Unsteady RANS simulation of viscous nonlinear free surface flows

An unsteady, multiblock Reynolds-Averaged Navier-Stokes (RANS) method has been developed for time-domain simulation of arbitrary body motions with or without the presence of a free surface. The method was validated for a hydrofoil undergoing large-amplitude sinusoidal motion in an immersed fluid and a submerged hydrofoil moving beneath a free surface. A mixed Lagrangian-Eulerian approach was used to enable accurate tracking of the free surface waves. Solution-adaptive numerical grid was generated during each time step to conform with both the free surface and body boundaries. The numerical solutions successfully captured the viscous boundary layer and wake, the nonlinear free surface, and the interaction between the hydrofoil wake and nonlinear free surface.

Unsteady RANS simulation of viscous nonlinear free surface flows Conference Paper