|
[Sponsors] |
![]() |
![]() |
#1 |
Guest
Posts: n/a
|
What is the formula to define the turbulence kinetic energy and turbulence dissipation rate? I am using the k-epsilon and VOF model? Thanks for any suggestion.
|
|
![]() |
![]() |
![]() |
#2 |
Guest
Posts: n/a
|
Hi,
a good guess is: k = 1.5 * (U * TI)^2 [m^2/s^2] eps = Cmu^0.75 * (k^1.5 / (0.07 * L)) [m^2/s^3] where U is the average (reference) velocity [m/s] TI is the turbulent intensity which depends on the case (e.g. = 0.10 means turbulence that velocity turbulent fluctuations have an aplitude which is 10% of the average velocity) Cmu = 0.09 is a constant L is a characteristic dimension which depends on the case (e.g. tube diameter) [m] I hope this helps. Cheers Maurizio |
|
![]() |
![]() |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
fluctuations in turbulence frequency and kinetic energy | rskrishna87 | CFX | 2 | June 11, 2011 15:45 |
【Discrete Phase Method】about the turbulence kinetic energy | charlesluan | FLUENT | 0 | April 22, 2010 07:21 |
ATTENTION! Reliability problems in CFX 5.7 | Joseph | CFX | 14 | April 20, 2010 15:45 |
Turbulence kinetic energy formula | ranjit | FLUENT | 1 | January 25, 2007 14:36 |
Turbulence kinetic energy transfer | Jun | FLUENT | 0 | April 11, 2006 23:52 |