number of reynolds and turbulence models

[alexmac]

Hi, everybody, I wanted to ask. .some could tell me from what number of reynolds onwards it is right to consider the turbulent flow in a cfd..io program I found that for re<10 000 it is possible to treat the laminar flow. is plausible? ?
another thing.. if I have to consider a motion of a non stationary fluid. When do I have to consider the average speed? ?

 

[Vash]

Hi.

I can help you in other fields not (for now).



See you soon.

 

[PLOTTER83]

Hello alexmac,
for re<2300 laminating motion
for 2300<re<3200 3200<re<10000="" di="" moto="" per="" re="" transizione="" turbolento="">10000 absolutely turbulent

see the moody diagram that is valid for all Newtonian fluids</re<3200>

 

[riccardot5765]

what plotter says is correct but you have to see if it suits your case. for example for flim falling on vertical walls you will have different values. you also need to consider any changes in fluid ownership.