- **Main CFD Forum**
(*https://www.cfd-online.com/Forums/main/*)

- - **Log law for unsteady velocity profile**
(*https://www.cfd-online.com/Forums/main/104507-log-law-unsteady-velocity-profile.html*)

Log law for unsteady velocity profileHi
I want to simulate the unsteady wind flow over a house. For steady simulation I use Log law velocity profile but I couldn`t find a formula for the Unsteady simulation where the wind speed is changes with time. so I wonder what is the formula for such problem ? |

Quote:
no analytical law exists for unsteady turbulent velocity, the log-law has statistical meaning for a flow in energy equilibrium (production=dissipation) such that the time derivative statistically vanishes. If you have a flow that increases in time I suggest using LES with a grid resolving the boundary layer, however this is computational expensive. |

All times are GMT -4. The time now is 18:54. |