Simulation > Creo Flow Analysis > Preprocessing > Defining Physics > Turbulence > Definitions
Definitions
• Turbulent Energy Dissipation Rate—Independent variable used in the Turbulence model (m2/s3). Turbulent energy dissipation rate is a measure of the rate of dissipation of the turbulent kinetic energy:
where,
v'
turbulent fluctuation velocity
S'ij
strain tensor
u'ij
components of the turbulent fluctuation velocity
• Turbulent Kinetic Energy—Measure of the fluctuations of the mainstream kinetic energy (k m2/s2).
Standard Wall Function
where,
v'
turbulent fluctuation velocity
The above kinetic energy term is per unit mass (kg), and therefore is not technically an energy.
• Turbulent Kinetic Energy(Volume)—Sum of all the turbulent kinetic energy in a volume (k m2/s2). Turbulent kinetic energy is a measure of the fluctuations of the mainstream kinetic energy:
Standard Wall Function
v'
turbulent fluctuation velocity
The above kinetic energy term is per unit mass (kg), and therefore is not technically an energy.
• Turbulent Viscosity—Effective viscosity that affects turbulence (Pa-s).
Standard Wall Function
• Y Plus—Dimensionless wall distance. Y Plus is used in the Log Law of the Wall model.
Standard Wall Function
• Effective Viscosity—Effective dynamic viscosity (Poise or Pa-s) computed by the Turbulence module and used in place of the laminar viscosity in the Flow module formulation. Effective viscosity does not include the effects of vapor or aeration. Effective viscosity is assumed to be Newtonian, where shearing effects are not included.