Collocation semi-discretizations based on Chan's SBP operator are equivalent to DG semi-discretizations on the same quadrature, with extraneous modes remaining zero.
Dubiner, Spectral methods on triangles and other domains, Journal of Scientific Computing 6 (4) (1991) 345–390
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Implicit velocity correction schemes extend the stable time step by up to two orders of magnitude and reduce overall time-to-solution by up to a factor of eleven for high-Re incompressible flow simulations, with only minor accuracy loss up to 20 times the explicit limit.
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Implicit Velocity Correction Schemes for Scale-Resolving Simulations of Incompressible Flow: Stability, Accuracy, and Performance
Implicit velocity correction schemes extend the stable time step by up to two orders of magnitude and reduce overall time-to-solution by up to a factor of eleven for high-Re incompressible flow simulations, with only minor accuracy loss up to 20 times the explicit limit.