Turbulence Modeling
AcuSolve supports a variety of turbulence models for fluid flow simulations.
For steady state simulations the Reynolds-averaged Navier-Stokes equations are solved to arrive directly at the time averaged flow field. In case of transient simulations the governing equations are integrated in time to yield an accurate description of the flow field. There are also many different turbulence closure methods available for each type of simulation.
The various turbulence models used in AcuSolve are:
- One Equation and Two Equation Models
- Spalart-Allmaras (SA) turbulence model
- Detached Eddy Simulation (DES) Models
- SA – DES
- Large Eddy Simulation (LES) Models
- Classical (Smaroginsky) model
Turbulent Boundary Layer Modeling
AcuSolve also offers three approaches for the simulation of
turbulent boundary layer. These approaches involve setting the turbulence laws close to the
wall and are described as follows:
- Fully Resolved
- This approach integrates equations directly to the wall and uses near wall damping functions to produce appropriate behavior.
- Wall Function
- This approach uses a wall model based on the standard Law of the Wall for turbulent boundary layers.
- Running Average Wall Function
- This approach enforces the Law of the Wall on the running average flow field.
The wall functions used in AcuSolve are valid through the viscous sublayer and the buffer layer and have the advantage of having no lower bound limit. The upper bound limit for is 300.