Calculation of fluid-structural interaction using fully coupled fluid-structural interaction model

The goal of this research it to develop high fidelity high efficiency fluid-structural interaction predicting capability based on fully coupled model. Fluid-structural interactions occur almost ever where in our daily life. For example, when a gust of wind blows a bridge, the bridge may vibrate due to the dynamic wind force. On a jet airplane, you may notice that the wings may vibrate due to the incoming flow. When the wind perturbation frequency is close to the inherent structure frequency, a dangerous phenomenon called "flutter" may happen. In an aircraft design, the flutter should be avoided.

In our research, a numerical methodology with fully coupled fluid-structural interaction for predicating 3-D transonic wing flutter has been developed. A dual-time step implicit unfactored Gauss-Seidel iteration with the Roe scheme and the low diffusion E-CUSP scheme we developed are employed in the flow solver. A modal approach structure solver is used to simulate the wing's response. An efficient mesh-deformation strategy based on an algebraic method is developed and is shown to be accurate and robust. The flow and structure solvers are fully coupled via successive iterations within each physical time step. The accuracy of the modal approach has been verified by using the finite element solver ANSYS. The computed flutter boundary of AGARD wing 445.6 for free stream Mach numbers ranging from 0.499 to 1.141 compares well with the experimental data. The sonic dip is very well captured.

The work with high order numerical scheme and advanced turbulence modeling for fluid-structural interaction is in progress.

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Journal Publications: