The simple strip theory does not result in good prediction of the motions of Surface effect ships. I want to know if there is a generalized strip theory or other procedure for prediction of the motions of surface effect ships(SES)?
Any suggestion is appreciated.
The air cushion shouldn't be modelled with strip theory. The sidehull hydrodynamics might be modelled with strip theory while a simple mathematical model for the air cushion dynamics (assuming uniform pressure in space) can be included in terms of two extra degrees of freedom (pressure and density) in the equations of motion. The most easily available write-up of this is found in Faltinsen "Hydrodynamics of High Speed Marine Vehicles" (2005), Cambridge Univ. Press.
The motion of a Surface Effect Ship (SES) is a very challenging Fluid Structure Interaction (FSI) problem. The challenge arises in modeling the complex interaction of the ship structure with surrounding fluid while maintaining a pressurized air cushion. The air cushion in the Surface Effect Ship (SES) can be modeled using a Finite Element method using an appropriate equation of state for the air domain (pressure density relationship). As Sverre Steen mentioned, the strip theory alone is not sufficient to capture the motion dynamics.
In the appendix, there are SES seakeeping results for strip theory and boundary-element methods for the following SES parameters.
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