Convergence to suitable weak solutions for a finite element approximation of the Navier-Stokes equations with numerical subgrid scale modeling
Provides theoretical justification for a class of numerical methods used in computational fluid dynamics, ensuring they produce physically relevant solutions.
This work proves that weak solutions from a variational multiscale finite element method for the Navier-Stokes equations are suitable in the sense of Scheffer, even when using equal-order velocity-pressure spaces that violate the inf-sup condition.
In this work we prove that weak solutions constructed by a variational multiscale method are suitable in the sense of Scheffer. In order to prove this result, we consider a subgrid model that enforces orthogonality between subgrid and finite element components. Further, the subgrid component must be tracked in time. Since this type of schemes introduce pressure stabilization, we have proved the result for equal-order velocity and pressure finite element spaces that do not satisfy a discrete inf-sup condition.