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Turbulent front speed in the Fisher equation: Dependence on Damkohler number
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy.
2011 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 83, no 1, 016304- p.Article in journal (Refereed) Published
Abstract [en]

Direct numerical simulations and mean-field theory are used to model reactive front propagation in a turbulent medium. In the mean-field approach, memory effects of turbulent diffusion are taken into account to estimate the front speed in cases in which the Damkohler number is large. This effect is found to saturate the front speed to values comparable with the speed of the turbulent motions. By comparing with direct numerical simulations, it is found that the effective correlation time is much shorter than for nonreacting flows. The nonlinearity of the reaction term is found to make the front speed slightly faster.

Place, publisher, year, edition, pages
2011. Vol. 83, no 1, 016304- p.
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:su:diva-67341DOI: 10.1103/PhysRevE.83.016304ISI: 000286756500006OAI: oai:DiVA.org:su-67341DiVA: diva2:470282
Note
authorCount :3Available from: 2011-12-28 Created: 2011-12-28 Last updated: 2017-12-08Bibliographically approved

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Brandenburg, Axel
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Nordic Institute for Theoretical Physics (Nordita)Department of Astronomy
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