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The role of continuity in residual-based variational multiscale modeling of turbulence. (English) Zbl 1162.76355
Summary: This paper examines the role of continuity of the basis in the computation of turbulent flows. We compare standard finite elements and non-uniform rational B-splines (NURBS) discretizations that are employed in Isogeometric Analysis [T.J. R. Hughes et al., Comput. Methods Appl. Mech. Eng. 194, No. 39–41, 4135–4195 (2005; Zbl 1151.74419)]. We make use of quadratic discretizations that are $$C^{0}$$-continuous across element boundaries in standard finite elements, and $$C^{1}$$-continuous in the case of NURBS. The variational multiscale residual-based method is employed as a turbulence modeling technique. We find that $$C^{1}$$-continuous discretizations outperform their $$C^{0}$$-continuous counterparts on a per-degree-of-freedom basis. We also find that the effect of continuity is greater for higher Reynolds number flows.

##### MSC:
 76F65 Direct numerical and large eddy simulation of turbulence 76M10 Finite element methods applied to problems in fluid mechanics 76D05 Navier-Stokes equations for incompressible viscous fluids 76M30 Variational methods applied to problems in fluid mechanics
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