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We apply retrospective cost model refinement to parameter estimation in a nonlinear partial differential equation. Specifically, for the scalar Burgers equation, we estimate the viscosity from measurements of flow velocity at a single grid point. We also consider the analogous problem for a modified Burgers equation as a proxy for a large eddy simulation to estimate a parameter that relates subgrid-scale...
We use retrospective cost adaptive control (RCAC) to control the thrust generated by a scramjet. A quasi-one-dimensional version of the mass, momentum, and energy conservation equations of compressible fluid flow with heat release is used to model the physics of the scramjet. First, we study the dynamic behavior of the scramjet model. Then, we apply system identification techniques to fit a linear...
Heterogeneous computers with processors and accelerators are becoming widespread in scientific computing. However, it is difficult to program hybrid architectures and there is no commonly accepted programming model. Ideally, applications should be written in a way that is portable to many platforms, but providing this portability for general programs is a hard problem. By restricting the class of...
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