Numerical Simulation of Air Flow beneath a Rigid Body Falling on a Deformable Surface

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  • Numerical Simulation of Air Flow beneat

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In order to simulate a trapped-air impact due to slamming, as a first step of the study, a flow of the air layer beneath the bottom of a rigid body falling on a deformable surface is numerically analyzed. The air domain examined is two-dimensional and is extended far away from the bottom edge. The physical model of the air is that of compressible and inviscid gas. The Euler equations are written in generalized non-orthogonal curvilinear coordinates. This permits the bottom of the rigid body to have any deadrise angle or to be arbitrarily shaped ; the same holds for the surface beneath. The flow is computed by finite differences ; a strong conservation law form of the equations was used, which is capable of capturing the shock if present. To simulate the flow of the air layer whose height largely changes as the body falls down, a new mesh generation technique is proposed. The proposed algorithm may be also applied to other air-cushion related problems, such as a simulation of pressure control in the air-cushion chamber of SES.

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