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Research Abstracts Online
January 2008 - March 2009

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 used supercomputing resources for several projects during this period. In the first, they are studying three-dimensional turbulent flows, which are widely observed in most flow configurations. The researchers have used MSI to perform numerical simulations in Fluent to study the effect of a moving belt on the heat transfer for the following three cases: flow parallel to the belt; flow opposite to the belt; and flow transverse to the belt. The next step is to use the results from these studies to evaluate the heat transfer in a turbine cascade due to the relative motion between the stator and rotor endwall. The inlet skew increases the secondary losses in the cascade. Results from the simulation would be used to compare results from alternative mass transfer measurements.

The second project is a numerical study of heat and mass transfer analogy in separated flows, which are found 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 performing 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 can 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 would also help to identify any extraneous factors that might be affecting the results.

Other areas of interest include: the effect of relative motion between the stator and rotor in a gas turbine on endwall heat transfer; variable density shear flows; the phenomenon of suppression or delay of vortex shedding behind a circular cylinder; and simulations of a thermal field due to thermocouple probe measurements.

Group Members

Kalyanjit Ghosh, Graduate Student
Daniel Keene, Graduate Student
Kaustubh Kulkarni, Graduate Student
Rajat Mittal, Graduate Student
Vinod Srinivasan, Graduate Student
Federico Fassio, Visiting Researcher
Suofang Wang, Visiting Researcher
Yuli Kornblum, Collaborator