A roughness-dependent model
From CFD-Wiki
Contents |
Two-equation eddy viscosity model
![]() | (1) |
where:
One-equation eddy viscosity model
![]() | (2) |
Algebraic eddy viscosity model
![]() | (3) |
is the mixing length.
Algebraic model for the turbulent kinetic Energy
![]() | (4) |
is the shear velocity and
a model parameter.
Algebraic model for the mixing length, based on (4) [Absi (2006)]
![]() | (5) |
,
is the hydrodynamic roughness
the algebraic eddy viscosity model is therefore
![]() | (6) |
for a smooth wall ():
![]() | (6) |
References
- Absi, R. (2006), "A roughness and time dependent mixing length equation", Journal of Hydraulic, Coastal and Environmental Engineering, Japan Society of Civil Engineers, (Doboku Gakkai Ronbunshuu B), Vol. 62, No. 4, pp.437-446.