Volume 52, Number 5, September–October 2018
|Page(s)||1651 - 1678|
|Published online||22 November 2018|
Uniform regularity in the random space and spectral accuracy of the stochastic Galerkin method for a kinetic-fluid two-phase flow model with random initial inputs in the light particle regime★
School of Mathematical Sciences, Institute of Natural Sciences, MOE-LSEC and SHL-MAC, Shanghai Jiao Tong University,
2 Department of Mathematics, University of Wisconsin-Madison, Madison, WI 53706, USA.
* Corresponding author: firstname.lastname@example.org
Accepted: 16 April 2018
We consider a kinetic-fluid model with random initial inputs which describes disperse two-phase flows. In the light particle regime, using energy estimates, we prove the uniform regularity in the random space of the model for random initial data near the global equilibrium in some suitable Sobolev spaces, with the randomness in the initial particle distribution and fluid velocity. By hypocoercivity arguments, we prove that the energy decays exponentially in time, which means that the long time behavior of the solution is insensitive to such randomness in the initial data. Then we consider the generalized polynomial chaos stochastic Galerkin method (gPC-sG) for the same model. For initial data near the global equilibrium and smooth enough in the physical and random spaces, we prove that the gPC-sG method has spectral accuracy, uniformly in time and the Knudsen number, and the error decays exponentially in time.
Mathematics Subject Classification: 35Q35 / 65L60
Key words: Two-phase flow / kinetic theory / uncertainty quantification / stochastic Galerkin method / hypocoercivity
© EDP Sciences, SMAI 2018
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