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

Time-dependent viscosity implementation in fluent

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

LinkBack Thread Tools Display Modes
Old   January 27, 2010, 23:18
Default Time-dependent viscosity implementation in fluent
Senior Member
Real Name :)
Join Date: Jan 2010
Location: United States
Posts: 192
Rep Power: 10
ComputerGuy is on a distinguished road
Does anyone have an example (UDF/literature link?), or know if this is possible to do in fluent? Can one model thixotropy or rheopexy (rheopecty) in this program? I realize it will be a UDF implementation, but I'm unable to see how I would track parcels of fluid to monitor their shear rate vs. time, as thixotropic fluids have age-dependent viscosity.

Could this be implemented by injecting neutrally buoyant, very tiny particles and monitoring their shear vs time, and adjusting the viscosity of the fluid volume which contains them?

Thanks for you help.
ComputerGuy is offline   Reply With Quote

Old   April 19, 2010, 10:31
New Member
Join Date: Apr 2010
Posts: 1
Rep Power: 0
Agustin is on a distinguished road
You can use the croos model , if you know the coeficients of the equation, you can create a new component in Define-Materials and viscosity, you select the croos model and you only have to introduce the parameters of the model.
In the tutorial of fluent 2007, the tutorial number 8 talk about the non-Newtonian transitional flow in an eccentric annulus, you can find this in google.
I don't know if you ask about it, but it is the only thing that I know.

Sorry for open an old topic.
Agustin is offline   Reply With Quote

Old   September 20, 2011, 03:11
New Member
Join Date: Sep 2011
Posts: 8
Rep Power: 8
moisedion is on a distinguished road
I'm curious to know how you did solve this time dependent rheological Simulation... Was it by UDF or by creating a Solver in OpenFoam? Also, Cross Model is not for Time dependency but Shear Rate Dependency (thinning)...

Last edited by moisedion; September 23, 2011 at 05:00. Reason: Provide further details
moisedion is offline   Reply With Quote


thixotropic, time-dependent, udf, viscosity

Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Regarding Implementation of Hershel Bulkley Model in Viscosity correlation Pathak FLOW-3D 0 August 24, 2009 06:34
Time dependent gate opening krish FLUENT 0 June 17, 2007 01:17
residence time contour in Fluent kk FLUENT 0 May 1, 2007 22:56
unsteady calcs in FLUENT Sanjay Padhiar Main CFD Forum 1 March 31, 1999 12:32

All times are GMT -4. The time now is 06:36.