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dc.contributor.advisorPlatzer, Max F.
dc.contributor.authorCastro, Breno Moura
dc.dateSept 2001
dc.date.accessioned2012-08-22T15:29:51Z
dc.date.available2012-08-22T15:29:51Z
dc.date.issued2001-09
dc.identifier.urihttp://hdl.handle.net/10945/9726
dc.description.abstractA numerical investigation of unsteady wind tunnel and ground interference effects is carried out in the time domain to study the transonic flutter characteristics of the NLR 7301 section inside a wind tunnel and the thrust generation characteristics of a NACA 0014 airfoil plunging near a ground plane. A parallelized, multi-block, deforming grid, unsteady flow-solver is coupled with a two-degreeof- freedom structural model. For the transonic flutter problem, two types of porous-wall boundary-conditions are implemented and tested for the boundaries representing the tunnel walls. The type of porous boundary condition is found to influence significantly both steady and unsteady solutions. Results show that the free-flight flutter behavior may differ significantly from the behavior found in a porous wind tunnel because of the strong dependence on the tunnel porosity parameter and the proximity of the walls. An analysis of the trailing edge boundary condition is performed for the airfoil in ground effect. The computations show that this boundary condition influences the solution only when non-linearities are present in the flow-field, although parameters averaged through a cycle of oscillation are not affected significantly. The same behavior is observed for the influence of the turbulence model on the fully-turbulent, unsteady computations. However, the best agreement with low Reynolds number, experimental data is obtained when the flow is assumed laminar and no turbulence model is applied.en_US
dc.description.urihttp://archive.org/details/multiblockparall109459726
dc.format.extentxx, 128 p. ; 28 cm.en_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleMulti-block parallel Navier-Stokes simulation of unsteady wind tunnel and ground interference effectsen_US
dc.typeThesisen_US
dc.contributor.departmentAeronautical and Astronautical Engineering
etd.thesisdegree.namePh.D. in Aeronautical and Astronautical Engineeirngen_US
etd.thesisdegree.levelDoctoralen_US
etd.thesisdegree.disciplineAeronautical and Astronautical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate School (U.S.)en_US


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