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Calculation of , and from a diameter and the reference velocity for a circular duct flow with smooth wall (use for inlet boundary conditions). More...
Public Member Functions | |
subroutine | turbulence_bc_ke_hyd_diam (uref2, dh, rho, mu, ustar2, k, eps) |
Calculation of , and from a diameter and the reference velocity for a circular duct flow with smooth wall (use for inlet boundary conditions).
Both and are returned, so that the user may compute other values of and with .
We use the laws from Idel'Cik, i.e. the head loss coefficient is defined by:
then the relation reads . depends on the hydraulic Reynolds number and is given by:
From , we can estimate and from the well known formulae of developped turbulence
[in] | uref2 | square of the reference flow velocity |
[in] | dh | hydraulic diameter |
[in] | rho | mass density |
[in] | mu | dynamic viscosity |
[out] | ustar2 | square of friction speed |
[out] | k | calculated turbulent intensity |
[out] | eps | calculated turbulent dissipation |
subroutine turbulence_bc_ke_hyd_diam | ( | real(c_double), value | uref2, |
real(c_double), value | dh, | ||
real(c_double), value | rho, | ||
real(c_double), value | mu, | ||
real(c_double) | ustar2, | ||
real(c_double) | k, | ||
real(c_double) | eps | ||
) |