  The numerical stability of fluid flow is an important topic in computational
fluid dynamics as fluid flow simulations usually become numerically unstable in
the turbulent regime. Many mesh-based methods have already established
numerical dissipation procedures that dampen the effects of the unstable
advection term. When it comes to meshless methods, the prominent stabilisation
scheme is hyperviscosity. It introduces numerical dissipation in the form of a
higher-order Laplacian operator. Many papers have already discussed the general
effects of hyperviscosity and its parameters. However, hyperviscosity in flow
problems has not yet been analyzed in depth. In this paper, we discuss the
effects of hyperviscosity on natural convection flow problems as we approach
the turbulent regime.
