8x1.8<math>cm^3</math><br />
-turbulent implosions (1.5cm)^3<br />
+turbulent implosions 1.5x1.5x1.5<math>cm^3</math><br />
 → 20 simulations.<br />

← Older revision		Revision as of 14:38, 2 April 2016
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	== External Links ==		== External Links ==

−	See also the [[http://www.dyco.fr DYCO Team]], the [http://www.dyco.fr/index.php/The_DYCO_Solver DYCO Solvers] and the [http://www.dyco.fr/index.php/The_FLAMEX_Solver FLAMEX solver] web pages.	+	See also the [http://www.dyco.fr DYCO Team], the [http://www.dyco.fr/index.php/The_DYCO_Solver DYCO Solvers] and the [http://www.dyco.fr/index.php/The_FLAMEX_Solver FLAMEX solver] web pages.