Time Spectral Method for Rotorcraft Flow with Vorticity Confinement

This paper follows up on the authors’ recent paper. 1 It is shown here that it is possible to obtain reasonable improvement in the results utilizing Vorticity Confinement method. The previous paper has shown that using the Time Spectral method can increase convergence in forward flight calculations by up to two orders of magnitude compared to the traditional Backward Difference Formula (BDF). With the addition of a new boundary condition for the periodic planes, Euler and RANS forward flight calculations can now be done using only one sector of the blade, and thus further improve convergence by a factor of N for an N-bladed rotor,

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