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Author Hubbard, Bryan John
Title A chimera RANS method for steady and unsteady incompressible viscous fluid flows
Descript 181 p
Note Source: Dissertation Abstracts International, Volume: 56-02, Section: B, page: 0979
Chair: Hamn Ching Chen
Thesis (Ph.D.)--Texas A&M University, 1994
This dissertation presents a new method for calculating incompressible viscous flows around complex configurations using a multiblock Reynolds Averaged Navier Stokes (RANS) solver and a chimera method. The chimera method is used to connect embedded or patched grids together by interpolating information across the grid boundaries. This technique has been found to be a useful tool for simplifying the grid generation process for complex configurations and has proven to be an effective means of refining grids in areas of high gradients. Furthermore, the chimera method is useful for analyzing configurations that have relative motion between components
When using the original chimera technique for incompressible flows that incorporate some type of iterative pressure/velocity coupling scheme, errors resulted along the interpolated boundary. These errors were caused by an inability to maintain continuity of the flow variables across the linking boundary. A new grid interface conservation technique was developed to eliminate these errors and ensure a smooth solution across the linking boundaries
After the chimera method was implemented into the RANS solver, several computational studies were carried out to test the accuracy of the method. The validations were done under a variety of conditions, and encompassed a number of different configurations. The primary purpose of the validations was to determine the effectiveness of the conservation technique for grid interfaces. Moreover, the flexibility of the chimera method allowed other aspects of the code to also be tested, including unsteady flow conditions, moving boundary conditions, and advanced turbulence models. Four configurations were tested: a stationary and oscillating cylinder, a submarine with a ring wing attached to the stern, and a wing mounted on a flat plate
Results for all the configurations show the chimera RANS method is very effective in determining flow behavior for incompressible viscous flows. In all instances, results using the new grid interface conservation technique provided a smooth and consistent solution across the linking boundaries. Results from the different configurations also compared well with experimental results. The chimera RANS method developed is a flexible and powerful tool that will be beneficial to both research and design engineering applications
School code: 0803
Host Item Dissertation Abstracts International 56-02B
Subject Engineering, Civil
Engineering, Mechanical
Alt Author Texas A&M University
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