Linear Stability Analysis and Validation of a Unified Solution Method for Fluid-structure-interaction on a Structural Dynamic Problem
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چکیده
In the conventional approach for fluid-structure interaction problems, the fluid and solid components are treated separately and information is exchanged across their interface. According to the conventional terminology, the current numerical methods can be grouped in two major categories: partitioned methods and monolithic methods. Both methods use two separate sets of equations for fluid and solid. A unified solution method has been presented in [1], which is different from these methods. The new approach treats both fluid and solid as a single continuum, thus the whole computational domain is treated as one entity discretised on a single grid. Its behavior is described by a single set of equations, which are solved fully implicitly. In this paper, two time marching and one spatial discretisation scheme, widely used for fluids equations, are applied for the solution of the equations for solids. Using linear stability analysis, the accuracy and dissipation characteristics of the resulting difference equations are examined. The aforementioned schemes are applied to a transient structural problem (beam bending) and the results compare favorably with available analytic solutions and are consistent with the conclusions of the stability analysis. A parametric investigation using different meshes, time steps and beam dimensions is also presented. For all cases examined the numerical solution was stable and robust and therefore is suitable for the next stage of application to full fluid-structure interaction problems.
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تاریخ انتشار 2006