Large-eddy simulation(LES) is applied to the problem of atmospheric dispersion around a normal plate for oncoming turbulence, which is time-sequentially generated by unsteady numerical simulation of spatially-developing boundary layer in the driver unit as another computational domain. The present numerical model is validated in comparison with the previous wind tunnel experimental data. Also, based on the computed data, we investigate turbulence and dispersion fields strongly influenced by complex dynamic behavior of separated shear layers and large eddies in the wake, and clarify physical mechanism of plume entrainment into the wake region of a normal plate.

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This paper deals with a study on calculating unsteady aerodynamic forces of a flat plate at torsional 1DOF oscillation for bridge deck section using computational fluid dynamics (CFD). The large eddy simulation (LES) with the Smagorinsky sub-grid scale (SGS) model is applied for the turbulent model. The IBTD/FS finite element formulation is applied for the methodology of the numerical flow simulation. For a treatment of the flow around an oscillating structure, the whole domain rigidly moves the same translational and rotational motions as the structural motions without any deformation of the finite element mesh. In order to confirm the effectiveness of present technique, the flow analyses around a flat plate (side ratio 150) with rotational forced motions were performed, and present results were compared with the theoretical solutions.

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