Abstract
Speed ensemble of bistable (combustion) fronts in mean zero stationary Gaussian shear flows inside two and three dimensional channels is studied with a min-max variational principle. In the small root mean square regime of shear flows, a new class of multi-scale test functions are found to yield speed asymptotics. The quadratic speed enhancement law holds with probability arbitrarily close to one under the almost sure continuity (dimension two) and mean square Holder regularity (dimension three) of the shear flows. Remarks are made on the conditions for the linear growth of front speed expectation in the large root mean square regime. Department of Mathematics, University of Texas at Austin, Austin, TX 78712 (jnolen@math.utexas.edu). Department of Mathematics and ICES (Institute of Computational Engineering and Sciences), University of Texas at Austin, Austin, TX 78712 (jxin@math.utexas.edu).
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