MSE Special Seminar: Uncertainty quantification and sensitivity analysis applied to the computational fluid dynamics codes Nek5000 and Star-CCM+

Date/Time

03/19/2018
2:40 pm-4:00 pm
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Location

Rhines Hall, Room 125
549 Gale Lemerand Drive
Gainesville, FL 32611

Details

The presentation will focus on uncertainty quantification (UQ) and sensitivity analysis (SA) applied to two computational fluid dynamics (CFD) codes that are Nek5000 and Star-CCM+.

The first problem of interest is the simulation of a turbulent flow (Re = 31,000) in an infinite pipe with Nek5000. The objective of this study is to investigate the influence of the mesh, the polynomial order and the built-in filter on the numerical solution. A L2 error norm is computed from experimental data to quantify the effects of the above parameters on the numerical solution and assess the capabilities of Nek5000. Results show that the optimum use of Nek5000 is achieved with the combination of a curvilinear mesh, a coarse mesh and a high-polynomial order.

The second problem will address the modeling of the contact point in wire-wrapped pin bundles, and its effect on key parameters such as pressure drop and mixing parameters. The contact point is commonly modeled either by adding a gap between the wire and the next pin, or by embedding the wire in the next pin. This study attempts to determine the best approach to model the contact point, and to quantify its effect on key parameters.

For each project, an overview of the objectives, the current state of research, and future work or path forward if any, will be presented.

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