## Research Abstracts Online

January 2009 - March 2010

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### University of Minnesota Twin Cities

Institute of Technology

Department of Mechanical Engineering

# PI: Richard J. Goldstein, Associate Fellow

### Modeling of Turbulent Gas Flows

These researchers are using MSI for two projects involving turbulent gas flows. Three-dimensional turbulent flows are widely observed in most flow configurations. As compared to two-dimensional turbulent flows, there are few studies related to these, mainly because of their inherent complexity. Previous work by this group has studied the effect of a moving belt on the heat transfer of the flow in different directions relative to the belt. They are currently modeling the heat transfer in a turbine cascade due to the relative motion between the stator and rotor sections. They have observed that flow transition to turbulence on the suction surface is effectively modeled by FLUENT.

Another project involves heat and mass transfer in separated flows, which are encountered in many engineering applications. Owing to its geometrical simplicity and basic features of separated flows, such as separation, reattachment, recirculation, and development of shear layers, the flow over a Backward Facing Step (BFS) has become a benchmark study in the analysis of separated flows. The researchers are creating two-dimensional numerical simulations in Fluent to estimate the reattachment length and arrive at an apparatus design, feasible within the laboratory constraints. Once the design has been formalized, three-dimensional simulations shall be carried out to have an estimate of the expected results. The experimental results shall then be compared with the three-dimensional numerical results to investigate the adequacy of the experimental apparatus for the simulation. It will also help identify any extraneous factors that might be affecting the results.

### Group Members

Federico Fassio, Visiting Researcher

Kalyanjit Ghosh, Graduate Student

Daniel Keene, Graduate Student

Yuli Kornblum, Collaborator

Kaustubh Kulkarni, Graduate Student

Rajat Mittal, Graduate Student

Vinod Srinivasan, Graduate Student

Matt Stinson, Graduate Student

Suofang Wang, Visiting Researcher