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- W1936706049 abstract "Abstract : In this work a structured adaptive mesh re refinement (S-AMR) strategy for fluid-structure interaction (FSI) problems in laminar and turbulent incompressible flows is developed. The Eulerian computational grid consists of nested grid blocks at di different re refinement levels. The grid topology and data-structure is managed by using the Paramesh toolkit. The filtered Navier-Stokes equations are evolved in time by means of an explicit second-order projection scheme, where spatial derivatives are approximated with second order central di differences on a staggered grid. The level of accuracy of the required variable interpolation operators is studied, and a novel divergence-preserving prolongation scheme for velocities is evolved. A novel direct forcing embedded-boundary method is developed to enforce boundary conditions on a complex moving body not aligned with the grid lines. In this method, the imposition of no-slip conditions on immersed bodies is done on the Lagrangian markers that represent their wet surfaces, and the resulting force is transferred to the surrounding Eulerian grid points by a moving least squares formulation. Extensive testing and validation of the resulting strategy is done on a numerous set of problems. For transitional and turbulent ow regimes the large-eddy simulation (LES approach is used. The grid discontinuities introduced in AMR methods lead to numerical errors in LES, especially if non-dissipative, centered schemes are used. A simple strategy is developed to vary the filter size for filtered variables around grid discontinuities. A strategy based on explicit filtering of the advective term is chosen to e effectively reduce the numerical errors across re refinement jumps." @default.
- W1936706049 created "2016-06-24" @default.
- W1936706049 creator A5038770393 @default.
- W1936706049 date "2010-01-01" @default.
- W1936706049 modified "2023-09-27" @default.
- W1936706049 title "A Fluid Structure Interaction Strategy with Application to Low Reynolds Number Flapping Flight" @default.
- W1936706049 hasPublicationYear "2010" @default.
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