Abstract
In this paper, several commonly used vortex identification methods for marine hydrodynamics are revisited. In order to extract and analyse the vortical structures in marine hydrodynamics, the Q, λ2 — criterion and modified normalized Liutex/Rortex $$\it {\tilde\Omega_R}$$ method are utilized for vortex identification for propeller open water test, ship drag test, ship propeller-rudder interaction, VIV of a marine riser and VIM of a Spar platform. The limitation of Q and λ2 — criterion is discussed. The Liutex/Rortex $$\it {\tilde\Omega_R}$$ method is promising for convenient and accurate vortex identification and visualization. However, care should be taken when choosing the small parameter b0 for $$\it {\tilde\Omega_R}$$. We proposed recommended values of b0 for marine hydrodynamic problems.
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