CMS-Flow:Sediment Fall Velocity: Difference between revisions
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where: | where: | ||
v = kinematic viscosity [m<sup>2</sup>/s] | :v = kinematic viscosity [m<sup>2</sup>/s] | ||
d = grain size [m] | :d = grain size [m] | ||
d<sub>*</sub> = dimensionless grain size [-]. | :d<sub>*</sub> = dimensionless grain size [-]. | ||
Latest revision as of 19:55, 18 February 2015
Sediment Fall Velocity
The sediment fall velocity may be user-specified or is calculated using the formula by Soulsby (1997):
| (1) |
![{\displaystyle \omega _{s}={\frac {v}{d}}\left[(10.36^{2}+1.049d_{*}^{3})^{1/2}-10.36\right]}](https://en.wikipedia.org/api/rest_v1/media/math/render/svg/ed939dc3aa36d1e3685e246ed81c2bc76d29bf0b)
where:
- v = kinematic viscosity [m2/s]
- d = grain size [m]
- d* = dimensionless grain size [-].
The dimensionless grain size is given by
| (2) |
![{\displaystyle d_{*}=d\left[{\frac {(s-1)g}{v^{2}}}\right]^{1/3}}](https://en.wikipedia.org/api/rest_v1/media/math/render/svg/7a63b458b626aa8b1035c72b662531e7664257e4)
where:
s = sediment specific gravity or relative density [-]
g = gravitational constant (9.81 m/s2).
References
- Soulsby, R. L. 1997. Dynamics of marine sands. London, England: Thomas Telford Publications.