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<b><i>"Riding with Fuel: How Supernova Flames Preheat Their Surroundings"</i></b></div>
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<b>Tomasz Plewa</b></div>
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Department of Scientific Computing</div>
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Florida State University (FSU) </div>
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<i>NOTE: In-person attendance is requested in our 499 Dirac Science Library (DSL) Seminar Room. Zoom access is intended for external (non-departmental) participants only.</i></div>
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<b>https://fsu.zoom.us/j/94273595552</b></div>
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Meeting # <b>942 7359 5552</b></div>
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<b>Wednesday, Oct 21, 2026, Schedule:</b></div>
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<div role="presentation">3:00 to 3:30 PM Eastern Time (US and Canada)</div>
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<div role="presentation">โ Nespresso & Teatime - 417 DSL Commons</div>
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<div role="presentation"><b>3:30 to 4:30 PM Eastern Time (US and Canada)</b></div>
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<div role="presentation"><b>๐ Colloquium - 499 DSL Seminar Room</b></div>
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<b>Abstract:</b></div>
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Type Ia supernovae are thermonuclear explosions of white dwarfs. In the leading scenario, the explosion begins with a subsonic flame, or deflagration, whose buoyant rise drives turbulent motion and increasingly fine structure. Earlier simulations found a surprising
effect: fuel ahead of the flame can become much quicker to ignite than undisturbed fuel. This preconditioning may matter for whether a deflagration can later transition to a detonation, but its physical origin was unclear.</div>
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We investigate this effect by tracking millions of Lagrangian tracer particles through three-dimensional adaptive-mesh simulations at three fuel densities. The particle histories let us follow the thermodynamic changes experienced by individual parcels as they
approach the flame. We find that ignition time decreases as a power law of distance from the flame, with the fitted exponent steepening from about 0.7 at the lowest density to 3.4 at the highest. The reduction is accounted for almost entirely by fuel-temperature
increases of 13โ63% relative to unperturbed fuel.</div>
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We propose a two-step mechanism: thermal expansion of the flame first drives nearby fuel away from hydrostatic equilibrium. The fuelโs subsequent pressure adjustment, mediated by acoustic waves, redistributes internal energy toward the thermal component and
raises its temperature. Because nuclear burning is disabled in these simulations, they establish neither secondary ignition nor detonation. Burning-enabled simulations are the next step toward testing whether this preconditioning can help trigger either outcome.</div>
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Additional colloquium details can be found here:</div>
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<a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.sc.fsu.edu%2Fnews-and-events%2Fcolloquium%2Fcolloquium-with-tomasz-plewa-2026-10-21&data=05%7C02%7Csc-seminar-announce%40lists.fsu.edu%7C737c2bd24f3847b91bf808df2c8ffdf0%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639278669086910628%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=QsxoTPccw2%2B14%2F2jKZckBUg6n3EzycodQvyyUcTm3uw%3D&reserved=0" originalsrc="https://www.sc.fsu.edu/news-and-events/colloquium/colloquium-with-tomasz-plewa-2026-10-21">https://www.sc.fsu.edu/news-and-events/colloquium/colloquium-with-tomasz-plewa-2026-10-21</a></div>
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๐ฆ Colloquium recordings will be made available here:</div>
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