I have noticed that the “select alternate equilibrium” flag in SPMsim can produce some rather unusual results with exceptionally high forces. What is going on here?
From the on-line help for this flag: In some circumstances there exist two or more stable equilibrium vessel positions and orientations in the specified environment. These circumstances fall into two categories: (1) situations with crossed environmental conditions in which one of the stable equilibrium points is much more stable than the other(s) and (2) situations such as a tanker moored in a current-only or waves-only environment in which there are generally exactly *two* equally stable equilibria. In the first case, the simulation generally seeks and uses the most stable equilibrium. In the second case, with two physically equivalent equilibria, it has no way to choose one over the other and in fact just selects the first one it finds. Setting this flag will force the simulation to select an alternate equilibrium point. This is useful, for example, when simulating the equilibrium actually obtained in a model-test setup. When there exists a weak secondary equilibrium, SPMsim will fin
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