CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Doubts on how to represent some terms for viscoelastic Flow Simulation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 4, 2009, 08:42
Default Hi everybody, I am currentl
  #1
Senior Member
 
Antonio Martins
Join Date: Mar 2009
Location: Porto, Porto, Portugal
Posts: 112
Rep Power: 8
titio is on a distinguished road
Send a message via MSN to titio Send a message via Skype™ to titio
Hi everybody,

I am currently trying to use OpenFoam to model the flow of incompressible viscoelastic fluids. Currently, I am doubts on how to implement two terms of the differential constitutive that I am using.

In particular, the equation has a term of the form
(1+A*tr(tensor))*tensor, where A is a constant and tensor represent the stress tensorial field. As the operation gives a tensor, I am considering it a source term when solving the equations to determine the extra stress. Can I do it this way?

Also in the calculation of the extra stress term, there is a term in the form div(U*tensor), the divergent of the velocity and the sress tensor. As the fluid is incompressible, I believe i can right the term in the form U*div(tensor), and represent it in OpenFoam language in the form div(phi,tensor), as it is equivalent to a flux term like U*div(U). Can I do this manipulations?

Antonio
titio is offline   Reply With Quote

Reply

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
VOF simulation of a viscoelastic fluid sinah OpenFOAM Running, Solving & CFD 10 November 25, 2010 12:02
Boundary Condition definition for Tensorial Fields and viscoelastic flow simulation titio OpenFOAM Running, Solving & CFD 1 February 4, 2009 10:14
Viscoelastic flow modeling in OpenFOAM vulda OpenFOAM Running, Solving & CFD 1 March 17, 2008 08:32
How to represent two phase flow in Gambit K.Baker FLUENT 4 May 22, 2006 08:03
Viscoelastic Flow in Fluent Edward Chan FLUENT 0 December 7, 2001 10:41


All times are GMT -4. The time now is 03:45.