CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

3D CFD simulation of propeller blade - Turbulent viscosity limited to viscosity ratio

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   April 4, 2017, 06:18
Post 3D CFD simulation of propeller blade - Turbulent viscosity limited to viscosity ratio
New Member
Join Date: Mar 2017
Posts: 3
Rep Power: 8
Quentin_C is on a distinguished road
Hi everyone!

I’m a bit of a newbie in Fluent, but I decided for a project to simulate the performances of a propeller blade using moving reference frames and k-eps model. I’m trying to get a similar result from my experimental data but I have some errors messages showing up during the process. Namely ‘turbulent viscosity limited to viscosity ratio for x cells’ (x going up to 3e+9!) and / or ‘reverse flow on y faces on outflow’… I don’t know what could have gone wrong and would gladly share with you what you think

I’ve divided my problem as the geometry file show: 1 wall for my propeller, a cylindrical enclosure for my rotating part and a brick enclosure for my stationary domain. Tried to make the rotating part as near as possible of the propeller and keep sufficient distant between inlet and outflow. I have then 2 interfaces (see mesh part) and put the same size for the mesh elements. I then start the resolution of my problem. I put the rotating velocity I want for my rotating domain (6000rpm). Consider at the inlet a 0.1% turbulence intensity (I’ve read that this value is set based on the wind tunnel intensity experiment measures) and a turbulence Length Scale at 0.3m (not shown in photo) (considering this link Actually for my calculations I define and use k and epsilon using the same link (for my inlet) so k=0.015 et epsilon=7.547e-5.

For my reference values, I chose the data specific of my propeller (total area, length = diameter, enthalpy of air, basic pressure and velocity from inlet, affected to my rotating zone). Then I calculate with the value of time steps as shown as in the pictures… I have a converging solution (residuals continuity at e-4 and fluent says it’s converged) but I’ve got an enormous amount of cells with the turbulent viscosity error. My results seems good for the lift of the propeller if I take the values as soon as the solution converged and the amount of cells drops slowly as the calculation continues.

Do you think the mesh could be too much coarse? Should I keep the default reference values? How does this work for the solution? How should I define my turbulence parameters? Ever encountered this error? Can I consider my results good even with this message or should I let continue calculate until there is no cells left concerned? Thank you kindly if you share some of your ideas for I will gladly use some help ^^
Attached Images
File Type: jpg GEOMETRY.jpg (62.3 KB, 8 views)
File Type: jpg MESH1.jpg (115.7 KB, 8 views)
File Type: jpg INLET.jpg (90.2 KB, 9 views)
File Type: jpg SOLVER1.jpg (49.9 KB, 9 views)
File Type: jpg SOLVER5.jpg (132.8 KB, 8 views)
Quentin_C is offline   Reply With Quote


blade, performance, propeller, turbulent, viscosity ratio

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
reversed flow at pressure inlet and turbulent viscosity is limited.... cfdiscool FLUENT 10 June 10, 2015 07:15
v2f model - periodic boundaries - turbulent viscosity limited to viscosity ratio Davide_sd FLUENT 1 September 14, 2013 12:53
Turbulent Viscosity limited to viscosity ratio problem in pneumatic conveying shubham208011 Fluent Multiphase 0 June 26, 2013 04:46
Turbulent viscosity limited to viscosity ratio... Cyril FLUENT 8 February 7, 2006 21:34
limited turbulent viscosity ratio Volker Pawlik FLUENT 5 April 3, 2001 11:50

All times are GMT -4. The time now is 19:28.