Welcome, Guest
Username: Password: Remember me
Forgot your password? Forgot your username? Create an account
Forum
System Modules
TELEMAC-3D
Prandtl mixing length model
Flat Threaded

TOPIC: Prandtl mixing length model

Prandtl mixing length model 7 years 6 months ago #26316

  • Matta
  • Matta's Avatar
Hello,

I have a question about the mixing length model after Prandtl.
If this model is used as turbulent model in the vertical direction, the COEFFICIENT FOR VERTICAL DIFFUSION OF VELOCITIES should be given or is calculated by the model? Is not so clear to me

Thank you in advance

Regards
The administrator has disabled public write access.

Prandtl mixing length model 7 years 6 months ago #26317

  • konsonaut
  • konsonaut's Avatar
  • OFFLINE
  • openTELEMAC Guru
  • Posts: 413
  • Thank you received: 144
Hi,
the eddy viscosity along the vertical will be calculated. However, you can specify with COEFFICIENT FOR VERTICAL DIFFUSION OF VELOCITIES a minimum value of around 1.E-6 which is the kinematic viscosity of water.

Best regards,
Clemens
The administrator has disabled public write access.
The following user(s) said Thank You: Matta

Prandtl mixing length model 7 years 6 months ago #26338

  • jmhervouet
  • jmhervouet's Avatar
Hello,

Yes, for turbulence models which are not "constant viscosity", the value given for COEFFICIENT FOR VERTICAL DIFFUSION OF VELOCITIES must be taken equal to the kinematic viscosity, then the turbulent part computed by the model will be added.

With best regards,

Jean-Michel Hervouet
The administrator has disabled public write access.
Flat Threaded
Moderators: pham
Forum
System Modules
TELEMAC-3D
Prandtl mixing length model

The open TELEMAC-MASCARET template for Joomla!2.5, the HTML 4 version.