Abstract
In this work, we study, from a probabilistic standpoint, the Riemann problem with uncertainties for the one-dimensional inviscid Burgers equation, which comes from the Navier-Stokes equations. We assume that the initial condition is formed by two random variables. The solution to the partial differential equation problem, which is explicitly constructed by grouping together rarefaction and shock waves, becomes a random field. At each space-time location, such solution is a mixed random variable, whose generalized probability density is obtained by using simple integration and a Dirac delta function. A key point of the contribution is that no assumption on statistical independence between the random initial conditions is imposed to obtain the probability density of the solution. In order to illustrate our theoretical findings, several computational examples are included. We validate our numerical results comparing the first moments (mean and variance), calculated from the probability density function of the solution, with the results obtained via Monte Carlo simulations. Numerical comparisons show full agreement.
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Acknowledgements
This work has been partially supported by the Spanish Ministerio de Economía, Industria y Competitividad (MINECO), the Agencia Estatal de Investigación (AEI) and Fondo Europeo de Desarrollo Regional (FEDER UE) grant MTM2017–89664–P. The author Marc Jornet has been supported by a postdoctoral contract from Universitat Jaume I, Spain (Acció 3.2 del Pla de Promoció de la Investigació de la Universitat Jaume I per a l’any 2020).
The authors would like to thank the reviewers and the editors for the revision of the chapter and the preparation of the book.
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Cortés, J.C., Jornet, M. (2022). Generalized Probability Density Function of the Solution to the Random Burgers-Riemann Problem. In: Zeidan, D., Merker, J., Da Silva, E.G., Zhang, L.T. (eds) Numerical Fluid Dynamics. Forum for Interdisciplinary Mathematics. Springer, Singapore. https://doi.org/10.1007/978-981-16-9665-7_2
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