added coulon

assets/bib/coulon2023.bib

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+@article{COULON2023112933,
+title = {Direct numerical simulations of methane, ammonia-hydrogen and hydrogen turbulent premixed flames},
+journal = {Combustion and Flame},
+volume = {256},
+pages = {112933},
+year = {2023},
+issn = {0010-2180},
+doi = {https://doi.org/10.1016/j.combustflame.2023.112933},
+url = {https://www.sciencedirect.com/science/article/pii/S0010218023003140},
+author = {Victor Coulon and Jessica Gaucherand and Victor Xing and Davide Laera and Corentin Lapeyre and Thierry Poinsot},
+keywords = {DNS, Premixed, Hydrogen, Methane, Ammonia, Thermo-diffusive instability},
+abstract = {Three turbulent premixed flames with the same unstretched laminar flame speeds and thicknesses are analyzed and compared using 3D Direct Numerical Simulation (DNS) in a slot burner configuration at atmospheric conditions: a CH4/air flame at ϕ=1, an NH3−H2/air (46% vol. H2) at ϕ=1 and an H2/air flame at ϕ=0.45. While both stoichiometric methane and ammonia-hydrogen flames behave similarly, the lean hydrogen flame brush is twice as short with less flame surface, and exhibits significant alteration of its local flame structure: for the H2 flame, the thickness of flamelets decreases significantly while burning rates increase drastically. This is observed for flame elements convexly curved with respect to fresh reactants (positive curvature) because of preferential diffusion, where thermo-diffusive instabilities generate long-tail structures that continuously head toward the fresh gases, and also for near-flat flame elements because of local strain effects. Opposite behaviors are observed for flame elements concavely curved (negative curvature) where fuel depletion caused by unfocusing of hydrogen and strain effects are unable to increase the consumption, even leading to near-extinction of the flame. The turbulent methane and ammonia-hydrogen flames studied in this work do not exhibit the instabilities seen in the pure hydrogen flame. However, local flame-flame interactions are observed in the cusp regions of all three flames, which significantly increase the displacement speed as well as flame surface destruction. A 1D-3D comparison indicates that strain effects in regions of low curvature and preferential diffusion effects in regions of positive curvature can be modeled using counterflow flamelets to account for stretch effects on the turbulent hydrogen flame propagation in addition to turbulent wrinkling.}
+}

coulon.md

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+---
+layout: default
+title: Premixed Flame NH3-H2-Air
+description: NH3-H2-Air Premixed Flame DNS
+---
+
+<div style="text-align: center;">
+    <img src="/assets/img/coulon2023.jpg" alt="Image 1" style="max-width: 20%;">
+</div>
+# Description
+This DNS corresponds to a slot burner turbulent flame, where burnt gases at equilibrium surround a rectangular slot injecting fresh premixed gases. All calculations are performed with the compressible solver AVBP3 for solving the conservation of mass, momentum, energy and species equations. A third-order accurate in space and time Taylor-Galerkin finite-element scheme is used for the discretization of the convective terms, while a second-order Galerkin scheme is used for diffusion terms. Axial dimensions have been chosen using preliminary estimations of flame brush lengths to avoid interference with lateral boundaries, and to average in the transverse direction. A central jet injects a flow of fresh turbulent gases. Turbulence in this central jet is homogeneous and isotropic (HIT) with obtained by a synthetic generation method built from a Fourier series decomposition. Two slow laminar coflows of burnt gases are imposed on both sides of the central jet. Their composition corresponds to the burnt gas states of the central mixture. Ammonia-hydrogen/air mixtures are at stoichiometry whereas the. Simulations are initialized with burnt conditions inside the domain before beginning the injection of fresh gases at the inlet boundary. In the fresh-burnt transition region, species mass fraction and temperature profiles are set to follow the unstretched laminar flames profiles, and a smooth transition is enforced through a hyperbolic tangent function. The domain is periodic in the spanwise direction (z), no-slip conditions are specified in the crosswise direction (y) and static pressure is imposed at the outlet. Both inlet and outlet boundary conditions are treated with the Navier–Stokes Characteristic Boundary Conditions (NSCBC). 
+
+# Quick Info
+* <a href="https://www.kaggle.com/datasets/victorcoulon/premixed-flame-nh3-h2-dns-1">Kaggle Link</a>
+* Contributors:  Victor Coulon and Corentin Lapeyre
+* N<sub>x</sub> = 2191, N<sub>y</sub> = 627, N<sub>z</sub> = 314, N<sub>&#632;</sub> = 6 + 15
+* Size = 83 GB 
+* <a href="https://doi.org/10.1016/j.combustflame.2023.112933">DOI</a><BR>
+* <a href="./assets/bib/coulon2023.bib">.bib</a><BR>
+* <a href="./assets/json/coulon_info.json">info.json</a>

datasets.md

@@ -737,6 +737,10 @@ schemadotorg:
     <a href="/assets/img/shantanu2022.png" data-lightbox="gallery" data-title="Image 2"><img src="/assets/img/ico_shantanu2022.png" alt="Image 4"></a>
     <p><a href="shantanu.html"><BR><BR><BR><BR><BR>Incompressible HIT<BR>(1 Case)</a></p>
   </div>
+  <div class="gallery-item">
+    <a href="/assets/img/coulon2023.jpg" data-lightbox="gallery" data-title="Image 2"><img src="/assets/img/ico_coulon2023.png" alt="Image 4"></a>
+    <p><a href="coulon.html"><BR><BR><BR><BR><BR>NH3/H2/Air Premixed Flame<BR>(1 Case)</a></p>
+  </div>
 </div>
 
 # 2. BLASTNet Momentum128 3D SR Dataset